Chan Byon

Ulsan National Institute of Science and Technology | UNIST · Department of Mechanical System Design and Manufacturing

This study describes the thermal conductivity (TC) enhancement of polymer composites with randomly distributed hybrid fillers using both numerical and theoretical approaches. The effective thermal conductivity (ETC) of such composites is examined as a function of the TC ratios, volume fraction (VF), and particularly particle distribution and partic...

In this study, a three-dimensional internal natural convection heat transfer between a cuboidal enclosure and a spherical surface placed in the enclosure, is investigated numerically. The effects of enclosure shape and Rayleigh number on the flow and heat transfer characteristics are analyzed for concentric and eccentric positions of sphere, respec...

In this study, an innovative thermal interface material (TIM) paper based on a composite of cellulose and graphene is investigated experimentally. Six types of commercially-available papers: a wool paper; an aqua satin; a merit paper; a new craft board; and two oriental traditional papers (Bulgyeong and Daerye) are used to fabricate the paper-graph...

Core-shell heterostructures have attracted considerable attention owing to their unique properties and broad range of applications in lithium ion batteries, supercapacitors, and catalysis. Conversely, the effective synthesis of Bi2S3nanorod core@ amorphous carbon shell heterostructure remains an important challenge. In this study, C@Bi2S3core-shell...

In this study, an innovative method for the measurement of the LED junction temperature is proposed. In the proposed technique, the temperature values at the LED chip surface, at the solder joint, and at a substrate point in the vicinity of the LED are measured, and the results are compared with the junction temperature measured by transient therma...

This paper presents an experimental study on the thermal performance of SMD-LEDs (Surface Mount Device-Light Emitting Diodes) mounted on plate-fin heat sink (HS) and effects of LED arrangement, HS size, particularly heat spreading effect by electric wire pattern in PCB. Various types of LED arrays and HS sizes were investigated for both wide and na...

This paper presents an investigation on the thermal conductivity (TC) enhancement for polymer composites reinforced with randomly distributed hybrid filler using both numerical and theoretical approaches. Effects of thermal contact resistances (TCR) at the interfaces between fillers and the matrix material are considered comprehensively. Consequent...

Noble-metal-free co-catalyst supported with a highly active and stable photocatalyst is of considerable importance to realize low cost and scaled up photocatalytic hydrogen evolution. An inorganic–organic two-dimensional (2D)/one-dimensional (1D) graphitic carbon nitride (g-C3N4) nanosheet anchored with a vanadium pentoxide (V2O5) nanoparticle hete...

In this study, we propose innovative analytic and experimental methods for thermal management of SMD-type LED chips: a geometry optimization algorithm of natural convective heat sinks together with a novel technique for estimation of the LED surface temperature. An analytic algorithm for the optimal design of the LED heat sink is proposed. By using...

Coupling of two active semiconductors can easily lead to a deterioration of their intrinsic properties. In this work, tiny MoO3 nanocrystals were deposited on 3D MoS2 frameworks via a hydrothermal reaction, with heterostructures forming by oxygen-bonding interactions at their interface. When tested as a supercapacitor electrode, the MoS2/MoO3 heter...

A zero-dimensional/two-dimensional heterostructure consists of binary SnO2–ZnO quantum dots (QDs) deposited on the surface of graphitic carbon nitride (g-C3N4) nanosheets. The so-called SnO2–ZnO QDs/g-C3N4 hybrid was successfully synthesized via an in situ co-pyrolysis approach to achieve efficient photoactivity for the degradation of pollutants an...

In this study, a novel flexible and thin flat-plate heat pipe is fabricated and its thermal performance is characterized experimentally. The heat pipe considered in this study is made of copper-only, and employs an innovative mesh-type wick structure with nanostructured superhydrophilic surface. A single-layered copper woven mesh with nanostructure...

There is still a need to prepare heterostructure photocatalysts with high activity and recyclability but without using precious metals to reduce the cost of photocatalysts. Thus, a facile and simple method for the synthesis of a Na2Ti3O7 nanotube–V2O5 heterostructure photocatalyst via hydrothermal synthesis is reported herein. The chemical composit...

Novel mesoporous ternary hybrids comprising Bi2O3/V2O5 photocatalysts anchored on graphitic carbon nitride (g-C3N4) nanosheets were synthesized via an in situ co-pyrolysis approach and characterized by a series of techniques, including X-ray diffraction, field emission scanning electron microscopy, transmission electron microscopy (TEM), high-resol...

Novel electrode materials for supercapacitors comprised of carbon and copper oxide (CuO) nanospheres on graphitic carbon nitride (g-C3N4) nanosheets, denoted as C/[email protected]3N4 are self-assembled via a one-step co-pyrolysis decomposition method. The pure g-C3N4 and C/[email protected]3N4 were confirmed by powder X-ray diffraction (XRD), high...

A novel Cu2O/TiO2/Bi2O3 ternary nanocomposite was prepared, in which copper oxide improves the visible light absorption of TiO2 and bismuth oxide improves electron–hole separation. The ternary composite exhibited extended absorption in the visible region, as determined by UV–Vis diffuse reflectance spectroscopy. High-resolution transmission electro...

Herein, we discuss the synthesis of reduced graphene oxide and TiO2 (rGO-TiO2) nanocomposites with varying ratios of rGO to TiO2 by hydrothermal method. Photocatalytic ability of the nanocomposites was assessed for H2 production under natural sunlight. At 5 wt% GO loading, the rGO-TiO2 exhibited 24,880 μmol/g/h H2, 12.9 times to commercial P25-TiO2...

Photocatalytic water splitting technologies are currently being considered for alternative energy sources. However, the strong demand for a high H2 production rate will present conflicting requirements of excellent photoactivity and low-cost photocatalysts. The first alternative may be abundant nanostructured titanate-related materials as a photoca...

In this experimental studies, we report the synthesis of TiO2 co-doped by both cationic and anionic sites by simple sol-gel based method. All the prepared samples exhibit the anatase crystalline morphology however, showed lattice distortion caused by the displacement of Ti⁴⁺ sites by Gd³⁺. The improved visible absorption is witnessed by the Gd and...

Micro-post wick is a promising candidate for liquid-based thermal management of future electronics and energy systems. In this study, the permeability of the dual-height micro-post wicks is investigated numerically with taking into account the shape of meniscus. The meniscus shape of liquid in dual-height micro-post wicks is estimated based on surf...

This paper describes an extensive study on thermal conductivity (TC) of polymer composites with randomly distributed hybrid fillers. Finite element method in combination with user-defined code is used to predict accurately the TC of these composites under many effects and effective parameters such as volume fractions (VFs) and TC ratios of fillers...

The printed circuit heat exchanger (PCHE) is a key component in the future compact energy cycles due to its high heat transfer performance and structural rigidity. In this study, the thermal performance of wavy-channeled PCHEs, and the effects of the waviness factors: the amplitude and the period, on the thermal performance of the PCHE are investig...

The development of high-activity, long-life, precious-metal-free photocatalysts for redox reactions in photoelectrochemical cells and fuel cells remains challenging. The synthesis of high-activity heterostructured photocatalysts is crucial for efficient energy conversion strategies. Herein, a novel photocatalyst based on 1D Bi2S3 nanorods self-asse...

Mn-doped SnO2 quantum dots (QDs) with different Mn concentrations were prepared by solution combustion synthesis. The crystallite size was under 5 nm was confirmed from XRD and HR-TEM. A considerable decrease in band gap energy was observed with the increase in Mn content. The PL spectra show orange emission at about 590 nm due to the ultra-small c...

In this study, the thermal performance of plate fin heat sinks with dual-height fin profile subject to natural convection is considered. The effect of dual-height configuration, fin spacing and channel length on the thermal performance of the heat sink is investigated numerically. The results show that the thermal performance of the dual-height hea...

Herein, we reported a plasmonic photocatalyst, Ag-SnO2 quantum dots (QDs) for the abatement of water pollution by a simple and one pot synthesis in water. The Ag-SnO2 QDs were prepared with various concentrations of Ag loading. The as synthesized plasmonic photocatalysts were systematically investigated by X-ray powder diffraction (XRD), high-resol...

In droplet-based microfluidic systems, microchannel design plays a primary role in transport and manipulation of liquid droplets. The objective of this paper is to investigate dynamics of a droplet in planar contraction microchannel via three-dimensional numerical simulation and theoretical analysis. In particular, this study characterizes three re...

Herein, we reported a sunlight driven photocatalyst, SnO2 quantum dots (QDs)-g-C3N4 nanolayers (NLs) for the abatement of water pollution. SnO2 QDs were prepared in the presence of g-C3N4 NLs and the average crystallite size of SnO2 QDs was achieved below 3 nm. The interactions between both SnO2 QDs and g-C3N4 NLs are strong, as established by diff...

A compact electrospray system has been developed using a cone-shaped porous medium. The cone-jet conditions with a stable spraying mode were measured using ethanol and lavender oil, and the average diameter and size distribution of the sprayed droplets were investigated according to the applied voltage. In addition, the spray stability over time wa...

We report a simple and large-scale one-pot method for the synthesis of Bi2S3 nanorods by using the complexation of Bi(NO3)3·5H2O and Na2S·9H2O precursors. The as-synthesized photocatalyst was characterized by scanning electron microscopy, transmission electron microscopy, high-resolution transmission electron microscopy, X-ray diffraction, high-res...

Bulk-to-single layer molybdenum disulfide (MoS2) is widely used as a robust candidate for photodegradation of organic pollutants, hydrogen production, and CO2 reduction. This material features active edge sites and narrow band gap features, which are useful for generating reactive species in aqueous suspensions. However, the high-charge carrier rec...

A multifaceted ternary MoS2/Al2O3/g-C3N4 nanocomposite was prepared from a simple and facile hydrothermal method, which has good photocatalytic performance for the degradation of crystal violet (CV) dye under visible light irradiation. As a result of wide structural features for the charge separation mechanism, the formation of a ternary heterojunc...

Copper (Cu)-doped tin oxide (SnO2) quantum dots (QDs) were prepared using energy-efficient solution combustion synthesis. The synthesized nanoparticles were characterized by XRD, TEM, XPS, UV–Vis DRS, and FT-IR. The X-ray diffraction (XRD) pattern shows that the QDs have tetragonal rutile-like structure. HR-TEM shows modification in the growth inhi...

This study investigates end-milled surfaces of HDPE-MWCNT polymer nanocomposite. The feed rate and the cutting speed are varied and their effects on the surface roughness are investigated in detail. The relationship between the surface roughness and the processing parameters are investigated by using a response table and a response function. In add...

A hybrid consisting of ZnS nanoparticles supported on layered MoS2−ZnS was synthesized by a hydrothermal method based on self-assembly technique without using a template. XRD, SEM-EDX, TEM, HR-TEM, TG-DTA, XPS, N2 adsorption-desorption, and UV–Vis spectroscopies were used to characterize the structural features, morphology, and composition of the M...

The printed circuit heat exchanger (PCHE) is regarded an essential component in the S-CO2 (supercritical carbon dioxide) cycle due to its high compactness and structural rigidity. In this study, a mathematical expression for predicting the thermal performance of cross, parallel, and counterflow PCHE with semicircular channels is proposed as a close...

The supercritical CO2 (S-CO2) energy cycles are gaining increasing attention due to its high efficiency in a compact footprint and ability to utilizing various heat sources. The printed circuit heat exchanger (PCHE) is regarded an essential component in the S-CO2 cycle due to its high compactness and structural rigidity. In this study, an innovativ...

The printed circuit heat exchanger (PCHE) is regarded as a promising candidate for advanced heat exchangers for the next-generation supercritical CO_2 power generation owing to its high compactness and rigid structure. In this study, an innovative type of PCHE, in which the channel sizes for the heat source fluid and heat sink fluid are different,...

We report a simple solution-chemistry approach for the synthesis of ZrO2/MoS2 hybrid photocatalysts, which contain MoS2 as a cocatalyst. The material is usually obtained by a wet chemical method using ZrO(NO3)2 or (NH4)6Mo7O24·4H2O and C8H6S as precursors. The structural features of obtained materials were characterized by X-ray diffraction (XRD),...

This paper describes an extensive study on enhancing the thermal conductivity (TC) of core–shell nanoparticle polymer composites under the effects of the TC ratios between core nanoparticles, shell layer and the matrix material, and the volume fractions (VF) of core and shell. Finite element method is used for both numerical simulation and solving...

Heterogeneous nanofillers have been regarded as a promising candidate for enhancing the thermal conductivity (TC) of pure polymers. In this study, the effective thermal conductivity (ETC) of polymer composites containing heterogeneous nanofiller is investigated by numerical approach. Many effects of effective parameters are examined, which are the...

Advances in micro and nanotechnology have motivated a number of recent studies on transparent and flexible polymers (TFP). In this study, a literature review on a thermal conductivity (TC) of these polymers containing fillers is first presented. Three major types of TFPs considered are poly-dimethyl siloxane (PDMS), polyethylene terephthalate (PET)...

This study aims to numerically investigate the effect of meniscus curvature on the permeability of closely-packed spheres, which have widely used for heat pipes and vapor chambers. The shape of the meniscus curvature in the hexagonally-packed spheres is estimated based on surface energy minimization algorithm. The estimated meniscus shape is then i...

This study analyzed the concentrations and size distributions of ultrafine particles, as well as their chemical components and morphologies, in the context of manufacturing processes, focusing on injection molding and tool repair. The concentrations of water-soluble gases such as sulfur dioxide (SO2), which is an undesirable emission, were measured...

The heat pipe is a well-known cooling module for advanced electronic devices. The heat pipe has many applications, particularly in electronics and related area such as PC, laptop, display, artificial satellite, and telecommunication modules. The heat pipe utilizes phase change heat transfer inside enveloped structures, where the working fluid evapo...

Numerical studies were performed on natural convection heat transfer from radial heat sinks with perforated ring. The effects of perforation number (0-6), perforation diameter (0-3 mm), and perforation length (1.5-6 mm), and orientations angle (0-180 degrees) on the thermal performance were investigated. The results show that radial heat sinks with...

Wicks play an important role in determining the thermal performance of heat pipes. Foam-type wicks are known to have good potential for enhancing the capillary performance of conventional types of wicks, and this is because of their high porosity and permeability. In this study, we develop an analytic expression for predicting the permeability of a...

In this study, we numerically investigate the thermal performance of an enhanced radial heat sink with a perforation and chimney structure. We estimate the thermal performance of the enhanced radial heat sink, and compared it with that of a conventional radial heat sink. The results show that the radial heat sink with perforation has a higher therm...

This paper presents a numerical study for predicting the optimal spacing (OS) of decaying heat sources/sinks in a conducting medium. The optimal configuration that minimizes the overall thermal resistance between the cylinder array and surrounding medium is tracked using interpolation technique. Consequently, the dimensionless OS obtained is of the...

We report the one-step synthesis of MoO3-supported SnO2 composite using a wet chemical method. The structural features of the composite with respect to the MoO3 content are discussed. The composites were characterized using X-ray diffraction, field emission scanning electron microscopy (FESEM), high-resolution transmission electron microscopy (HRTE...

In the present study, we have synthesized undoped and Cu2+-doped CdO nanopowders by a mild solution method at room temperature. Powder X-ray diffraction, optical absorption, electron paramagnetic resonance and Fourier transform infrared measurements are used to characterize prepared powders. The powder X-ray diffraction patterns reflect the cubic c...

This paper reviews the thermal conductivity (TC) enhancement of transparent and flexible polymer composites. Poly-dimethyl siloxane (PDMS), polyethylene terephthalate (PET), and polyimides (PI) are considered. The physical properties of these polymers reinforced with many highly conductive fillers have been investigated by both experimental and num...

In this study, the natural convection heat transfer from chimney-based radial heat sinks was investigated numerically and experimentally. The thermal performance of a radial heat sink with chimney was estimated and compared with that of a radial heat sink without a chimney. The effects on the heat sinks' thermal performance were investigated in reg...

Transition metal dichalcogenides (TMDs) synthesis using simple and facile methods has been considered as the most feasible approach for preparing different types of large-area two-dimensional (2D) layered materials. In this chapter, we report the current progress in the synthesis of TMDs and their morphology-dependent characteristics and highlight...

In this paper, we report mesoporous WS2 nanosheets with a crystalline network that were synthesized using CTAB as a structure-directing agent via self-assembly induced by hydrothermal and thermal evaporation. Powder X-ray diffraction, Raman spectra, and high-resolution X-ray photoelectron spectroscopy results confirmed the formation of WS2 structur...

In this paper, we report the influence of CTAB surfactant on solvothermally obtained mesoporous tungsten disulfide (WS2). The role of CTAB concentration in the formation of mesoporous WS2 structure is demonstrated. The X-ray diffraction (XRD) analysis revealed the presence of hexagonal WS2. The field emission scanning electron microscopy (FESEM) an...

In this study, the orientation effect on the thermal performance of radial heat sinks with a circular base, concentric ring, and rectangular fins were investigated experimentally and numerically. The effects of orientation angle with respect to gravity (0 ⩽ θ ⩽ 180°), Elenbaas number (0.5 < El < 50), and non-dimensional fins spacing (0.273 ⩽ s∗ ⩽ 0...

Adding dual kinds of nanoparticle fillers with higher thermal conductivity (TC) into matrix materials provides versatile and effective means for enhancing the TC of polymer materials. In this study, the effective thermal conductivity (ETC) of composite materials with heterogeneous-filler-nanoparticles is investigated based on an extensive FEM numer...

This paper presents numerical and experimental studies on the heat transfer characteristics around a radial heat sink with a horizontal circular base, concentric ring, and rectangular fins that are subject to natural convection. An FVM (Finite Volume Method) numerical model was used to analyze the temperature and natural convection heat transfer on...

In this study, a numerical study on the time shift of time-of-flight (TOF) thermal flow sensor is performed based on Finite Volume Method (FVM). The TOF is modeled as parallel cylinders, and the governing equations for transient fluid flow and heat transfer, as well as boundary conditions, are established. In order to provide a physical understandi...

This study describes the dynamic behaviors of droplet formation in microfluidic crossjunction devices (MFCDs) based on a two-dimensional numerical model using the volume of fluid (VOF) method. The effects of the junction angle (φ=30 to 90 deg) between the main and side channels and the viscosity ratios (β=10-5 to 2.0) are considered. The numerical...

MoS2 nanosheets decorated with SnO2 mesoporous nanoparticles were successfully prepared by a facile two-step method. The MoS2 nanosheets were pre-synthesized using a solvothermal method and then decorated with the SnO2 mesoporous nanoparticles through a wet chemical method. The nanocomposite was characterized with powder X-ray diffraction (XRD), fi...

This paper reports the solvothermal synthesis of MoS 2 nanoflowers and nanosheets. The nanoflowers have a mean diameter of about 100 nm and were obtained using thioacetamide (C 2 H 5 NS) as a sulfur source. The few layered nanosheets were obtained using thiourea (CH 4 N 2 S) as a sulfur source. The obtained powders were characterized using powder X...

This paper reports the synthesis of novel monodisperse Al 2 O 3-coated molybdenum disulfide nanospheres (i.e., core-shell structures) using a one-step facile hydrothermal method. XPS analysis confirmed the purity and stable structure of the Al 2 O 3-coated MoS 2 nanospheres. A possible growth mechanism of the core-shell structure is also reported,...

In this study, the evaporation of a cryogenic gas in an insulating porous medium was investigated numerically and experimentally. The flow and heat transfer characteristics around the evaporating cryogenic gas in such a medium were analyzed based on the VOF (Volume of Fluid) method. The thermal leakage through the porous medium to the outer shell w...

We developed a novel cylindrical magnetic levitation stage that provides rotational motion with high precision in a vacuum environment. The heat dissipation from a magnetic levitation stage is investigated numerically. In order to facilitate heat transfer from the inner space vacuum, a copper pipe is inserted in the coil base of the stator to circu...

Abstract This article reports an experimental and numerical study on the orientation effect for a radial heat sink with a circular base, concentric ring, and rectangular fins. Parametric studies are performed to investigate the effects of orientation angle with respect to gravity, various geometric parameters (fin number, fin length, fin height, an...

Finite element method was used to investigate the effects of heater location and heater size on the natural convection heat transfer in a 2D square cavity heated partially or fully from below and cooled from above. Rayleigh Number (5×102 ≤ Ra ≤ 5×105), heater size (0.1 ≤ D/L ≤ 1.0), and heater location (0.1 ≤ xh/L ≤ 0.5) were considered. Numerical...

Molybdenum disulfide (MoS2) nanopowder has been prepared using a co-precipitation method. This paper describes the thermal effect on the morphology enhancement of MoS2 sphere-like structures into nanorods with a winding structure. For the reduction in precursors, the as-obtained MoS2 nanopowder was calcinated at 250, 400, 600, and 800 °C for 1 h in...

In this study, the heat transfer characteristics of an aluminum foam heat sink subject to an impinging air jet is investigated experimentally, under fixed pumping power condition. The effects of dimensionless pumping power, Reynolds number and the dimensionless impinging distance on the Nusselt number are considered. The result shows that the effec...

The Cd0.9Co0.1Fe2O4 nanoparticles are synthesized using chemical co-precipitation method. The as-prepared samples are calcinated at 300 and 600 °C for 2 h. The thermal effects on structural, morphological and magnetic properties are reported. The X-ray diffraction data confirm the formation of single-phase cubic spinel structure. The Surface morpho...

Enhancing the thermal conductivity of polymer materials is actively being attempted by applying metal/carbon-based micro-/nanoparticles with higher thermal conductivity. In this study, a generalized correlation for predicting the thermal conductivity of composite materials is proposed based on an extensive FEM numerical study. The effects on the ef...

In this study, droplet formations in microfluidic double T-junctions (MFDTD) are investigated based on a two-dimensional numerical model with volume of fluid method. Parametric ranges for generating alternating droplet formation (ADF) are identified. A physical background responsible for the ADF is suggested by analyzing the dynamical stability of...

In this study, the capillary pressure of hexagonal arrays of micro-square-pillars is investigated analytically. The effects of spacing between pillars (30 ≤ s ≤ 90 μm) and contact angle (10° ≤ θ ≤ 50°) on the capillary pressure are considered. In order to estimate the capillary pressure, the shape of liquid interface in the micro-square-pillar arra...

Spark plasma sintering (SPS) is a material processing technique based on the Joule heating of a mould and powder under an electrical pulse or DC current. This study demonstrates the use of silicon carbide (SiC). A finite-element numerical study was performed to predict the temperature and stress distributions during SPS. In addition, it was found e...

In this study, an optimal design method for minimizing the size of plate fin heat sinks subject to natural convection is proposed. An analytic model for predicting the thermal resistance of a fin array, as well as the heat sink substrate, is developed. In order to validate the analytic results, we performed numerical study and experimental studies....

Fe3+-doped Zn3(BO3)2 powder is synthesized using a co-precipitation method. Powder X-ray diffraction (PXRD), scanning electron microscopy (SEM), optical absorption, electron paramagnetic resonance (EPR), photoluminescence (PL), and Fourier transformation infrared (FTIR) spectroscopy were used to analyze the synthesized sample. The PXRD patterns con...

In the present study, we have synthesized undoped and Cu2+-doped CdO nanopowders by a mild solution method at room temperature. Powder X-ray diffraction, optical absorption, electron paramagnetic resonance and Fourier transform infrared measurements are used to characterize prepared powders. The powder X-ray diffraction patterns reflect the cubic c...

In this study, we consider the permeability of hexagonal arrays of micro-square pillars. A semi-analytic model for predicting the permeability of micro-square pillar arrays is developed. In addition, a numerical analysis is performed with taking into account the effect of meniscus curvature. The analytic and numerical results are in good agreement,...

In this study, the least material optimization of natural convective heat sinks subject to a localized heat source is performed. An analytic method for predicting the thermal resistances of fin array and heat sink base is presented. The presented analytic method is shown to predict the experimental results well within 5%. Based on the analytic resu...

In this study, the capillary performance of the micro-post wicks with non-homogeneous configurations is investigated and compared with a conventional micro-post wick with homogeneous configuration. The experimental and numerical studies show that the capillary performance of the micro-post wick can be significantly enhanced, compared with the homog...

In this article, an advanced cooling surface based on micro-post arrays with non-homogeneous configurations is investigated and compared with conventional micro-post arrays with homogeneous configuration. The capillary performance of micro-post arrays are characterized using the capillary rate of rise experiments and numerical simulations which tak...

In this study, the critical heat flux of bi-porous sintered copper coatings in FC-72 is investigated experimentally. The effects of particle size (45 <= d <= 100 gm), cluster size (250 D <= 675 gm), and coating thickness (0.7 <= t <= 3 mm) on the critical heat flux are considered. The results show that the bi-porous coatings can improve the critica...

In this study, the effects of the particle size distribution and packing structure on the permeability of sintered porous wicks are investigated experimentally and analytically. The wicks with various particle size distributions are prepared by sieving the raw particles into various fractions and the permeabilities of the sintered wicks are measure...

In this study, the permeability of mono- and bi-dispersed porous media is considered. The effects of the particle size distribution and the packing structure of particles on the permeability are investigated experimentally and analytically. Both experimental and analytic results suggest that the particlesize distribution is close to the log-normal...

In this paper, the boiling limit of bi-porous sintered metal wicks is considered. The effects of the particle size (45 ⩽ d ⩽ 200 μm) and the cluster size (250 ⩽ D ⩽ 675 μm) on the boiling limit are investigated experimentally and analytically. In order to gain understanding of the boiling phenomena in bi-porous wicks, the bubble movements in the bi...