Article
Green & Sustainable Science & Technology
Ali Tavakoli, Mahmood Farzaneh-Gord, Amir Ebrahimi-Moghadam
Summary: This study evaluates the thermo-hydraulic performance of utilizing sinusoidal internal fins and phase change material (PCM) in LHTES systems. A numerical framework is developed to analyze the geometrical parameters of the fins and investigate different heat transfer and thermodynamic characteristics. The results show that the highest growth of liquid fraction and the lowest entropy generation are achieved in case 4, with H/L = 0.125 and a thickness of 3mm, compared to a case with simple straight fins.
Article
Thermodynamics
Ma Qingchan, Yang Yanxia, Zuo Yuqing
Summary: The heat transfer performance of heat exchanger with mixed cross-corrugated plate is influenced by factors such as phase shift angle and Reynolds number. The heat transfer performance of the lower wall is always superior to that of the upper wall, with the optimal heat transfer performance achieved at a phase shift angle of 324°.
APPLIED THERMAL ENGINEERING
(2021)
Article
Thermodynamics
Yurong Yang, Shixue Wang, Yu Zhu, Guoyin Zhang
Summary: Adding a phase change chamber to an automotive exhaust thermoelectric generator can increase the power output and conversion efficiency. This research experimentally investigated the heat transfer characteristics of chambers with different condensation to boiling area ratios and found that the heat flux and area ratio have significant effects on the heat transfer characteristics.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Thermodynamics
Min Li, Dandan Yan, Junbing Shi
Summary: A multi-scale heat transfer model of a wall containing phase-change thermal insulation mortar (PCTIM) was established to study the effect of phase-change material on the heat transfer characteristics. The results showed that PCTIM can improve indoor thermal comfort and reduce building energy consumption. Increasing the latent heat and content of phase-change material effectively improved the temperature control effect and energy-saving effect. However, increasing the thermal conductivity of the phase-change material decreased the energy-saving effect in summer.
Article
Thermodynamics
Sinan Caliskan, Seyfi Sevik, Ozgur Ozdilli
Summary: The impact of punched triangular longitudinal vortex generators and sinusoidal wavy plates on convective heat transfer was investigated using various approaches. Experimental results showed that the vortex generators, sinusoidal structure, and punched hole significantly improved the thermal performance. The Taguchi technique was utilized to reduce the number of trials and determine the optimal conditions for heat transfer.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2022)
Article
Thermodynamics
Mohammad Abbaszadeh, Mohammad Hossein Montazeri, Mojtaba Mirzaie
Summary: This study proposes a novel implementation of twisted tape in sinusoidal wavy-walled tubes to enhance heat transfer rate without compromising thermal efficiency. The study numerically investigates the effect of different geometrical configurations on heat transfer improvement and performance factor. The results suggest that implementing twisted tape in wavy tubes significantly increases heat transfer rate and performance factor.
INTERNATIONAL JOURNAL OF NUMERICAL METHODS FOR HEAT & FLUID FLOW
(2023)
Review
Energy & Fuels
Weiyi Liu, Yu Bie, Tao Xu, Andrzej Cichon, Grzegorz Krolczyk, Zhixiong Li
Summary: This paper summarizes the PCMs used in solar thermal utilization and their thermal physical parameters at different operating temperature ranges. It also introduces the thermal performance evaluation index of LHETS and reviews several methods for improving its performance. Additionally, the paper proposes some deeper problems and recommendations for future research.
JOURNAL OF ENERGY STORAGE
(2022)
Article
Thermodynamics
Salman Al Zahrani, Mohammad S. Islam, Suvash C. Saha
Summary: This study aims to enhance the thermal performance of the basic plate heat exchanger (FPHE) by proposing a new flow arrangement. Computational fluid dynamics simulations show that the modified FPHE has significantly higher Nusselt number and friction factor compared to the basic FPHE.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2021)
Article
Energy & Fuels
Amin Shahsavar, Abbas Goodarzi, Pouyan Talebizadehsardari, Mulsum Arici
Summary: This study investigated the phase change process in a double-pipe latent heat storage system with sinusoidal wavy fins, which resulted in significant efficiency improvements. The best wave profile was determined to have a wave-amplitude of 2 mm and a wavelength of 1 mm. Additionally, the characteristics of the water flow in the system were found to impact performance.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2021)
Article
Thermodynamics
Mohammad Sharif Zarei, Amir Taghavi Khalil Abad, Maboud Hekmatifar, Davood Toghraie
Summary: The main purpose of this study is to investigate the wavy wall effect caused by a sinusoidal function in a two-dimensional natural convection cavity with Cu-Water nanofluid. Through numerical simulation and statistical analysis, it was found that the volume fraction of nanoparticles plays the most important role in heat transfer, with a significant improvement in heat transfer efficiency as the volume fraction increases, while the wall wavelength has a minor effect on heat transfer.
CASE STUDIES IN THERMAL ENGINEERING
(2022)
Article
Engineering, Multidisciplinary
Sohail Nadeem, Salman Akhtar, Fahad M. Alharbi, Salman Saleem, Alibek Issakhov
Summary: This research article introduces a novel mathematical model that interprets the peristaltic flow in elliptic duct with heat and mass transfer for the first time. A unique mathematical technique is used to provide exact analytical solutions for partial differential equations. The graphical results reveal axially symmetric flow behavior and show that concentration, velocity and temperature profiles exhibit parabolic shapes with axially symmetric behavior.
ALEXANDRIA ENGINEERING JOURNAL
(2022)
Article
Chemistry, Physical
Huan Liu, Zhaoteng Han, Qianwei Wang, Xiang Wang, Dezhen Wu, Xiaodong Wang
Summary: The phase-change microcapsule system based on an n-docosane core and SiO2/nanostructural Ni(OH)2 layer-by-layer shell showed a high latent heat-storage capacity and energy-storage efficiency. By combining traditional phase-change microcapsules with a nanostructural Ni(OH)2 outer layer, the system achieved enhanced heat transfer properties and fast thermal response ability for various applications.
APPLIED SURFACE SCIENCE
(2021)
Article
Engineering, Chemical
Jinxin Feng, Yuyao Guo, Ziye Ling, Xiaoming Fang, Zhengguo Zhang
Summary: This study demonstrates a strategy to enhance the thermal-response rate of latent-heat thermal energy storage (LHTES) by improving heat transfer through PCM-nanoemulsions. The results show that nanoemulsions can accelerate the discharge rate of LHTES and reduce discharge time.
CHEMICAL ENGINEERING SCIENCE
(2023)
Article
Nanoscience & Nanotechnology
Youngsup Song, Shuai Gong, Geoffrey Vaartstra, Evelyn N. Wang
Summary: Boiling is a fundamental process in many applications where surfaces with microcavities or biphilic wettability can enhance heat transfer efficiency. This study investigated microtube structures to simultaneously enhance heat transfer coefficient and critical heat flux, achieving significant improvements compared to smooth surfaces. The combination of micropillars and microtubes further increased critical heat flux by separating nucleating bubbles and rewetting liquids.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Review
Energy & Fuels
Xueliang Zhu, Yan Li, Qunzhi Zhu
Summary: In the process of industrial waste heat recovery, phase change heat storage technology is popular due to its high heat storage density and constant temperature absorption/release process. This paper summarizes the development of new fins in the industry and the optimization results of size, shape, and arrangement. The research shows that multi-branch structure, non-uniform fin array, and targeted fin arrangement can enhance heat transfer.
JOURNAL OF ENERGY STORAGE
(2022)
Article
Nuclear Science & Technology
Koung Moon Kim, Ji-Hwan Hwang, Somchai Wongwises, Dong-Wook Jerng, Ho Seon Ahn
NUCLEAR ENGINEERING AND TECHNOLOGY
(2020)
Article
Thermodynamics
Kanit Aroonrat, Lazarus Godson Asirvatham, Ahmet Selim Dalkilic, Omid Mahian, Ho Seon Ahn, Somchai Wongwises
Summary: The investigation found that the evaporative heat transfer coefficient of R-134a in dimpled tubes is significantly influenced by the dimpled depth, but less affected by the helical pitch and dimpled pitch. Experimental results provided a range for the heat transfer enhancement factor and pressure drop penalty factor, along with proposed correlations for predicting Nusselt number and friction factor during evaporation in dimpled tubes.
HEAT AND MASS TRANSFER
(2021)
Article
Thermodynamics
Dong Ho Nguyen, Koung Moon Kim, Thi To Nguyen Vo, Gyu Hyeon Shim, Ji Hoon Kim, Ho Seon Ahn
Summary: In this study, electroless plating of nickel, copper, and silver was used on stainless steel 316 plate heat exchangers to enhance their thermal-hydraulic efficiency. Optimized process parameters were determined for improving surface properties and reducing mass loss, leading to a significant increase in performance as indicated by various evaluation criteria.
CASE STUDIES IN THERMAL ENGINEERING
(2021)
Article
Thermodynamics
Su Cheong Park, Moo Hwan Kim, Dong In Yu, Ho Seon Ahn
Summary: The study investigated the effects of wall temperature, micro-pillar array size, and micro-pillar height on the outcomes of a single water drop impinging onto a heated surface with micro-pillar arrays. Micro-pillar arrays can lead to explosive lift-off behavior and increase the Leidenfrost temperature.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Thermodynamics
Hawatchai Keawkamrop, Lazarus Godson Asirvatham, Ahmet Selim Dalkilic, Ho Seon Ahn, Omid Mahian, Somchai Wongwi
Summary: This study experimentally investigates the performance of crimped spiral fin-and-tube heat exchangers with a small tube diameter. The results show that the fin pitch and outer diameter have significant effects on the heat transfer characteristics and friction factor. Correlations between the Nu, j, and f are proposed for designing heat exchangers in the thermal industry.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Review
Thermodynamics
Dong Ho Nguyen, Ho Seon Ahn
Summary: This paper discusses the methods of improving heat exchanger thermal-hydraulic efficiency through micro/nanoscale surface modification techniques. The results show that modified surfaces have great potential in enhancing heat transfer efficiency in heat exchangers by inducing turbulence and fluid mixing.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Thermodynamics
Kitti Nilpueng, Mehrdad Mesgarpour, Lazarus Godson Asirvatham, Ho Seon Ahn, Omid Mahian, Somchai Wongwises, Ahmet Selim Dalkilic
Summary: The study investigated the effects of different shapes, orientations, and distances on the air flow and heat transfer characteristics inside plate pin fin heat sinks. Results showed that under the same area, square pin fin heat sinks had higher heat transfer coefficient and pressure drop compared to circular pin fin heat sinks, while decreasing the distance led to an increase in heat transfer coefficient and pressure drop.
CASE STUDIES IN THERMAL ENGINEERING
(2021)
Article
Thermodynamics
Chang Hun Lee, Somchai Wongwises, Dong-Wook Jerng, Ho Seon Ahn
Summary: The breakup mechanism of microbubbles in a 2D channel was studied through visualization experiments using a venturi-shaped nozzle. Increasing the rear-end exit angle of the nozzle led to smaller bubble sizes but also the formation of wake flow above 20 degrees. Analysis revealed that air bubbles interacted with the central flow and split into pieces. The use of a flare-shaped diffuser improved bubble breakup performance compared to a linear exit angle, specially in conditions with a water flow rate of 35 L/min and an air flow rate of 0.1 L/MIN.
CASE STUDIES IN THERMAL ENGINEERING
(2021)
Article
Thermodynamics
Parinya Kiatpachai, Thawatchai Kaewkamrop, Mehrdad Mesgarpour, Ho Seon Ahn, Ahmet Selim Dalkilic, Omid Mahian, Somchai Wongwises
Summary: This paper presents the air-side performance of embedded and welded spiral fin and tube heat exchangers. The experiment results show that the fin pitch has no effect on the air-side performance of embedded spiral fin and tube heat exchangers, but it does influence the air-side performance of the welded ones. The embedded spiral fin and tube heat exchanger has a higher heat transfer rate due to better fin base connections, while the pressure drop of the welded spiral fin and tube heat exchanger is greater.
CASE STUDIES IN THERMAL ENGINEERING
(2022)
Article
Thermodynamics
Kittipong Sakamatapan, Mehrdad Mesgarpour, Omid Mahian, Ho Seon Ahn, Somchai Wongwises
Summary: The experimental results showed that as the water flow rate increased, the airflow rate also increased, resulting in smaller but more numerous microbubbles.
CASE STUDIES IN THERMAL ENGINEERING
(2021)
Article
Thermodynamics
Mehrdad Mesgarpour, Kittipong Sakamatapan, Ahmet Selim Dalkilic, Rasool Alizadeh, Ho Seon Ahn, Somchai Wongwises
Summary: This study investigates the flow pattern and thermal behavior of constructal theory-based pore-scale porous media (CTPSPM) using computational fluid dynamics (CFD) and machine learning. A novel hybrid computational method is developed to predict the flow pattern and thermal behavior based on high-fidelity numerical simulation. The results show that a multiblock neural network can significantly reduce computational costs and that the constructal theory has a significant impact on heat transfer.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Thermodynamics
Dong Ho Nguyen, Boyeon Kweon, Jae -Sung Kwon, Taewan Kim, Somchai Wongwises, Ho Seon Ahn
Summary: This article introduces an innovative plate heat exchanger design that utilizes symmetric airfoil profile corrugation, resulting in reduced pressure drop and improved heat transfer performance. A parametric study is conducted to determine the optimal geometric configuration.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Chemistry, Multidisciplinary
Thi To Nguyen Vo, Dong-In Yu, Ho Seon Ahn
Summary: A practical approach to designing 3D porous materials with new functionalities for oil spill clean-up attracts widespread attention. The carbonized seaweed-coated melamine sponge (CMS) can selectively absorb oil immediately due to its countless pores using capillary-driven force to absorb oil. The microstructure and behaviors of the CMS are thoroughly investigated in relation to the unique porous structure, mechanical stability, wetting response, and in-depth processing of the high-speed visualization experiment to determine its promising abilities. The theoretical models proposed based on quantitative analysis of optically analyzed oil interface phenomena are shown to be a reliable approach for describing volumetric absorption rate and effective CMS thickness. It is expected that this research will hold tremendous potential strategies for environmental remediation.
ADVANCED MATERIALS INTERFACES
(2023)
Article
Chemistry, Multidisciplinary
Thi To Nguyen Vo, Sun Taek Lim, Ji Hoon Kim, Gyu Hyeon Shim, Koung Moon Kim, Boyeon Kweon, Miyeon Kim, Chang Yeon Lee, Ho Seon Ahn
Summary: This study demonstrates the synthesis of graphene materials with interconnected pore networks and shows their high efficiency in removing volatile organic compounds. The unique structure of the graphene materials has a significant impact on the removal performance.
Article
Chemistry, Multidisciplinary
Ji Hoon Kim, Gyu Hyeon Shim, Thi To Nguyen Vo, Boyeon Kweon, Koung Moon Kim, Ho Seon Ahn
Summary: This study analyzed the structure and chemistry of GO products by considering parent graphite sources and different oxidation methods. The oxidation level of GO was characterized by monitoring the C/O and sp(2) carbon ratio from XPS spectra.
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)
