Open Access

ARTICLE

Lei Xing¹, Haonan Huang², Mingyang Sun², Dongyue Jiang^2,*, Qiang He^1,*
Frontiers in Heat and Mass Transfer, Vol.24, No.1, 2026, DOI:10.32604/fhmt.2026.075774 - 28 February 2026
（This article belongs to the Special Issue: Enhancement Technologies for Fluid Heat and Mass Transfer)
Abstract In response to the actual demands of the energy storage type organic Rankine power generation cycle, this study proposes a new type of jacketed shell and tube heat exchanger with integrated cold storage and heat exchange. N-tedecane is selected as the phase change material for cold storage, low-temperature water as the cold source, and R134a as the heat source. The phase change material for cold storage is filled inside the jacket tube of the heat exchanger. Cold fluid is introduced into the inner tube to cause the phase change material to condense and store cold.… More >

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REVIEW

Muhammad Waheed Azam^1,*, Uzair Sajjad^2,*, Faisal Maqbool³, Giovani Sempirini⁴
Frontiers in Heat and Mass Transfer, Vol.24, No.1, 2026, DOI:10.32604/fhmt.2025.074690 - 28 February 2026
Abstract Heat exchangers play a crucial role in thermal energy systems, with their performance directly impacting efficiency, cost, and environmental impact. A powerful technique for performance improvement can be given by passive enhancement strategies, which are characterized by their dependability and minimal external power requirements. This comprehensive review critically assesses recent advancements in such passive methods to evaluate their heat transfer mechanisms, performance characteristics, and practical implementation challenges. Our methodology involves a systematic and comprehensive analysis of various heat transfer enhancement techniques, including surface modifications, extended surfaces, swirl flow devices, and tube inserts. This approach synthesizes… More >

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ARTICLE

Hao Zhu^1,2, Xi Chen^1,2,*, Pengcheng Qu^1,2, Yifan Zhu^1,2, Haoyi Wang^1,2, Yingxia Qi^1,2
Frontiers in Heat and Mass Transfer, Vol.24, No.1, 2026, DOI:10.32604/fhmt.2026.076127 - 28 February 2026
Abstract Pulse tube cryocoolers are widely employed in cryogenic systems, where gas contamination has become a critical factor limiting both performance and service life. To further investigate the condensation behavior of contaminants, this study develops a two-dimensional axisymmetric model of a linear-type cryocooler to simulate the transport and deposition processes of trace CO₂, evaluating the impact of contamination on system pressure drop under various operating conditions. Results indicate that CO₂ diffusion is primarily driven by concentration gradients. The CO₂ deposition rate increases markedly at low temperatures and high concentrations, with over 90% of deposition occurring in the cold-end… More >

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ARTICLE

Wei Dong¹, Xuqing Feng², Taoxiang Mei², Xiang Li², Zhenzong He^2,3,*
Frontiers in Heat and Mass Transfer, Vol.24, No.1, 2026, DOI:10.32604/fhmt.2026.075846 - 28 February 2026
Abstract The proton exchange membrane fuel cell (PEMFC) and the hydrogen hybrid power system are studied by the fuzzy-PID (FPID) control method and the fuzzy-PID control method by Artificial Bee Colony algorithm (ABC-FPID), respectively. The results reveal that compared with the FPID control method, the temperature overshoot of the PEMFC stack under the ABC-FPID control method is decreased by 0.6%. Moreover, the circulating water flow rate within the full operating envelope (about 3 min) is reduced by 19.46 L, which means the ABC-FPID control method is more effective in regulating the stack temperature. Then, the ABC-FPID… More >

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ARTICLE

M. Faizan¹, Syed Sohaib Zafar², Farhan Ali¹, Umair Khan^3,4, Aurang Zaib⁵, Najiyah Safwa Khashi’ie^6,*
Frontiers in Heat and Mass Transfer, Vol.24, No.1, 2026, DOI:10.32604/fhmt.2026.075018 - 28 February 2026
（This article belongs to the Special Issue: Heat and Mass Transfer in Nanofluid Boundary Layers: Modeling, Simulation, and Applications)
Abstract The purpose of the present investigation is to explore the implications of Cross fluid in a Darcy-Forchheimer porous medium due to the tri-hybrid nanofluid past a porous cylinder. Thermal radiation, heat generation, thermal convection, solutal convective and chemical reaction have been encountered in this analysis. Entropy generation has been accounted for under the fluidic friction, heat rate analysis, and porosity analysis. Three different nanoparticles of multiwall carbon nanotube (MWCNT), aluminum oxide (Al2O3), and silver (Ag) are utilized to illustrate the tri-hybrid nanofluid flow with Ethlene Glycol (EG) as the base fluid. The governance… More >

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ARTICLE

Geqiang Li^1,2, Kai Wang¹, Juntao Liu³, Zhengyang Han^1,2, Shuai Wang^1,2,*, Donglin Li^1,2
Frontiers in Heat and Mass Transfer, Vol.24, No.1, 2026, DOI:10.32604/fhmt.2025.075249 - 28 February 2026
Abstract To explore the distribution law of the temperature field in the motor pump and the influence of the fan-shaped DC channel with spoiler in the pump housing on its heat dissipation performance. This study takes the arc-gear type hydraulic motor pump as the research object. In COMSOL, a coupled heat transfer simulation model of the motor pump’s fluid-solid coupling is established, and the internal temperature field characteristics are analyzed. To improve the heat dissipation effect of the motor pump, it is proposed to arrange spoiler in the fan-shaped DC channel of the pump housing to… More >

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ARTICLE

Taher Maatallah^1,*, Nagmeldeen A. M. Hassanain¹, Gaydaa Al Zohbi², Farooq Saeed¹, Muhammad Saleem¹, Nassir Hariri¹, Mohamed Elsharawy³, Tapas Kumar Mallick^1,4, Fahad Gallab Al-Amri¹
Frontiers in Heat and Mass Transfer, Vol.24, No.1, 2026, DOI:10.32604/fhmt.2026.075763 - 28 February 2026
Abstract High-concentration photovoltaic (HCPV) systems present significant thermal management challenges due to the intense heat fluxes generated under concentrated solar irradiation, especially in arid environments. Effective heat dissipation is critical to prevent performance degradation and structural failure. This study investigates the thermal performance and design optimization of an enhanced HCPV module, integrating numerical, analytical, and experimental methods. A coupled optical-thermal-electrical model was developed to simulate ray tracing, heat transfer, and temperature-dependent electrical behaviour, with predictions validated under real-world desert conditions. Compared to a baseline commercial module operating at 106°C, the optimized design achieved a peak temperature More >

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ARTICLE

Luling Li¹, Minghui Li², Zhengxiang Xu², Haofeng Lin², Xuemei Lang², Peiming Li¹, Hengrong Zhang^1,*, Dongxu Ji^3,*, Jian Liu¹, Jianhui Liu¹, Guang Yang¹, Shuanshi Fan^2,*
Frontiers in Heat and Mass Transfer, Vol.24, No.1, 2026, DOI:10.32604/fhmt.2026.075692 - 28 February 2026
Abstract This study addresses the energy-intensive challenge of small-scale biogas upgrading by optimizing a chemical absorption process employing methyl diethanolamine (MDEA). Focusing on a typical distributed application of 300 Nm³/d, we developed an integrated simulation-optimization framework using Aspen HYSYS 14.0 to systematically evaluate the effects of critical operating parameters—absorption pressure, MDEA concentration, flow rate, temperature, number of trays, and reboiler duty—on methane purity and energy consumption. The key finding is the identification of an optimal parameter set: absorption pressure of 1200 kPa, MDEA concentration of 20 mol%, lean flow rate of 2.5 kmol/h, temperature of 298.15 K,… More >

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ARTICLE

E. V. Macias-Melo¹, P. R. Torres-Hernández², K. M. Aguilar-Castro¹, I. Hernández-Pérez¹, P. García-Alamilla³, C. E. Torres-Aguilar¹, M. I. Hernández-López⁴, S. Medina García⁴, J. Serrano-Arellano^4,*
Frontiers in Heat and Mass Transfer, Vol.24, No.1, 2026, DOI:10.32604/fhmt.2025.074900 - 28 February 2026
Abstract This study presents the design, construction, and thermal evaluation of a solar-powered cocoa roaster based on a Parabolic Cylinder Collector (PCC) with dual-axis solar tracking. The system integrates three functional subsystems: the cylindrical-parabolic reflecting surface, the stainless-steel absorber tube, and a microcontroller-based tracking mechanism. The prototype enables continuous acquisition of key thermal variables (solar irradiance, ambient temperature, absorber surface temperature, and bean temperature), allowing a detailed characterization of heat transfer processes during roasting. Roasting experiments were conducted at controlled durations of 40, 55, and 70 min between 10:00 and 14:00 h. Maximum roasting temperatures of… More >

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111

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ARTICLE

Kai Song¹, Lishan Feng¹, Shugang Duan¹, Weilong Zhao², Haikun Zheng^3,*
Frontiers in Heat and Mass Transfer, Vol.24, No.1, 2026, DOI:10.32604/fhmt.2025.074404 - 28 February 2026
（This article belongs to the Special Issue: Advances in Microscale Fluid Flow, Heat Transfer, and Phase Change)
Abstract This study experimentally investigates the influence of surface wettability on the frosting characteristics of three types of corrugated structures (Types A, B, and C) under controlled low-temperature conditions. The experiments were conducted in a constant-temperature bath at a cold surface temperature of –5°C, relative humidity of 90%, and ambient air temperature of 10°C. The results reveal that the variation trends of frost morphology, frost mass, and frost layer thickness are generally consistent across surfaces with different wettability. Among the tested surfaces, frost crystal formation and complete surface coverage occurred latest on the superhydrophobic surface (CA =… More >

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200

Open Access

ARTICLE

Yumeng Li, Fuyong Su^*
Frontiers in Heat and Mass Transfer, Vol.24, No.1, 2026, DOI:10.32604/fhmt.2026.076007 - 28 February 2026
（This article belongs to the Special Issue: Advances in Heat Exchanger Design, Performance, and Applications)
Abstract Based on the Fluent numerical simulation method, this study systematically analyzed the structural parameters of the spiral tube heat exchanger and the influence of the external baffle on its heat transfer performance. The results show that when the equivalent diameter of the spiral tube increased from 16.68 to 21.23 mm, its surface heat transfer coefficient decreased from 22,040 to 17,230 W/m²·K, and the outlet air temperature dropped from 822.3 to 807.3 K. However, the pressure loss decreased from 2.692 to 0.958 kPa. which reveals the contradiction between the heat transfer efficiency and the flow resistance. By More >

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ARTICLE

Yendoubouame Lare^1,2,*, Koffi Sagna^1,2, Amah Séna d’Almeida³
Frontiers in Heat and Mass Transfer, Vol.24, No.1, 2026, DOI:10.32604/fhmt.2025.074506 - 28 February 2026
（This article belongs to the Special Issue: Heat and Mass Transfer on A Small Temporal and Spatial Scale)
Abstract This study presents a numerical investigation of the transient relaxation dynamics of a near-critical CO₂ droplet immersed in a warmer supercritical environment composed of the same fluid. Three thermodynamic regimes were analysed: quasi-critical (Tr=1.01,Pr=1.01), transitional (Tr=2.01,Pr=1.01), and deep supercritical (Tr=5.01,Pr=3.01). The evolution of density, temperature, and velocity fields was examined to characterize the internal structure and stability of the interfacial transition layer. The evolution of density, temperature, and velocity fields highlights the competition between thermal diffusion, compressibility, and mass confinement in shaping the stability of the interfacial transition layer. Near the critical point, strong More >

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ARTICLE

Josmell Alva Alcántara¹, Elder Mendoza Orbegoso¹, Nattan Roberto Caetano², Luis Julca Verástegui¹, Juan Bengoa Seminario¹, Jimmy Silvera Otañe¹, Yvan Leiva Calvanapón¹, Giulio Lorenzini^3,*
Frontiers in Heat and Mass Transfer, Vol.24, No.1, 2026, DOI:10.32604/fhmt.2025.074995 - 28 February 2026
Abstract The continuous improvement of solar thermal technologies is essential to meet the growing demand for sustainable heat generation and to support global decarbonization efforts. This study presents the design, implementation, and validation of a real-time monitoring framework based on the Internet of Things (IoT) and cloud computing to enhance the thermal performance of evacuated tube solar water heaters (ETSWHs). A commercial system and a custom-built prototype were instrumented with Industry 4.0 technologies, including platinum resistance temperature detectors (PT100), solar irradiance and wind speed sensors, a programmable logic controller (PLC), a SCADA interface, and a cloud-connected… More >

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175

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ARTICLE

Zheming Cheng^1,*, Xinping OuYang², Leren Tao², Zihao Wang², Ke Sun²
Frontiers in Heat and Mass Transfer, Vol.24, No.1, 2026, DOI:10.32604/fhmt.2025.074325 - 28 February 2026
Abstract Energy shortage has become one of the most concerning issues in the world today, and improving energy utilization efficiency is a key area of research for experts and scholars worldwide. Small-diameter heat exchangers offer advantages such as reduced material usage, lower refrigerant charge, and compact structure. However, they also face challenges, including increased refrigerant pressure drop and smaller heat transfer area inside the tubes. This paper combines the advantages and disadvantages of both small and large-diameter tubes and proposes a combined-diameter heat exchanger, consisting of large and small diameters, for use in the indoor units… More >

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245

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ARTICLE

Anandhi C.¹, Narsu Sivakumar^1,*, Revathi Devi M.²
Frontiers in Heat and Mass Transfer, Vol.24, No.1, 2026, DOI:10.32604/fhmt.2026.075232 - 28 February 2026
（This article belongs to the Special Issue: Advances in Heat and Mass Transfer: Integrating Numerical Methods with Artificial Intelligence, Machine Learning, and Data-Driven Approaches)
Abstract This work explores a Magnetohydrodynamic (MHD) flow in a triangular cavity with a thermally insulated baffle. Enclosure’s inclined wall is hotter, whereas the vertical border is adiabatic and the bottom is cooler. The study aims to clarify how geometric changes affect thermal performance and offers new perspectives on how to improve heat dissipation mechanisms. A COMSOL Multiphysics version 6.2 has been used to solve numerical solutions. Streamlines and thermal distributions are examined systematically in order to understand how the unique geometry and baffle size of triangular cavities can influence the fluid flow. This influence can More >

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ARTICLE

Jin Huang¹, Zihao Tang¹, Tingting Wu¹, Hualiang Li², Yanxin Hu^1,*
Frontiers in Heat and Mass Transfer, Vol.24, No.1, 2026, DOI:10.32604/fhmt.2026.075643 - 28 February 2026
（This article belongs to the Special Issue: Innovations in Drying Technologies: Bridging Industrial, Environmental, and Energy Efficiency Challenges)
Abstract In order to explore the effects of CaO, lignite dust and sawdust on the drying characteristics of municipal sludge at different concentrations, a three-factor three-level regression experiment was carried out based on the results of thermogravimetric experiment and single factor experiment. By fitting three common mathematical models, the Page model with the highest fitting degree was selected to determine the most suitable mathematical model to describe the municipal sludge drying process. In addition, the Box-Behnken design principle in the response surface method was used to analyze the interaction of three factors on the drying characteristics… More >

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ARTICLE

M. A. Vega Navarrete^1,*, P. J. Argumedo Teuffer¹, C. M. Rodríguez Román¹, L. E. Marrón Ramírez², E. A. Islas Narvaez¹
Frontiers in Heat and Mass Transfer, Vol.24, No.1, 2026, DOI:10.32604/fhmt.2026.076095 - 28 February 2026
（This article belongs to the Special Issue: Innovative Cooling Systems: Design, Optimization, and Applications)
Abstract This article presents an adaptive intelligent control strategy applied to a lumped-parameter evaporator model, i.e., a simplified dynamic representation treating the evaporator as a single thermal node with uniform temperature distribution, suitable for control design due to its balance between physical fidelity and computational simplicity. The controller uses a wavelet-based neural proportional, integral, derivative (PID) controller with IIR filtering (infinite impulse response). The dynamic model captures the essential heat and mass transfer phenomena through a nonlinear energy balance, where the cooling capacity “Qevap” is expressed as a non-linear function of the compressor frequency and the… More >

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ARTICLE

Luca Giammichele^*, Valerio D’Alessandro, Matteo Falone, Renato Ricci
Frontiers in Heat and Mass Transfer, Vol.24, No.1, 2026, DOI:10.32604/fhmt.2026.072535 - 28 February 2026
（This article belongs to the Special Issue: Heat and Mass Transfer Applications in Engineering and Biomedical Systems: New Developments)
Abstract The airborne diffusion of saliva droplets during respiratory activities is one of the major factors in the spread of infections. During the COVID-19 pandemic, the use of protective face masks was essential to reduce the risk of infection and spread of SARS-CoV-2. The face mask is able to significantly reduce the saliva droplet emission in front of the person. However, the use of masks also produces a particle leakage towards the back of the person, which could increase the infection risk of people behind the subject. Most of the experimental investigations applied invasive and/or complex… More >

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