Article
Energy & Fuels
Devendra Raut, Suraj Londhe, V. R. Kalamkar
Summary: This study investigated the effect of connection and flow parameters during charging and discharging processes, finding that the series arrangement is better than the parallel arrangement under all flow conditions.
JOURNAL OF ENERGY STORAGE
(2022)
Article
Thermodynamics
Vahid Safari, Babak Kamkari, Kamel Hooman, J. M. Khodadadi
Summary: This study investigates the effect of fins on the thermal performance of vertically- and horizontally-oriented rectangular storage tanks. The results show that longer and thinner fins are more beneficial for enhancing the melting rate, and increasing the number of fins in horizontal tanks does not necessarily shorten the melting time.
Article
Energy & Fuels
Debabrata Panda, Krunal M. Gangawane
Summary: This study presents the synthesis and characterization of hybrid nanoparticles-based phase change material (HNbPCM) and its application in a pin-fin heat sink system. The hybrid nanoparticles of NiCo-NiFe were synthesized using the sol-gel method and dispersed in paraffin wax and polyethylene glycol-6000 eutectic organic PCMs. The thermal stability, conductivity, and charging and discharging characteristics of the HNbPCM composites were analyzed. The addition of hybrid NiCo-NiFe nanoparticles at a concentration of 3 wt% showed promising enhancement in thermophysical properties and improved thermal performance in the heat sink system.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Thermodynamics
Bingkun Huang, Shimi Yang, Enyi Hu, Xiuxiu Li, Jun Wang, Peter Lund
Summary: This paper establishes a mathematical model to explain the melting process of PCM affected by natural convection, introducing a coordination factor Co to explain the melting process. The study finds that Co is closely related to the melting rate, promoting the melting rate when Co is greater than 0. The research provides theoretical guidance for enhancing phase change heat storage.
CASE STUDIES IN THERMAL ENGINEERING
(2021)
Article
Green & Sustainable Science & Technology
A. Ghanbarpour, M. J. Hosseini, A. A. Ranjbar, M. Rahimi, R. Bahrampoury, M. Ghanbarpour
Summary: This paper presents a numerical study on heat sink thermal performance using phase change materials (PCM) and a vapor chamber for heat source cooling, finding that in natural convection, adding PCM and vapor chamber effectively reduces the heat source temperature, while in forced convection, the vapor chamber has a more significant effect and adding PCM may adversely affect heat sink performance.
Article
Energy & Fuels
Alireza Jaberi Khosroshahi, Siamak Hossainpour
Summary: Applying Phase Change Materials (PCMs) in Thermal Energy Storage (TES) systems and utilizing storage rotation method can increase the efficiency of renewable energy utilization and accelerate the charging process. The study shows that utilizing step-by-step rotation scenario can reduce the charging time by 15.5% compared to the fixed mode.
JOURNAL OF ENERGY STORAGE
(2021)
Review
Energy & Fuels
Debasree Ghosh, Joyjeet Ghose, Pulak Datta, Pallavi Kumari, Suraj Paul
Summary: The use of phase change materials (PCMs) is crucial for energy storage and meeting basic needs. Improving the thermal properties of PCMs through additives and encapsulation can enhance their storage capacity. Encapsulated PCMs and PCM composites have shown superior performance in latent heat thermal energy storage.
JOURNAL OF ENERGY STORAGE
(2022)
Article
Thermodynamics
Nadezhda S. Bondareva, Mikhail A. Sheremet
Summary: This study presents a computational analysis of natural convection melting in a multi-PCM thermal sink and examines the influence of geometric parameters and material arrangements in the system. The results show that vertical flat fins provide lower temperatures and longer melting times despite their smaller surface area when the heat source is located below.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
Article
Green & Sustainable Science & Technology
Vahid Safari, Hossein Abolghasemi, Babak Kamkari
Summary: This study experimentally and numerically investigated the effects of applying straight and bifurcated fin configurations on melting behavior of paraffin inside the shell-and-tube heat exchangers. The research found that the bifurcated fin configuration outperforms the straight fin configuration, and the fin arrangement also significantly impacts the melting process.
Review
Green & Sustainable Science & Technology
M. Eslami, F. Khosravi, H. R. Fallah Kohan
Summary: This paper provides a comprehensive review of various fin designs proposed for latent heat thermal energy storage systems, discussing the effects of different geometrical parameters. The study shows that an optimum number of fins, spacing, and length can be found in each case, while some parameters such as fin thickness are less important.
SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS
(2021)
Article
Green & Sustainable Science & Technology
Gurpreet Singh Sodhi, P. Muthukumar
Summary: This study presents a numerical model of a vertical shell and tube latent heat storage system, validated with experimental data, and analyzes the performance of single PCM and multiple PCM systems. The results show that the multi-PCM system has better charging and discharging performances compared to the single PCM system, with a significant improvement in specific power. By employing a compound enhancement technique, a reduction in charging and discharging time over the single PCM system is achieved.
Article
Energy & Fuels
F. Wu, Y. B. Fan, X. J. Zhang, H. Zhang, Z. L. Wang, Z. W. Wang, L. Jiang
Summary: This study investigates the effect of natural convection on the melting process of a horizontal shell-and-tube latent heat storage unit. The circulation vortex formed by natural convection is found to be the dominant factor affecting the overall heat transfer coefficient. Increasing the endothermic source temperature can advance the melting time of the unit, but the melting tendency of the PCM shows opposite directions due to density inversion and the real properties of ice and water.
JOURNAL OF ENERGY STORAGE
(2022)
Article
Thermodynamics
Devendra Raut, Saurabh Lanjewar, Vilas R. Kalamkar
Summary: This study investigates the effect of geometric and operating parameters on the charging of phase change material (PCM) in a vertical helical coiled latent heat storage (LHS) system. The results show that increasing the coil spacing and HTF inlet temperature can improve the charging process, while varying the HTF flow rate has no significant impact on the charging rate of the PCM.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2022)
Article
Thermodynamics
Shaoliang Zhang, Shuli Liu, Yongliang Shen, Binxu Gao, Mahroo Eftekhari
Summary: The study investigates the heat transfer characteristics of an indirect hybrid thermal energy storage system with adjustable inclination angle of phase change material (PCM) tubes. Experimental results show that changing the PCM tubes inclination angle has significant impacts on the melting time of PCM, the heat transfer coefficient of the heat exchanger, and the average thermal storage rate of the tank. Optimizing the PCM tubes inclination angle is an effective way to improve the thermal storage rate of the system.
APPLIED THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Piyush Rawat, Ahmad Faizan Ashwni, Ahmad Faizan Sherwani
Summary: This article presents a numerical analysis on enhancing the melting process of phase change material (PCM) in a rectangular enclosure using flanged fins (T-shaped). The study examines various cases based on fin length ratio (Lu/Ld) and material with no-fin PCM enclosure. Copper (Cu) fins with a low Lu/Ld ratio of 0.25 result in the highest PCM melting rate and reduced total melting time (tm) compared to the no-fin PCM enclosure. The optimization concludes that a single flanged fin placed at the lower end of the container with a flanged to web ratio (Lf/Lu, d) of 0.55 has the minimum tm and cost per mean power (Cpw).
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Thermodynamics
Mahsa Taghavi, Swapnil Sharma, Vemuri Balakotaiah
Summary: This study investigates the natural convection effects in the insulation layers of spherical storage tanks and their impact on the tanks' performance. The permeability and Rayleigh number of the insulation material are considered as key factors. The results show that as the Rayleigh number increases, new convective cells emerge and cause the cold boundary to approach the external hot boundary. In the case of large temperature differences, multiple solutions may coexist.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Jinyang Xu, Fangjun Hong, Chaoyang Zhang
Summary: This study introduces a self-induced jet impingement device for enhancing pool boiling performance in high power electronic cooling. Through visualization and parametric investigations, the effects of this device on pool boiling performance are studied, revealing the promotion of additional liquid supply and vapor exhausting. The flow rate of the liquid jet is found to positively impact boiling performance.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Wenchao Ke, Yuan Liu, Fissha Biruke Teshome, Zhi Zeng
Summary: Underwater wet laser welding (UWLW) is a promising and labor-saving repair technique. A thermal multi-phase flow model was developed to study the heat transfer, fluid dynamics, and phase transitions during UWLW. The results show that UWLW creates a water keyhole, making the welding environment similar to in air laser welding.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Xingrong Lian, Lin Tian, Zengyao Li, Xinpeng Zhao
Summary: This study investigates the heat transfer mechanisms in natural fiber-derived porous structures and finds that thermal radiation has a significant impact on the thermal conductivity in low-density regions, while natural convection rarely occurs. Insulation materials derived from micron-sized natural fibers can achieve minimum thermal conductivity at specific densities. Strategies to lower the thermal conductivity include increasing porosity and incorporating nanoscale pores using nanosize fibers.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Yasir A. Malik, Kilian Koebschall, Stephan Bansmer, Cameron Tropea, Jeanette Hussong, Philippe Villedieu
Summary: Ice crystal icing is a significant hazard in aviation, and accurate modeling of sticking efficiency is essential. In this study, icing wind tunnel experiments were conducted to quantify the volumetric liquid water fraction, sticking efficiency, and maximum thickness of ice layers. Two measurement techniques, calorimetry and capacitive measurements, were used to measure the liquid water content and distribution in the ice layers. The experiments showed that increasing wet bulb temperatures and substrate heat flux significantly increased sticking efficiency and maximum ice layer thickness.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Jinqi Hu, Tongtong Geng, Kun Wang, Yuanhong Fan, Chunhua Min, Hsien Chin Su
Summary: This study experimentally examined the heat dissipation of vibrating fans and demonstrated its inherent mechanism through numerical simulation. The results showed that the flow fields induced by the vibrating blades exhibited pulsating features and formed large-scale and small-scale vortical structures, significantly improving heat dissipation. The study also identified the impacts of different blade structures and developed a trapezoidal-folding blade, which effectively reduced the maximum temperature of the heat source and alleviated high-temperature failure crisis.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Dan-Dan Su, Xiao-Bin Li, Hong-Na Zhang, Feng-Chen Li
Summary: The boiling heat transfer of low-boiling-point working fluid is a common heat dissipation technology in electronic equipment cooling. This study analyzed the interfacial boiling behavior of R134a under different conditions and found that factors such as the initial thickness of the liquid film, solid-liquid interaction force, and initial temperature significantly affect the boiling mode and thermal resistance.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Jinyi Wu, Dongke Sun, Wei Chen, Zhenhua Chai
Summary: A unified lattice Boltzmann-phase field scheme is proposed to simulate dendrite growth of binary alloys in the presence of melt convection. The effects of various factors on the growth are investigated numerically, and the model is validated through comparisons and examinations.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Shaokun Ge, Ya Ni, Fubao Zhou, Wangzhaonan Shen, Jia Li, Fengqi Guo, Bobo Shi
Summary: This study investigated the temperature distribution of main cables in a suspension bridge during fire scenarios and proposed a prediction model for the maximum temperature of cables in different lane fires. The results showed that vehicle fires in the emergency lane posed a greater thermal threat to the cables.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Shuang-Ying Wu, Shi-Yao Zhou, Lan Xiao, Jia Luo
Summary: This paper investigates the two-phase flow and heat transfer characteristics of low-velocity jet impacting on a cylindrical surface. The study reveals that the heat transfer regimes are non-phase transition and nucleate boiling with the increase of heat transfer rate. The effects of jet impact height and outlet velocity on local surface temperatures are pronounced at the non-phase transition stage. The growth rates of heat transfer rate and liquid loss rate increase significantly from the non-phase transition to nucleate boiling stage.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Emad Hasani Malekshah, Wlodzimierz Wlodzimierz, Miros law Majkut
Summary: Cavitation has significant practical importance and can be controlled by air injection. This study investigates the natural to ventilated cavitation process around a hydrofoil through numerical and experimental methods. The results show that the location and rate of air injection have a meaningful impact on the characteristics of cavitation.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Feriel Yahiat, Pascale Bouvier, Antoine Beauvillier, Serge Russeil, Christophe Andre, Daniel Bougeard
Summary: This study explores the enhancement of mixing performance in laminar flow equipment by investigating the generation of chaotic advection using wall deformations in annular geometries. The findings demonstrate that the combined geometry can achieve perfect mixing at various Reynolds numbers.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Hui He, Ning Lyu, Caihua Liang, Feng Wang, Xiaosong Zhang
Summary: This study investigates the condensation, frosting, and defrosting processes on superhydrophobic surfaces with millimeter-scale structures. The results reveal that the structures can influence the growth and removal of frost crystals, with the bottom grooves creating a frost-free zone and conical edges promoting higher frost crystal heights. Two effective methods for defrosting are observed: hand-lifting the groove and airfoil retraction contraction on protruding structures. This research provides valuable insights into frost formation and defrosting on millimeter-structured superhydrophobic surfaces, with potential applications in anti-frost engineering.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Thiwanka Arepolage, Christophe Verdy, Thibaut Sylvestre, Aymeric Leray, Sebastien Euphrasie
Summary: This study developed two thermal concentrators, one with a 2D design of uniform thickness and another with a 3D design, using the coordinate transformation technique and metamaterials. By structuring the thermal conductor, the desired local density-heat capacity product and anisotropic thermal conductivities were achieved. The homogenized thermal conductivities were obtained from finite element simulations and cylindrical symmetry consideration. A 3D concentrator was fabricated using 3D metal printing and characterized using a thermal camera. Compared to devices that solely consider anisotropic conductivities, the time evolution characteristics of the metadevice designed with coordinate transformation were closer to those of an ideal concentrator.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Liangyuan Cheng, Qingyang Wang, Jinliang Xu
Summary: In this study, we investigated the supercritical heat transfer of CO2 in a horizontal tube with a diameter of 10.0 mm, covering a wide range of pressures, mass fluxes, and heat fluxes. The study revealed a non-monotonic increase in wall temperatures along the flow direction and observed both positive and negative wall temperature differences between the bottom and top tube. The findings were explained by the thermal conduction in the solid wall interacting with the stratified-wavy flow in the tube.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)