Shailesh I. Kundalwal

University of Toronto | U of T · Department of Mechanical and Industrial Engineering

In this work, we studied the hydrogen adsorption capabilities of functionalized graphene sheets containing a variety of defects (D-G) via molecular dynamics (MD) simulations that govern the mechanisms involved in hydrogen adsorption. Specifically, the graphene sheets containing monovacancy (MV), Stone-Wales (SW), and multiple double vacancy (DV) de...

The current research presents geometrical effective thermal conductivity(ETC) models for externally coated open-cell metal foams (MFs) saturated with fluid/phase change material (PCM) by considering three-dimensional configuration adopted from the tetrakaidecahedron structure. The three-dimension(3D) models consider different geometries, such as he...

Exploiting the boundless potential of multi-walled carbon nanotubes (MWCNTs) is the critical issue in developing multifunctional nanocomposites. In this study, the MWCNTs are exfoliated by ZrO 2 nanoparticles using the ultrasonication technique. The obtained MWCNT/ZrO 2 hybrid nanofiller is infused in the epoxy matrix to produce multifunctional nan...

Hybrid nanofillers consisting of MWCNT (multiwalled carbon nanotubes) functionalized by ZrO 2 nanopar-ticles have been infused in an epoxy matrix to fabricate MWCNT/ZrO 2 hybrid epoxy nanocomposites (MNC) using an ultrasonication mixing technique. The structural morphology of the hybrid nanofillers and their dispersion in the epoxy matrix, were stu...

Present paper reports the thermal performance of phase change material (PCM) based heat sinks (HSs) with foams (metallic and non-metallic) and HS with fins and without fins. The effect of volume fraction of thermal conductivity enhancer (TCE), volume fraction of PCM, and input heat flux values (q″ = 1.5–2.5 kW/m²) on the performance of PCM-based HS...

Hybrid nanofillers consisting of MWCNT (multiwalled carbon nanotubes) functionalized by ZrO 2 nanoparticles have been infused in an epoxy matrix to fabricate MWCNT/ZrO 2 hybrid epoxy nanocomposites (MNC) using an ultrasonication mixing technique. The structural morphology of the hybrid nanofillers and their dispersion in the epoxy matrix, were stu...

In recent years phase change materials (PCMs) have emerged as a promising material for various thermal management applications. However, the lower thermal conductivity of PCM is a major hindrance in its widespread use. In the present study, an experimental investigation is carried out using high thermal conductive carbon foam (CF) embedded with PCM...

This paper presents an experimental study to investigate the effect of inclination angle on the thermal performance of phase change material (PCM) based heat sinks without and with plate fins. Paraffin wax with melting temperature range 58–62 °C is used as PCM. Three different heat flux values such as 1.3, 2.0 and 2.7 kW/m2 are chosen to analyze th...

The design of thermal management system needs to be made in such a way that can avoid the possible overheating and failure of electronic components because of higher power density. Thermal performance of heat sink (HS) configurations involving different number of cavities (1, 4, 9, 16, 25, and 36), formed by cross plate fins arrangement, as applica...

Present paper reports the thermal performance of various phase change material (PCM)‐based heat sinks during melting process for cooling of portable electronic devices through experimental investigations. Heat sink configurations include unfinned with pure PCM, finned with pure PCM, unfinned with metallic foam (MF)–PCM composite, and finned with MF...

Selection of proper phase‐change material (PCM) plays a crucial role in the development of latent heat thermal management module. Very often, selection of improper material leads to early failure of the product which results in huge economic loss. Most of the researchers utilize PCM in a particular application based on their experience and availabi...

Carbon nanotube (CNT) acts as the most promising nanofiller due to its high aspect ratio and exceptional nanoscale-level properties. However, the dispersibility of CNTs in the conventional polymer matrices is a very critical issue in developing the high-strength and light-weight polymer-based nanocomposites. In this study, an attempt was made to de...

Present study is focused on the computational analysis of melting of PCM inside the spherical capsule. Both unconstrained and constrained melting is analyzed for the constant PCM volume and similar initial and boundary conditions. RT27 is chosen as the PCM for this study. Air is considered at the top of PCM inside the spherical capsule. Results are...

The temperature-dependent transversely isotropic elastic properties of multi-walled boron nitride nanotubes (MWBNNTs) were determined using molecular dynamics simulations with a three-body Tersoff potential force field. These elastic properties were calculated by applying the four different loading conditions on MWBNNTs: uniaxial tension, torsional...

Although carbon nanotubes (CNTs) have displayed great potential for enhancement of multifunctional properties of a polymer matrix, still incorporation of CNTs with the polymeric matrices requires further improvement in terms synthesis, processing, functionalization etc. In this study, we decorated the surfaces of multi‐walled CNTs (MWCNTs) by zirco...

Present experimental investigation focuses on implementing passive cooling thermal management technique using heat sinks filled with paraffin wax as phase change material (PCM). Al2O3 nanoparticles are dispersed as thermal conductivity enhancer (TCE) in different weight fractions (φ) for improved performance in the PCM. Unfinned and two finned heat...

A one-dimensional conduction heat transfer model has been proposed to study the melting and solidification of phase change material (PCM) inside an annulus. Here, the phase change process is divided into two main sub-processes such as melting and solidification sub-process. Subsequently, each sub-process is analyzed for various temporal regimes. Th...

Here, a simplified analytical model has been proposed to predict solid fraction, solid-liquid interface, solidification time, and temperature distribution during solidification of phase change material (PCM) in a two-dimensional latent heat thermal energy storage system (LHTES) with horizontal internal plate fins. Host of boundary conditions such a...

In the present experimental study, an attempt has been made to study the effect of inclination angle on the thermal performance of phase change material (PCM) based heat sinks with and without plate fins. Heat flux value of 2.0 kW/m2 is chosen for the present study. Experiments are performed with various inclination angles such as 0°, 45° and 90°....

In the present experimental study, an attempt has been made to study the efficient thermal management system based on phase change material for cooling of portable electronic devices. Paraffin wax is used as PCM to keep the temperature of electronic devices below critical temperature by absorbing thermal energy released by electronic components. PC...

An analytical model has been proposed for thermal management of electric vehicle battery modules with phase change material (PCM). Present model considers the melting analysis of the PCM. In this model, the entire phase change process is divided into three stages such as: completely solid PCM, partially molten PCM and completely liquid PCM. In all...

Latent heat thermal energy storage (LHTES) has been receiving considerable attention in recent years because of high storage density and isothermal phase transition. In this study, an analytical model has been proposed for prediction of solid-liquid interface and temperature during solidification of phase change material (PCM) in a two dimensional...

This article deals with the prediction of thermomechanical properties of fiber reinforced composites using several micromechanics models. These include strength of material approach, Halpin–Tsai equations, multi-phase mechanics of materials approaches, multi-phase Mori–Tanaka models, composite cylindrical assemblage model, Voigt–Reuss models, modif...

This article reports modeling of effective thermomechanical properties of multifunctional carbon nanotube (CNT)-reinforced hybrid polymeric composites (hereafter, it is referred as “fuzzy fiber composite”). The novel constructional feature of fuzzy fiber composite (FFC) is that nanoscale CNTs are radially grown on the circumferential surfaces of mi...

This paper is concerned with the analysis of active constrained layer damping (ACLD) of geometrically nonlinear vibrations of doubly curved sandwich shells with facings composed of fuzzy fiber reinforced composite (FFRC). FFRC is a novel composite where the short carbon nanotubes (CNTs) which are either straight or wavy are radially grown on the pe...

Flexoelectricity phenomenon is the response of electric polarization to an applied strain gradient and is developed as a consequence of crystal symmetry in all materials. In this study, we show that the presence of strain gradient in non-piezoelectric graphene sheet does not only affect the ionic positions, but also the asymmetric redistribution of...

This article deals with the multiscale modeling of stress transfer characteristics of nano-reinforced polymer composite reinforced with regularly staggered carbon fibers. The distinctive feature of construction of nano-reinforced composite is such that the microscale carbon fibers are packed in hexagonal array in the carbon nanotube reinforced poly...

In this work, an improved shear lag model was developed to investigate the interfacial characteristics of three-phase hybrid nanocomposite which is reinforced with microscale fibers augmented with carbon nanotubes on their circumferential surfaces. The shear lag model accounts for (i) radial and axial deformations of different transversely isotropi...

This study is focused on the mechanical properties and stress transfer behavior of multiscale composites containing nano- and micro-scale reinforcements. The distinctive feature of construction of this composite is such that the carbon nanostructures (CNS) are dispersed in the matrix around the continuous microscale fiber to modify microfiber-matri...

In this work, we developed an improved shear lag model to investigate the load transfer characteristics of three-phase nanocomposite which is reinforced with microscale fibers augmented with carbon nanotubes on their circumferential surfaces. The shear lag model accounts for (i) radial and axial deformations of different transversely isotropic cons...

This chapter deals with the investigation of the effect of carbon nanotube (CNT) waviness on the effective elastic properties of a novel continuous fuzzy fiber-reinforced composite (FFRC). Effective elastic properties of this composite estimated by the mechanics of materials (MOM) approach have been compared with those predicted by the Mori-Tanaka...

Due to its exceptionally outstanding electrical, mechanical and thermal properties, graphene is being explored for a wide array of applications and has attracted enormous academic and industrial interest. Graphene and its derivatives have also been considered as promising nanoscale fillers in gas barrier application of polymer nanocomposites (PNCs)...

In this article, we investigate the effect of carbon nanotube (CNT) waviness on the active constrained layer damping (ACLD) of the laminated hybrid composite shells. In particular, the effect of CNT waviness has been studied for the case of a novel nano-tailored composite—continuous fuzzy fiber-reinforced composite (FFRC). The distinctive feature o...

This article deals with the investigation of the effect of carbon nanotube (CNT) waviness on the effective thermal conductivities of a novel fuzzy fiber-reinforced composite (FFRC). The distinctive feature of the construction of this novel FFRC is that wavy CNTs are radially grown on the circumferential surfaces of the carbon fibers. Effective ther...

In this article, we investigate the stress transfer characteristics of a novel hybrid hierarchical nanocomposite in which the regularly staggered short fuzzy fibers are interlaced in the polymer matrix. The advanced fiber augmented with carbon nanotubes (CNTs) on its circumferential surface is known as “fuzzy fiber.” A three-phase shear lag model i...

This article is concerned with the investigation of active constrained layer damping (ACLD) of smart laminated fuzzy fiber reinforced composite (FFRC) plates. The distinctive feature of the construction of this novel FFRC is that the uniformly spaced short carbon nanotubes (CNTs) are radially grown on the circumferential surfaces of carbon fibers....

The effect of waviness of carbon nanotubes (CNTs) on the load transfer characteristics of the short fuzzy fiber-reinforced composite (SFFRC) has been studied, considering the wavy CNTs to be coplanar with either of the two mutually orthogonal planes. The distinct constructional feature of this composite is that the uniformly spaced wavy CNTs are ra...

Abstract A novel short fuzzy fiber-reinforced composite (SFFRC) in which the aligned short carbon fiber reinforcements are coated with radially aligned carbon nanotubes (CNTs) is considered in this study. A three phase shear lag model considering radial and axial deformations of the different constituent phases of the SFFRC has been developed to an...

The effective thermal conductivities of a novel fuzzy fiber reinforced composite (FFRC) have been determined by employing the effective medium approach in conjunction with the composite cylinder assemblage approach. The novel constructional feature of this FFRC is that the uniformly spaced carbon nanotubes (CNTs) are radially grown on the circumfer...

The elastic response of a novel short fuzzy fiber-reinforced composite (SFFRC) has recently been investigated by Kundalwal and Ray [Mechanics of Materials 53 (2012), 47–60]. The distinctive feature of the construction of this novel SFFRC is that straight carbon nanotubes (CNTs) are radially grown on the circumferential surfaces of unidirectional sh...

The present study is concerned with the active control layer damping (ACLD) of the geometrically nonlinear vibrations of the smart functionally graded (FG) sandwich plates subjected to the thermal loading. The constraining layer of the ACLD treatment is considered to be made of the vertically/obliquely reinforced 1-3 piezoelectric composite (PZC) w...

A new fuzzy carbon fiber heat exchanger (FFHE) with carbon nanotubes (CNTs) is proposed in the present study. A novel constructional feature of the FFHE is that the uniformly spaced CNTs are radially grown on the outer circumferential surface of the hollow cylindrical carbon fiber (HCF). The effective thermal conductivities of a novel FFHE have bee...

This paper deals with the investigation of active constrained layer damping (ACLD) of smart laminated continuous fuzzy fiber reinforced composite (FFRC) shells. The distinct constructional feature of a novel FFRC is that the uniformly spaced short carbon nanotubes (CNTs) are radially grown on the circumferential surfaces of the continuous carbon fi...

The effective thermoelastic properties of a fuzzy fiber-reinforced composite (FFRC) have been estimated by employing the generalized method of cells approach and the Mori–Tanaka method. The novel constructional feature of this fuzzy fiber-reinforced composite is that the uniformly aligned carbon nanotubes (CNTs) are radially grown on the circumfere...

A fuzzy fiber reinforced composite (FFRC) reinforced with wavy zig-zag single-walled carbon nanotubes (CNTs) and carbon fibers is analyzed in this study. The distinct constructional feature of this composite is that the wavy CNTs are radially grown on the surface of carbon fibers. To study the effect of the waviness of CNTs on the elastic propertie...

A novel fuzzy fiber reinforced composite (FFRC) reinforced with zig-zag single-walled carbon nanotubes (CNTs) and carbon fibers is proposed. The distinct constructional feature of this composite is that the uniformly aligned CNTs are radially grown on the surface of carbon fibers. Analytical models based on the mechanics of materials approach and t...