Comsol Multiphysics - Science topic

Enhancing thermoelectric performance hinges on optimizing the geometry of thermoelectric legs. In this study, we present a novel asymmetrical annular thermoelectric generator (ATEG) in which the proportions of P-type and N-type legs are meticulously balanced. We construct a one-dimensional analytical model tailored to this ATEG. Utilizing this mode...

Alkali-silica reaction (ASR) is a deleterious expansion phenomenon affecting concrete structures worldwide. It occurs when a susceptible chemical composition of concrete components is present, and it is particularly rampant in inherently humid environments. This phenomenon is exacerbated when found in mass concrete structures such as dams and found...

This work uses the full-vectorial finite element method to study a novel three-dimensional (3D) integrated Graphene-Porous Silicon plasmonic waveguide-based nanostructure for deoxyribonucleic acid (DNA) hybridization. In this study, a porous silicon (p-Si) waveguide is designed using the Maxwell Garnett model and is sandwiched between two low-index...

A novel microfluidic device and electronic infusion system for carbon nanotube-calcium chloride alginate microfibers are presented in this study. The microfluidic device was designed using Google SketchUp and 3D printing, and the electronic infusion system-controlled alginate solution flow to the calcium chloride jar—the silicon-PDMS microfluidic d...

A novel refractive index (RI) plasmonic biosensor with a high sensitivity for human blood group detection is proposed and numerically investigated in the visible and near-infrared (NIR) regime. The proposed structure is based on a metal-insulator-metal (MIM) waveguide with an array of elliptical nanoholes. These nanoholes are used as the sensing su...

In the realm of 3D bioprinting, the ultimate objective is the creation of functional tissue constructs, achieved through precise control of inkjet performance and the ideal bioink composition. While the experimental standardization of these attributes can be time-consuming, their comprehension is facilitated through simulation analysis. In this pap...

The high concentration of nitrogen dioxide (NO2) gets it one of the most popular and harmful air pollutants. This work examines the NO2 gas sensing properties of palladium-doped zinc oxide (Pd-ZnO) nanorods. The Pd-ZnO nanorods were synthesized by chemical hydrothermal method with different Pd doping concentrations (0–1 wt%). The Pd-ZnO nanorods we...

The global agricultural sector supports human civilization by ensuring food production and security for an expanding global population. The water crisis and climate change are among the main challenges for the development of agriculture. Greenhouses provide controlled environments for sustainable crop cultivation, addressing these challenges and en...

The LabPET II detection module serves as the fundamental component within Positron Emission Tomography (PET) scanners designed for achieving ultra-high-resolution imaging of small to medium-sized animals as well as the human brain. To ensure peak performance, it is imperative that this module operates consistently at a stable temperature. In this p...

The triboelectrification effect caused by dynamic contact between particles is an issue for explosions caused by electrostatic discharging (ESD) in the triboelectric nanogenerators (TENGs) for powering the flexible and wearable sensors. The electrostatic strength of dielectric particles (surface charge density, surface potential, electric field, et...

A photonic crystal fiber (PCF) sensor for detecting harmful chemicals such as di(2-ethylhexyl) phthalate (DEHP), bisphenol A (BPA), and bisphenol S (BPS) in polycarbonate plastics has been proposed using fused silica as the substrate, consisting of a decagonal core hole and 2 layers of circular cladding air holes arranged in a hexagonal pattern, an...

Photoacoustic (PA) medical imaging is a crossbred technique relying on light-induced ultrasonic waves due to the PA effect phenomenon recorded primarily in 1880 by A. G. Bell. Numerical simulation, also known as in-silico, studies assist scientists in minimizing incorrect PA experiments in both in-vitro and in-vivo. Numerical modeling techniques he...

The use of annular one-dimensional (1D) photonic crystals (PCs) for salinity sensing is studied in this research. Annular 1D-PCs provide small and integrated structures that facilitate the creation of portable and miniaturized sensor equipment appropriate for field use. In order to generate annular 1D-PCs, the research explores the finite element m...

Modeling of workflows of electromechanical systems with linear electromagnetic motors (LEMM) is an integral tool for their improvement in relation to discrete operations, processes and technologies of the agricultural industry or the processing of agricultural products. At the same time, the use of typical application packages for the construction...

Thermoforming of continuous fiber-reinforced plastics made of semi-crystalline thermoplastics has gained significant interest due to its potential for producing lightweight and high-strength components for various applications. Before thermoforming, a laminate is heated to a temperature beyond the melting point of the thermoplastic. During the subs...

In this work, a microfluidic prototype based on polymeric materials was developed to monitor surface processes using surface-enhanced Raman spectroscopy (SERS), keeping the reagents free of environmental contamination. The prototype was fabricated on poly(methyl methacrylic acid) (PMMA). A micrometric membrane of a functional organic polymer (FOP)...

This paper proposes a new configuration of dielectric-metal-dielectric (DMD) waveguides to design optical logic gates. Seven plasmonic logic gates, including NOT, OR, AND, NAND, NOR, XOR, and XNOR, are realized by one nanoring and four DMD plasmonic waveguides. To realize the logic gates, an ultrasmall size of 300 nm × 300 nm device is designed. Th...

Different solid materials are widely used in various constructions due to their availability and low cost. However, cracks or conversions in the structures can affect their stiffness and vibration signatures. This research aims to evaluate the load distribution, deformation, and the effects of the cracks on the natural frequencies and deformations...

In the background environment of the serious problem of high temperature heat damage in deep mining, some mines have complex and interlocking forms of roadway arrangement, with the innovative concept of cooling on demand as the principle, this paper develops a mobile ice cooling equipment, and introduces and explains the equipment from the perspect...

This paper presents the study of a new innovative heat flow single-cell calorimeter dedicated to the measurement of the nuclear heating rate in research reactors. Before irradiating this type of sensor, it is necessary to characterize it under laboratory conditions to determine its metrological properties. A general description (design, geometry an...

Introduction: Metamaterials consist of periodic arrangements of artificial subwavelength units that possess electromagnetic properties not present in natural media. It has attracted more interest due to its ability to alter electromagnetic radiation in a flexible manner, which has resulted in the development of multiple radio frequency devices base...

两个计算域的辐射功率f*T^4[W/m3], 1.2*f*T^4[W/m3],吸收率为0.2[1/m],0.1[1/m],器壁温度293.15K，发射率=0，计算系统存在温差：辐射强的区域温度较低，辐射强的区域温度较低，温差10K以上。热力学第0定律和第2定律都是错误的。这样现象是客观存在的：比如相同条件下，二氧化碳和水蒸气的辐射功率会大于氧气和氦气。这种不对称的辐射条件是任意工程设置的，不受热力学第2定律的和第0定律的约束。

The radiation power f * T^4 [W/m3], 1.2 * f * T^4 [W/m3], absorption rates of 0.2 [1/m], 0.1 [1/m], wall temperature of 293.15K, emissivity=0 in two calculation domains,The thermal conductivity of two media is equal to 1 [w/m2K]. and there is a temperature difference in the calculation system: the temperature in areas with strong radiation is lower...

The present study offers a comprehensive thermal modeling of spark plasma sintering (SPS) for a titanium carbide (TiC) sample. Utilizing COMSOL Multiphysics Software, the research investigates the temperature distribution within the TiC sample, situated within a graphite die. The study employs governing equations for heat diffusion, augmented by te...

A Friedrich–Wintgen bound state in the continuum (FW-BIC) is of particular interest in the field of wave physics phenomena. It is induced via the destructive interference of two modes that belong to the same cavity. In this work, we analytically and numerically show the existence of FW-BIC in a T-shaped cavity composed of a stub of length d0 and tw...

In this paper, the thermal conductivities of the square thermal invisibility cloak are constructed in two ways. One is the direct method, another is the rotation matrix method. The thermal conductivity coefficients obtained by the two methods are the same. The cloud map of thermal conductivity coefficient of the thermal cloak is drawn, which can he...

modélisation par comsol

This manuscript presents a Kretschmann configured long-range surface plasmon resonance (LRSPR) imaging sensor (structure: 2S2G prism-MgF2-Ag-PtSe2-BlueP/MoS2-SM) demonstrating ultrahigh imaging sensitivity, SImg. (23,250 RIU−1); detection accuracy, DA (50 Deg.−1); angular figure of merit, FoMAng. (1930.87 RIU−1); imaging figure of merit, FoMImg. (1...

One of the main features of microwave plasma reactors is the electric field structure in the resonant cavity, which must be both intense and uniform in front of the substrate. For this reason, transverse magnetic modes are often used, especially axisymmetric modes because they produce an axisymmetric plasma. Microwave plasma reactors can be differe...

Low utilization of solar energy remains a challenge that limits photocatalytic efficiency. To address this issue, this work proposes a bionic solar photocatalytic reactor (BSPR) for efficient selective oxidation of aromatic alcohols. A biomimetic phototropic hydrogel is prepared by coupling chlorine‐doped polypyrrole (Cl‐PPy) and poly(N‐isopropyl a...

Interfacial solar evaporation is regarded as the promising technology to mitigate freshwater scarcity. However, when polluted water is used, toxic pollutants might accumulate in the bulk water. Herein, we report the production of Ni‐MOF nanorod from waste poly(ethylene terephthalate) and fabricate bifunctional Ni‐MOF‐based evaporators. Owing to hig...

The paper presents the design and simulation of a MEMS-based resonant viscosity sensor using a piezoelectric micro diaphragm. The sensor comprises a vibrating diaphragm as a resonating element with piezoelectric excitation and detection. As the viscosity of the liquid beneath the diaphragm changes, the resonant frequency also changes. A numerical m...

Currently, the heat generated during coal core tube sampling causes rapid gas desorption, leading to substantial measurement errors in laboratory gas content assessments. Reducing these errors requires studying frictional heat from core tube friction against the hole wall and coal core temperature rise. Combining the independently developed device...

Dry hot rock geothermal resources by virtue of its wide distribution, large reserves, clean and low-carbon, stable, high utilization rate, and other characteristics have been widely used. The enhanced geothermal system (EGS) is the most efficient approach for harnessing and exploiting geothermal energy from hot, arid rock formations. To investigate...

In the research for the decarbonization processes, electrochemistry is among the most studied routes for the conversion of carbon dioxide in added-value products, thanks to the up-scalability and the mild conditions of work of the technology. In this framework, modeling the electrochemical reactor is a powerful tool to predict and optimize importan...

The effectiveness of power battery refrigerant direct cooling systems of electric vehicles incorporating capillary wicks is directly determined by these wicks’ transport performance. The Fries–Dreyer equation describes wicking behavior, but there is a significant gap between its predictions and the experimental results as reported in the literature...

Plasma, a complex fluid consisting of electrons, ions, neutrals, and excited species, exhibits both fluid-like behavior and electrical conductivity due to the presence of charge carriers. Consequently, computational modeling of plasma requires the integration of fluid and electrical models. This research paper presents a study on the steady-state c...

Transmission lines may suffer from pin defects, necessitating regular patrols and maintenance. The traditional maintenance approach not only involves a substantial workload and low efficiency but also poses a threat to the safety of maintenance personnel. To address the issue of pin defects in high‐voltage transmission lines, this paper introduces...

Vagus Nerve Stimulation (VNS) is an emerging treatment option for a myriad of medical disorders, where the method of delivering electrical pulses can vary depending on the clinical indication. In this study, we investigated the relative effectiveness of electrically activating the cervical vagus nerve among three different approaches: nerve cuff el...

En los últimos años la tendencia en el desarrollo emergente de biosensores autónomos y portátiles han propiciado la búsqueda de nuevos materiales, además del diseño de nuevas estructuras que generen su propia energía de manera eficiente y con alto rendimiento para asegurar el suministro energético a largo plazo, eliminando el uso de baterías extern...

This study develops a framework for determining the material parameters of layered engineered wood in a nondestructive manner. The motivation lies in enhancing nondestructive evaluation (NDE) and quality assurance (QA) for engineered wood or mass timber, promising construction materials for sustainable and resilient civil structures. The study empl...

To reduce the gas disaster of high gas coal seam and improve the efficiency of gas extraction by high drilling, the layout parameters of drilling holes in Pingdingshan coal mine are optimized. Based on the analysis and calculation of the "three zones" of the movement towards the overly strata of No.10 coal in Pingdingshan coal mine, the height of c...

Objective: High-resolution retinal prosthetics offer partial restoration of sight to patients blinded by retinal degenerative diseases through electrical stimulation of the remaining neurons. Decreasing the pixel size enables an increase in prosthetic visual acuity, as demonstrated in animal models of retinal degeneration. However, scaling down the...

In this manuscript, we comprehensively evaluate a newly devised biosensor that utilizes the Kretschman confguration and incorporates Tantalum Disulfde (TaS2) for Long Range Surface Plasmon Resonance (LRSPR). We optimized the performance of the sensor by simulating with diferent metals [specifcally, gold (Au), silver (Ag), and aluminium (Al)] and fo...

In the cycle of uncontrolled tumor proliferation in cancer patients, cell fragments from the primitive tumor tissue disseminate throughout the body by blood flow stream or lymph, tagged as circulating tumor cells (CTCs), serve as an important biomarker for early cancer diagnosis. Deterministic Lateral Displacement (DLD) is one of the widely preferr...

The paper considers the statement of a single-mode sound generation in a duct with flow in the COMSOL Multiphysics finite element analysis software. Verification of the COMSOL Multiphysics solution is based on a comparison with the analytical solution of a single-mode propagation in an annular duct with uniform flow. The verified statement of a sin...

The current study presents a computational fluid dynamics (CFDs) model designed to simulate the microfiltration of 2D materials using hollow fiber membranes from their dispersion. Microfiltration has recently been proposed as a cost-effective strategy for 2D material production, involving a dispersion containing a permeating solute (graphene), a fo...

Assessment of energy performance became a necessary part of everyday architectural design as the building stock is a significant energy consumer. Different stages of a project require different granularities of evaluation. Typically, as the project moves forward, the level of geometry (LOG) of the digital assets increase, which proposes minor issue...

Graphene-based Field-Effect Transistors (FETs) integrated with microstrip patch antennas offer a promising approach for Terahertz signal radiation. In this study, a dual-stage simulation methodology is employed to comprehensively investigate the device’s performance. The initial stage, executed in MATLAB, delves into charge transport dynamics withi...

One of the most prevalent techniques used in the construction of optical fiber-based pressure sensors is Fabry-Perot interferometry. This work presents a variety of interferometric sensors based on this feature. To achieve this, we used chemical etching (HF) to create conical cavities at the ends of the optical fibers (SMF) and (GRIN), where the fi...

In order to improve the quality of quick-frozen diced mango, a cylindrical quick-frozen container with dry ice spray is designed, the temperature field and velocity field of diced mango sprayed by dry ice in quick-freezing tank are simulated by COMSOL Multiphysics. The effects of different inlet velocities (0.15, 0.20, 0.25, 0.30, 0.35 and 0.40m/s)...

This paper presents the simulation results for dielectric barrier discharge (DBD) at atmospheric pressure in argon gas for different relative permittivity, granule shape, thickness layer, and granule diameter measurements for starch on the breakdown voltage. DBD is commonly utilized to generate cold plasma for starch modification. The electric fiel...

In this study, an all-optical multiplexer (Mux) based on elliptical insulator-metal-insulator (IMI) plasmonic waveguides is designed. The area of the proposed structure is very small (400 nm × 400 nm) which operates at a wavelength of 1,550 nm. The developed device utilizes constructive and destructive interferences between the input signals and th...

In this paper, a knittle pressure sensor was designed and fabricated by coating graphene/Polyvinylidene Fluoride nanocomposite on the knitted polyester substrate. The coating was carried out by a dip-coating method in a nanocomposite solution. The microstructure, surface properties and electrical properties of coated layers were investigated. The s...

In the article, the heat exchange process in the water tank battery, which acts as a wall between the livestock building and the solar greenhouse, is studied. The division consists of parallelepiped-shaped tanks, between which the coefficients of heat transfer in charge and discharge mode are determined, taking into account the different temperatur...

This paper presents the modeling results of tracer test simulations performed using COMSOL Multiphysics (version 6.1), a powerful software for multiphysics simulation. The simulations consist of the propagation of artificial tracers injected into different model configurations. This study is based on computational fluid dynamics (CFDs), which allow...

Corrosion significantly impacts the safety of steel structures, and neglecting its influence can lead to serious engineering accidents. In this study, a novel method for identifying the extent of corrosion on Q235 steel plates using Lamb waves is proposed. Numerical analysis of wave propagation on steel plates with varying corrosion depths and area...

To effectively prevent and control the spontaneous combustion disaster of open-air coal storage piles, applying the theory of coal spontaneous combustion mechanism, porous media heat transfer, and non-isothermal pipeline heat transfer, a method of arranging water-injected steel pipes in coal piles to prevent coal pile spontaneous combustion is prop...

p>The letter introduces the first highly miniaturized low-pass filter that combines the use of modal distortions, internal reflections, and magnetodielectric cover. The filter is implemented on an FR-4 printed circuit board with compact external dimensions of 17x14x0.25 (mm) covered with an elastic magnetodielectric material. We conducted electrody...

p>The letter introduces the first highly miniaturized low-pass filter that combines the use of modal distortions, internal reflections, and magnetodielectric cover. The filter is implemented on an FR-4 printed circuit board with compact external dimensions of 17x14x0.25 (mm) covered with an elastic magnetodielectric material. We conducted electrody...

Résumé : La présente étude évalue l’influence d’une toiture terrasse dans la régulation thermique des habitats en zone sahélienne en se basant sur une simulation thermiques dynamique. Les simulations sont réalisées sous COMSOL, logiciel de simulation Multiphysique résolvant les différentes équations par la méthode des éléments finis. Les résultats...

In this study, the effects of topological properties with local variable apertures on fluid flow and solute transport through three-dimensional (3D) discrete fracture networks (DFNs) were investigated. A series of 3D DFNs with different fracture density, length, and aperture distribution were generated. The fluid flow and solute transport through t...

The characteristics of nanomaterials have garnered significant attention in recent research on natural and forced convection. This study focuses on the forced convection characteristics of ternary nanofluids within convergent and divergent channels. The ternary nanofluid comprises titanium oxide (TiO 2), zinc oxide (ZnO), and silver suspended in wa...

Studying and determining the physical properties and hydraulic parameters of vadose zone sediments is an important key to evaluate the infiltration rate into them and assessing the extent to which aquifer sediments benefit from rainwater harvesting in arid and semi-arid areas. Due to the lack of sufficient data on the characteristics of this zone d...

Although permeation grouting technology has been widely used in engineering practice, there has not been sufficient research on how the distribution of pore sizes in porous media affects the diffusion of grout. In this study, based on the fractal theory of porous media and the Bingham fluid rheological equation, a Bingham fluid permeation grouting...

The present study introduces the first coupled model of the finite element method and Mie theory that predicts the heat transfer mechanism inside the expanded perlite vacuum insulation panels at a temperature range of 300-800 K. The finite element method is applied to discretise the governing equation of the steady state heat transfer and the three...