NANOSCALE AND MICROSCALE THERMOPHYSICAL ENGINEERING

Yang Cao, Tomoaki Kunugi, Xuhui Meng, Tianle Xie et al.

Flow boiling in a microchannel is numerically investigated by using an incompressible multiphase flow solver modified from the Open-source CFD solver OpenFOAM. The effects of inlet flow rate and applied heat flux on the bubble dynamics and heat transfer characteristics of flow boiling in microchannels are systematically analyzed. The simulations capture key features of microcha…

Juan Du, Kaiyin Xiao, Dongyu Li, Kaifan Du et al.

Abstract As electronic devices rapidly evolve towards higher power density and integration, the importance of efficient thermal management grows significantly. In the context of nano-reinforced thermoplastic composites, establishing effective thermal path through the filler network is crucial. In this study, by optimizing the ratios of two sizes of hexagonal boron nitride (h-BN…

Shanmugan Subramani, Gunasundari Raju, Mutharasu Devarajan

This study reports the synthesis, characterization, and performance evaluation of silver–copper-decorated reduced graphene oxide (AgCu-rGO) hybrid nanofillers embedded in natural rubber (NR) to develop multifunctional nanocomposite (NC) films with enhanced thermal and optical properties. AgCu-rGO hybrids were synthesized by chemical reduction and dispersed in NR latex at varyin…

Jingyi Cui, Jiewen Deng, Chuang Li, Zikang Yu

In this study, the evaporation of pure water and NaCl solution films under different electric fields was investigated using molecular dynamics, and the intrinsic mechanism of enhanced evaporation by electric fields was analyzed from the perspectives of forces and thermodynamics. The simulations showed that, apart from a slight inhibitory effect of a direct current electric fiel…

Shiquan Shan, Jining He, Haojin Wu, Ziying Cheng et al.

Due to the mismatch between solar spectrum and photovoltaic cells, solar thermophotovoltaic (TPV) technology attracts much interest. Near-field thermophotovoltaics (NFTPV) can further enhance radiation intensity and obtain optimized performance. This paper investigates the thermodynamic principles of solar NFTPV systems from the perspective of concentrating solar engineering. A…

A. Dwivedi, M. Veerabagu, N. Rajagopalan, S. Sinha

Heat storage for waste heat sources at 200–250 C, where most power is available, remains challenging due to the lack of suitable storage materials. Here, we explore thermochemical heat storage at these temperatures based on cobalt oxide/hydroxide chemistry under hydrothermal conditions that is uniquely closed to mass flows. The closed system removes the need to separate and sto…

Unmeelan Chakrabarti, Jeffrey S. Allen, Kishan Bellur

Kinetic theory is a popular approach to model liquid-vapor phase change but accurate determination of evaporation and condensation coefficients remains a challenge. Reported values of coefficients vary by several orders of magnitude. For simplicity and convenience evaporation and condensation coefficients are assumed to be equal though there is little physical evidence to suppo…

A.I. Krivchikov, A. Jeżowski, M.S. Barabashko, A.V. Dolbin et al.

We present a systematic investigation of the low-temperature heat capacity of thermally reduced graphene oxide (trGO), focusing on how compaction pressure and annealing temperature influence its vibrational behavior. Graphene oxide was synthesized using a modified Hummers method and subsequently reduced under vacuum at 300, 500, and 700°C, allowing for the controlled modificati…

Dulal Pal, Bhuban Chandra Das

This paper investigates the magnetohydrodynamic (MHD) heat and mass transfer characteristics of an electrically conducting micropolar fluid over a vertical stretching and shrinking sheets in a porous medium, accounting for variable thermal conductivity and mass diffusivity. The Runge-Kutta-Fehlberg method, combined with the shooting technique, is used to solve the non-similar g…

Mengzhu Ma, Xiangcheng Wu, Junxuan Guo, Jin Lu et al.

Based on the study of two-phase flow boiling heat transfer characteristics in rectangular microchannels, this paper proposes a novel mechanistic model for accurately predicting the heat transfer coefficient (HTC) in microchannels. Addressing the limitations of existing models in describing the liquid film evaporation process, the proposed model incorporates a bubble growth mech…

Saeed Mahmoud Al Shurafa, Firas Basim Ismail, Hussein A. Kazem, Tan Ee Sann et al.

Integrating thermoelectric generators (TEG) under photovoltaic (PV) panels in PV-TEG systems holds great potential for maximizing energy utilization by collecting waste heat from PV panels while increasing efficiency. However, the presence of air gaps at contact locations due to metal surface roughness presents a substantial issue, resulting in increased thermal contact resista…

Emlin V, Tide P. S.

In this era of ever reducing electronic component sizing, thermal management using Nano-encapsulated Phase Change Materials (nano-PCM) is gaining attention. This cooling technique utilizes latent heat absorption due to melting of nano-sized paraffin particles dispersed in a base-fluid. In the present study, a numerical model is developed based on Volume of Fluid multiphase mode…

Yan Wang, Jiaxin Liu, Li Li, Hongtao Pei et al.

The thermal conductivity of the interface between epoxy resin and graphene is important. Adding graphene to epoxy resin is an important way to improve the thermal conductivity of the interface and holds a long-term expectation for the related research. As a supplement, this work analyzed the effects of single vacancy (SV) defects, aluminum (Al) atom doped and doped around singl…

Tian Lan, Boyuan Song, Jimin Xu, Nan Xin et al.

Molybdenum disulfide (MoS2), a promising two-dimensional material, has attracted significant attention due to its unique electronic and thermal properties, making it a potential thermoelectric material Extensive research is underway to improve the thermoelectric properties of MoS2 by enhancing the figure of merit (ZT). However, there is currently limited research on the effects…

Amio Pronoy Das Ritwik, Md. Sajib Ali, Sheikh Mohammad Shavik, Mohammad Nasim Hasan

Liquid alkali metals hold great potential in applications requiring efficient heat transfer, such as nuclear power plants, solar energy systems, and process technology. Their high latent heat of vaporization and exceptional thermal conductivity make them promising alternatives to conventional heat transfer fluids like air, water, and molten salts. Understanding the phase change…

Tahta Amrillah, Le Thi Quynh, Farizi Rachman, Ahmad Taufiq et al.

Emergent exotic phenomena in the self-assembled process of vertically aligned nanocomposite (VAN) thin film remain under intensive studies. Insight exploration on the self-assembled formation from the combination of two different phases of materials is not only important to optimize the physical properties yields from those combined materials, but also open up a new avenue to d…

Riku Tomabechi, Ryusei Taniguchi, Takuma Hori

We employed phonon transport simulations to provide insights into the relation between the grain shape of polycrystalline nanostructures and their thermal conductivity. Two types of polycrystalline nanostructures were modeled by using space-filling structures: one comprised of only a single grain shape (body-centered cubic, face-centered cubic, and simple cubic), and the other …

Ankang Kan, Jiaxiang Zhang, Zhaofeng Chen, Hao Peng et al.

Aerogel with nano-aerogel structure is regarded as advanced thermal insulation material. Therefore, the impacts of their microstructure and physical features on thermal conductivity are vital for optimizing their fabrication. An improved random growth approach was proposed in this paper to theoretically derive the effective thermal conductivity (ETC) of nano-aerogel. This model…

Abdollah Goli, Iman Zahmatkesh, Seyed Reza Saleh, Seyed Mahmoud Abolhasan Alavi

MHD mixed convection heat transfer of an ionized gas in a vertical microchannel filled with a porous medium is simulated and discussed in this study. The considered flow is hydrodynamically and thermally developing with Local Thermal Non – Equilibrium (LTNE) between the gas and the solid matrix. The Darcy – Brinkman – Forchheimer model is utilized to describe the flow filed in …

Jihong Zhang, Haotuo Liu, Bing Yang, Zao Yi et al.

Near-field radiative heat transfer (NFRHT) between multilayer graphene/hBN heterostructures has been demonstrated to exceed the blackbody limit due to the coupling mechanism of surface plasmon polaritons and hyperbolic phonon polaritons, opening the door to applications in thermal management, thermophotovoltaics, and nanoscale metrology. Recent studies have shown that adding va…