Article
Thermodynamics
Rajendran Prabakaran, Mohammad Salman, Poongavanam Ganesh Kumar, Dongchan Lee, Sung Chul Kim
Summary: This study investigated the evaporation heat transfer coefficient and two-phase frictional pressure drop of R1234yf in a brazed plate heat exchanger with offset strip fins. The results showed that the evaporation heat transfer coefficient was significantly influenced by the mass flux and vapor quality, while the two-phase frictional pressure drop increased with the mass flux, vapor quality, and heat flux, but decreased with the saturation temperature. New correlations were proposed for forecasting the Nusselt number and friction factor of R1234yf with reasonable accuracy.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Energy & Fuels
Dan Zheng, Jiawang Yang, Jin Wang, Stephan Kabelac, Bengt Sunden
Summary: This paper experimentally investigated the effect of various magnetic fields on the performance of a plate heat exchanger filled with ferrofluids. It was found that with the proper arrangement of magnets, both thermal performance and pressure drop of the heat exchanger can be improved.
Article
Thermodynamics
Olga Arsenyeva, Olexandr Perevertaylenko, Leonid Tovazhnyanskyy, Pavlo Arsenyev, Petro Kapustenko
Summary: The requirements for sustainable development in modern society due to climate change call for more actions towards environmental protection, particularly in industrial processes through increased heat recovery. The development of new efficient heat transfer equipment with enhanced heat transfer characteristics for different processes is essential. This study proposes a novel design of a plate type heat exchanger called the panel plate heat exchanger and presents empirical correlations for friction factor and heat transfer coefficients based on experimental investigations. Compared to pillow-plate heat exchangers, the panel plate heat exchanger achieves up to a 28% improvement in heat transfer with a 48% increase in friction factor. The calculated design for water heating shows that the investigated panel heat exchanger with multi-pass channels arrangement has a heat transfer area close to that of a pillow-plate heat exchanger, but with potential for further reduction through optimization of its geometrical characteristics.
THERMAL SCIENCE AND ENGINEERING PROGRESS
(2023)
Article
Thermodynamics
Olga Arsenyeva, Jiri Jaromir Klemes, Eugeny Klochock, Petro Kapustenko
Summary: This study presents the results of mathematical modelling and experimental study on plate heat exchangers (PHEs) in steam-air mixture condensation. The research shows that the heat transfer area and pressure drop of PHE can vary under different conditions. The optimal corrugation angle and height for plates designed for specific tasks can be selected by solving a future optimization problem with the developed mathematical model.
Article
Thermodynamics
Rajendran Prabakaran, Mohammad Salman, Poongavanam Ganesh Kumar, Dongchan Lee, Sung Chul Kim
Summary: This study investigated the evaporation characteristics of the R290 + CF3i mixture in a plate heat exchanger and found that nucleate boiling is quenched at lower vapor quality. The two-phase frictional pressure drop increases with mean vapor quality. The heat transfer coefficient is largely augmented with increases in mass flux.
APPLIED THERMAL ENGINEERING
(2022)
Article
Thermodynamics
Mohammad Salman, Rajendran Prabakaran, Dongchan Lee, Sung Chul Kim
Summary: This study experimentally investigated the saturated flow boiling characteristics of R290/R1270 mixture and pure R290 in a plate heat exchanger with offset strip fins. The results showed that convection dominated the boiling process at higher vapor qualities, while nucleate boiling dominated at lower vapor qualities. The heat-transfer coefficient and frictional pressure drop of R290/R1270 were strongly influenced by the mass flux range. Correlations for R290/R1270 in the form of Nusselt number and the two-phase friction factor have been established with high reliability.
APPLIED THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Olga Arsenyeva, Jiri Jaromir Klemes, Leonid Tovazhnyanskyy, Eugeny Klochok, Petro Kapustenko
Summary: The condensation of vapours in the presence of non-condensable gas is a common phenomenon in many industries. The efficient use of heat exchanger networks can increase energy usage efficiency. Plate heat exchangers with enhanced heat and mass transfer are effective in these processes. This study proposes a method for the preliminary selection of plate heat exchangers for steam condensation. The method uses a mathematical model and is implemented as a computer program for HEN optimization.
Article
Thermodynamics
Wannarat Rakpakdee, Suphakorn Tuntarungsri, Mongkol Pornnattawut, Masaaki Motozawa, Mitsuhiro Fukuta, Weerachai Chaiworapuek
Summary: By altering the configuration of the inlet flow channel, the heat transfer and pressure drop of water flow in double vertical coils and a shell heat exchanger were investigated under 28 kHz ultrasound. The position of activated ultrasonic transducers at P1-P9 was examined for its effects. The results showed that modifying the inlet flow configuration from two to four channels enhanced the Nusselt number by 11.6% on the shell side and increased the heat transfer capability by approximately 9% with ultrasonic irradiation.
APPLIED THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Saeed Vahidifar, Seyedhadi Banihashemi
Summary: Researchers have conducted numerous studies on active and passive methods to improve thermal performance and increase heat transfer in internal flows. Different geometries and configurations of turbulators have been proposed for optimal performance in heat exchangers. However, there is limited research on turbulators with equal obstruction inside the tube and aerodynamic geometry. This study investigates the effect of stimulating the boundary layer of the internal flow on heat transfer and flow characteristics, using a pipe with ring-shaped turbulators and equal blocking area.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2023)
Article
Thermodynamics
Yun Mo Ko, Jae Hoon Jung, Sangho Sohn, Chan Ho Song, Yong Tae Kang
Summary: The study analyzed the effects of mass flux, heat flux, and condensation pressure on the condensation heat transfer coefficient and frictional pressure drop of R124 in plate heat exchangers with different chevron angles. Correlations for Nusselt number and friction factor were developed based on experimental data, and correction factors were introduced for validation.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Review
Energy & Fuels
Olga Arsenyeva, Leonid Tovazhnyanskyy, Petro Kapustenko, Jiri Jaromir Klemes, Petar Sabev Varbanov
Summary: A plate heat exchanger (PHE) is a modern and efficient heat transfer equipment, capable of enhancing heat recuperation and energy efficiency. This paper reviews the construction and exploration developments of PHEs, as well as the methods of heat transfer intensification. The use of inclined corrugations on the surface of PHE plates is a common method to improve performance.
Article
Thermodynamics
Kitti Nilpueng, Tanachon Chomamuang, Mehrdad Mesgarpour, Omid Mahian, Somchai Wongwises
Summary: This study proposes a plate heat exchanger partially filled with metal foam and investigates the effects of mass flux, foam groove width, and pore density on heat transfer coefficient and pressure drop. The results show that reducing groove width and increasing pore density lead to higher heat transfer coefficient and pressure drop.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Physics, Multidisciplinary
Anas F. A. Elbarghthi, Mohammad Yousef Hdaib, Vaclav Dvorak
Summary: Plate heat exchangers (PHE) are widely used in various applications, and utilizing new and unique heat sources is crucial for improving heat transfer efficiency. This study investigates the effect of different parameters, such as heat transfer coefficients, pressure drop, and effectiveness, on the performance of PHE through experimental and analytical methods.
Review
Thermodynamics
Amirhossein Sabourishirazi, Maryam Ghodrat, Jong-Leng Liow, Masud Behnia
Summary: This paper reviews the recent progress in design and optimization of pillow-plate heat exchangers (PPHEs), highlighting their potential for widespread application across diverse industries. These heat exchangers offer exceptional heat transfer capabilities and minimal pressure drops, making them a promising eco-friendly alternative to traditional heat exchangers. However, the complex geometries of PPHEs present challenges for comprehensive research.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2023)
Article
Construction & Building Technology
C. P. Liang, F. Ture, Y. J. Dai, R. Z. Wang, T. S. Ge
Summary: This paper studied a series of condensation experiments on a desiccant coated microchannel heat exchanger under high temperature and high humidity conditions, discussing the dynamic characteristics and parametric effects, finding stable performance of DCMHE under continuous condensation conditions, and proposing an optimal range for inlet air velocity.
ENERGY AND BUILDINGS
(2021)
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)