Open Access
ARTICLE
Wenxia Zhu*, Baishu Chen, Lexin Wang, Chunxiang Wang
Frontiers in Heat and Mass Transfer, DOI:10.32604/fhmt.2024.047351
（This article belongs to the Special Issue: Heat and Mass Transfer in Fire)
Abstract A Solid Oxide Fuel Cell (SOFC) is an electrochemical device that converts the chemical energy of a substance into electrical energy through an oxidation-reduction mechanism. The electrochemical reaction of a solid oxide fuel cell (SOFC) generates heat, and this heat can be recovered and put to use in a waste heat recovery system. In addition to preheating the fuel and oxidant, producing steam for industrial use, and heating and cooling enclosed rooms, this waste heat can be used for many more productive uses. The large waste heat produced by SOFCs is a worry that must… More >
Open Access
ARTICLE
Marat Satayev1,2,*, Abdugani Azimov2, Arnold Brener2, Nina Alekseyeva1, Zulfia Shakiryanova2
Frontiers in Heat and Mass Transfer, DOI:10.32604/fhmt.2024.052901
（This article belongs to the Special Issue: Direct-Contact Heat and Mass Transfer Packings and Packed Beds)
Abstract The goal of this work is, first of all, to construct a mathematical model of the mass transfer process in porous adsorption layers, taking into account the fact that in most cases the adsorption process is carried out in non-stationary technological modes, which requires a clear description of its various stages. The scientific contribution of the novel model is based on a probability approach allowing for deriving a differential equation that takes into account the diffusion migration of adsorbed particles. Solving this equation allows us to calculate the reduced degree of the adsorption surface coverage… More >
Open Access
ARTICLE
Zhuo Liu, Yecui Yan*
Frontiers in Heat and Mass Transfer, DOI:10.32604/fhmt.2024.056091
（This article belongs to the Special Issue: Fluid Flow, Heat and Mass Transfer within Novel Cooling Structures)
Abstract The external rotor hub motor adopts direct drive mode, no deceleration drive device, and has a compact structure. Its axial size is smaller than that of a deceleration-driven hub motor, which greatly reduces the weight of the vehicle and increases the cruising range of the vehicle. Because of the limited special working environment and performance requirements, the hub motor has a small internal space and a large heat generation, so it puts forward higher requirements for heat dissipation capacity. For the external rotor hub motor, a new type of in-tank water-cooled structure of hub motor… More >
Open Access
ARTICLE
Lihui Zhang1, Huichuang Yang1, Weigang Li3, Jixin Xu3, Wei Zhou2, Donghui Wen4, Yanmin Zhang3,*
Frontiers in Heat and Mass Transfer, DOI:10.32604/fhmt.2024.052675
（This article belongs to the Special Issue: Two-phase flow heat and mass transfer in advanced energy systems)
Abstract Indoor heating with an electrical heating cable, which has no harmful emissions to the environment, is an attractive way for radiant floor heating. To improve the heat transfer efficiency, a novel structure of the heating cable was designed by proposing the concept of the aluminum finned sheath. The transient heat transfer model from the embedded heating cables to the floor is established to validate the feasibility of this novel cable. The effects of the fin number and shape on the cable’s temperature and heat flux distribution were analyzed. The results show that, with the specific More >
Graphic Abstract
Open Access
ARTICLE
Mahyar Kargaran*, Hamid Reza Goshayeshi, Ali Reza Alizadeh Jajarm
Frontiers in Heat and Mass Transfer, DOI:10.32604/fhmt.2024.056284
（This article belongs to the Special Issue: Multiscale Heat and Mass Transfer and Energy Conversion)
Abstract Solar energy is a valuable renewable energy source, and photovoltaic (PV) systems are a practical approach to harnessing this energy. Nevertheless, low energy efficiency is considered a major setback of the system. Moreover, high cell temperature and reflection of solar irradiance from the panel are considered chief culprits in this regard. Employing pulsating heat pipes (PHPs) is an innovative and useful approach to improving solar panel performance. This study presents the results of the power performance of a PV panel attached to a newly designed spiral pulsating heat pipe, while graphene oxide nanofluid with three More >
Open Access
ARTICLE
B. Ould Said1, F. Mebarek-Oudina2,*, M. A. Medebber3
Frontiers in Heat and Mass Transfer, DOI:10.32604/fhmt.2024.054164
（This article belongs to the Special Issue: Advances in Computational Thermo-Fluids and Nanofluids)
Abstract In this work, a steady mixed convection in a two-dimensional enclosure filled viananoliquid Cu/H2O through a porous medium was numerically analyzed. The nanoliquid flow is designated utilizing the Brinkman-Forchheimer model. The upper and the bottom horizontal walls are considered to be hot (Th) and cold temperature (Tc), respectively, whereas the other walls are thermally insulated. The impact of various dimensionless terms such as the Grashof number (Gr) in the ranges (0.01–20), the Reynolds number (Re) in the ranges (50–500), the Hartman number (Ha) in the ranges (0–20), and three different location cases (0.25, 0.5, and More >
Open Access
ARTICLE
Fayi Yan*, He Lu, Shijie Feng
Frontiers in Heat and Mass Transfer, DOI:10.32604/fhmt.2024.055324
（This article belongs to the Special Issue: Two-phase flow heat and mass transfer in advanced energy systems)
Abstract Helically coiled tube-in-tube (HCTT) heat exchangers are widely applied to the process technology because of their compactness and higher heat transfer efficiency. HCTT heat exchangers play an important role in liquified natural gas (LNG) use and cold energy recovery. The heat transfer characteristics, pressure distribution, and degree of vaporization of LNG in HCTT heat exchangers are numerically investigated. By comparing the simulation results of the computational model with existing experimental results, the effectiveness of the computational model is verified. The numerical simulation results show the vapor volume fraction of the HCTT heat exchanger is related… More >
Open Access
ARTICLE
Sahar Anwar1, Ghulam Rasool2,*, Muhammad Ashraf1, Uzma Ahmad1, Tao Sun2,*
Frontiers in Heat and Mass Transfer, DOI:10.32604/fhmt.2024.055314
（This article belongs to the Special Issue: Fluid Flow, Heat and Mass Transfer within Novel Cooling Structures)
Abstract The present investigation centers on the impact of viscous dissipation and ohmic heating on the plume generated by a line heat source under the impact of an aligned magnetic field. In this study, the flow model is adapted to incorporate ohmic heating and viscous dissipation by including the respective terms in the energy equation. A mathematical model is formulated as a system of coupled partial differential equations to analyze the flow problem. Subsequently, a numerical solution is derived with stream function formulation for the system of coupled partial differential equations, which transmutes it into ordinary… More >
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