Article
Thermodynamics
Abdolvahab Ravanji, Mehran Rajabi Zargarabadi
Summary: The study demonstrates that elliptical pin-fins are the most effective in cooling a heated flat plate, significantly decreasing local temperatures and increasing heat transfer efficiency.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2021)
Article
Thermodynamics
Cong Hiep Hoang, Najmeh Fallahtafti, Srikanth Rangarajan, Ahmad Gharaibeh, Yaser Hadad, Charles Arvin, Kamal Sikka, Scott N. Schiffres, Bahgat Sammakia
Summary: The study examined the effects of fin geometry on two-phase heat transfer and pressure drop in a two-phase cooling impingement heat sink. Results showed that converting a microchannel heat sink into a pin fin array heat sink improved thermal performance by 51% and decreased pressure drop by 18%. The new correlation developed for pool boiling and flow boiling showed a mean absolute error of 2.4%.
APPLIED THERMAL ENGINEERING
(2021)
Article
Thermodynamics
Ramaswamy Devakottai Sundaram, Srivatsan Madhavan, Prashant Singh, Srinath Ekkad
Summary: Combining array jet impingement with concentric micro pin-fins leads to enhanced heat dissipation without significant increase in pumping power. Additive manufacturing allows for the production of roughness elements with high accuracy, improving the manufacturability of such configurations. Experimental and numerical studies were conducted to characterize the heat transfer performance and validate the computational model, demonstrating the effectiveness of concentric micro pin-fins in heat transfer applications.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Thermodynamics
Orhan Yalcinkaya, Ufuk Durmaz, Ahmet Umit Tepe, Unal Uysal, Mehmet Berkant Ozel
Summary: This study investigated the effects of heat transfer performance on a roughened target surface with slot-shaped pins using numerical models. The results showed that pin heights, pin arrangements, and Reynolds numbers significantly affected convective heat transfer. By optimizing the geometric parameters, the negative effects of thermal stresses on the target surface could be reduced, extending the material's lifespan. This research is significant for the design and optimization of internal cooling channels in gas turbine blades.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2022)
Article
Engineering, Multidisciplinary
M. Abadi, A. A. Ranjbar, M. Gorzin, R. Bahrampoury, M. J. Hosseini
Summary: In this study, the influence of rotational angle of splitters attached to pin fins on the heat transfer performance was investigated for two cases of identical and opposite directions. The results showed that for the identical-direction case, as the angle increased, the heat transfer performance and turbulent kinetic energy increased, and the friction factor and pressure drop also increased. For the opposite-direction case, the heat transfer performance decreased from 0 to 45 degrees, but increased from 45 to 90 degrees, and the friction factor and pressure drop also increased.
ALEXANDRIA ENGINEERING JOURNAL
(2023)
Article
Engineering, Multidisciplinary
M. Abadi, A. A. Ranjbar, M. Gorzin, R. Bahrampoury, M. J. Hosseini
Summary: The influence of the rotational angle of splitters attached to pin fins on heat transfer improvement was investigated in this study. The results showed that, for the identical-direction case, as the angle increased, the average Nusselt number, turbulent kinetic energy, friction factor, and pressure drop increased. For the opposite-direction case, the friction factor and pressure drop also increased, and the Nusselt number decreased from 0 to 45 degrees but increased from 45 to 90 degrees.
ALEXANDRIA ENGINEERING JOURNAL
(2023)
Article
Thermodynamics
Xinyu Ji, Xiang Ma, Xiaoping Yang, Jinjia Wei, Bengt Sunden
Summary: Through experimental study, it was found that nucleate boiling can be suppressed and forced convection heat transfer can be enhanced by increasing the jet velocity. On the micro-pin-finned surface, the heat transfer is greatly intensified due to the increase in surface area and the number of nucleation sites.
APPLIED THERMAL ENGINEERING
(2023)
Article
Thermodynamics
L. Ludick, K. J. Craig, P. Valluri, J. P. Meyer
Summary: Jet impingement combined with boiling has been proven to enhance heat transfer. In this study, the numerically investigation of a confined single jet impinging on a copper surface with pin-fin surface enhancement under boiling conditions was conducted. It was found that local dry-out can be decreased through decreasing flow obstruction and heat transfer is mainly linked to surface augmentation. The star pattern distribution allowed for a substantial increase in the critical heat flux compared to the in-line arrangement, while the pressure drop over the domain was dominated by the stagnation pressure.
APPLIED THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Joo Hyun Moon, Soyeong Lee, Jungho Lee, Seong Hyuk Lee
Summary: This study numerically investigates the rapid cooling heat transfer characteristics of superheated solid surfaces when subjected to subcooled water jet impingement. The results show the formation of a vapor blanket near the impingement point, preventing direct contact between the liquid and heated surface.
CASE STUDIES IN THERMAL ENGINEERING
(2022)
Article
Thermodynamics
Shyy Woei Chang, Ji Lin Lee
Summary: This study investigates the cooling performance of a gas turbine rotor blade using a rotating wedge-shaped impingement and pin-fin channel. The addition of grooves on the nozzle walls improves the coolant flow and enhances the cooling effect.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Thermodynamics
Vahideh Radmard, Yaser Hadad, Srikanth Rangarajan, Cong H. Hoang, Najmeh Fallahtafti, Charles L. Arvin, Kamal Sikka, Scott N. Schiffres, Bahgat G. Sammakia
Summary: The study investigates a new packaging technique by directly attaching micro pin fins onto a chip surface to eliminate certain thermal resistances, resulting in an optimized cooling device demonstrating excellent thermal and hydraulic performance.
APPLIED THERMAL ENGINEERING
(2021)
Article
Thermodynamics
Orhan Yalcinkaya, Ufuk Durmaz, Ahmet Umit Tepe, Unal Uysal, Mehmet Berkant Ozel
Summary: The aim of this study is to achieve a more uniform heat transfer distribution and enhance heat transfer on the surface by mounting elliptical pins on the impingement regions in a jet impingement cooling system. The results showed that the use of elliptical pins significantly increased the local and average Nusselt numbers, and provided a more uniform heat transfer distribution compared to the conventional jet impingement cooling system.
APPLIED THERMAL ENGINEERING
(2023)
Article
Engineering, Manufacturing
Taehyun Kim, Eui Yeop Jung, Seungyeong Choi, Hee Seung Park, Changyong Lee, Hyung Hee Cho
Summary: Impingement cooling is an effective method for removing heat from a high temperature target surface through sprayed jets. The heat/mass transfer coefficients on the target surface are significantly affected by the crossflow rate and pin-fin structures, with smaller jet hole spacing leading to increased heat/mass transfer efficiency.
IEEE TRANSACTIONS ON COMPONENTS PACKAGING AND MANUFACTURING TECHNOLOGY
(2021)
Article
Thermodynamics
Jun-Suk Youn, Won-Woo Choi, Sung-Min Kim
Summary: The study primarily investigated the heat transfer characteristics of jet array impingement with effusion holes and aimed to provide basic data for the design of a gas-turbine casing cooling system. The three-dimensional numerical unit cell model was constructed and validated for a wide range of geometric parameters using previous experimental data. An assessment was made on the accuracy of previous Nusselt number correlations for a jet array impingement, and a new correlation was proposed for predicting the average Nusselt number for a jet array impingement with effusion holes.
APPLIED THERMAL ENGINEERING
(2021)
Article
Thermodynamics
Xiaoru Zhuang, Yichen Xie, Xiang Li, Sijun Yue, Haitao Wang, Handong Wang, Peng Yu
Summary: An experimental investigation was conducted to study the flow boiling heat transfer and pressure drop characteristics in a microchannel with in-line circular pin fins. The effects of mass flux, inlet subcooling temperature, heat flux, and vapor quality were examined and analyzed. The experimental data were compared with published data and improved correlations were proposed.
APPLIED THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Hai Zhao, Puzhen Gao, Xiaochang Li, Ruifeng Tian, Hongyang Wei, Sichao Tan
Summary: This study numerically investigates the interaction between flow-induced vibration and forced convection heat transfer in a tube bundle. The results show that the impact of flow-induced vibration on heat transfer varies in different flow velocity regions.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Rohit Chintala, Jon Winkler, Sugirdhalakshmi Ramaraj, Xin Jin
Summary: The current state of fault detection and diagnosis for residential air-conditioning systems is expensive and not suitable for widespread implementation. This paper proposes a cost-effective solution by introducing an automated fault detection algorithm as a screening step before more expensive tests can be conducted. The algorithm uses home thermostats and local weather information to identify thermodynamic parameters and detect high-impact air-conditioning faults.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
A. Azimi, N. Basiri, M. Eslami
Summary: This paper presents a novel optimization algorithm for improving the water-film cooling system of photovoltaic panels, resulting in a significant increase in net energy generation.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Duc-Thuan Phung, Chin-Hsiang Cheng
Summary: In this study, a novel CFDMD model is used to analyze and investigate the behavior of thermal-lag engines (TLE). The study shows that the CFDMD model effectively captures the thermodynamic behavior of the working gas and the dynamic behavior of the engine mechanism. Additionally, the study explores the temporal evolution of engine speed and the influence of various parameters on shaft power and brake thermal efficiency. The research also reveals the existence of a thermal-lag phenomenon in TLE.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Haiying Yang, Yinjie Shen, Lin Li, Yichen Pan, Ping Yang
Summary: The purpose of this article is to find a measure to improve the interfacial thermal transfer of graphene/silicon heterojunction. Through molecular dynamics simulation, it is found that surface modification can significantly reduce the thermal resistance, thereby improving the thermal conductivity of the graphene/silicon interface.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Qiong Wu, Yancheng Wang, Haonan Zhou, Xingye Qiu, Deqing Mei
Summary: This article introduces a visible methanol steam reforming microreactor, which uses an optical crystal as an observation window and measures the reaction temperature in real-time using infrared thermography. The results show that under lower oxygen to carbon ratio conditions, the microreactor has a higher heating rate and a stable gradient in temperature distribution.
APPLIED THERMAL ENGINEERING
(2024)
Review
Thermodynamics
Giulia Manco, Umberto Tesio, Elisa Guelpa, Vittorio Verda
Summary: In the past decade, there has been a growing interest in studying energy systems for the combined management of power vectors. Most of the published works focus on finding the optimal design and operations of Multi Energy Systems (MES). However, for newcomers to this field, understanding how to achieve the desired optimization details while controlling computational expenses can be challenging and time-consuming. This paper presents a novel approach to analyzing the existing literature on MES, with the aim of guiding practical development of MES optimization. Through the discussion of six case studies, the authors provide a mathematical formulation as a reference for building the model and emphasize the impact of different aspects on the problem nature and solver selection. In addition, the paper also discusses the different approaches used in the literature for incorporating thermal networks and storage in the optimization of multi-energy systems.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Xuepeng Yuan, Caiman Yan, Yunxian Huang, Yong Tang, Shiwei Zhang, Gong Chen
Summary: In this study, a multi-scale microgroove wick (MSMGW) was developed by laser irradiation, which demonstrated superior capillary performance. The surface morphology and performance of the wick were affected by laser scan pitch, laser power, repetition frequency, and scanning speed. The MSMGW showed optimal capillary performance in alumina material and DI water as the working fluid.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Maofei Mei, Feng Hu, Chong Han
Summary: This paper proposes an effective local search method based on detection of droplet boundaries for understanding the dynamic process of droplet growth during dropwise condensation. The method is validated by comparing with experimental data. The present simulation provides an effective approach to more accurately predict the nucleation site density in future studies.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Rahul Kumar Sharma, Ashish Kumar, Dibakar Rakshit
Summary: The study explores the use of phase change materials (PCM) as a retrofit with Heating Ventilation and Air-conditioning systems (HVAC) to reduce energy consumption and improve air quality. By incorporating PCM with specific thickness and fin configurations, significant energy savings can be achieved in comparison to standard HVAC systems utilizing R134a. This research provides policymakers with energy-efficient and sustainable solutions for HVAC systems to combat climate change.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Zhenhua Ren, Xiangjin Meng, Xingang Qi, Hui Jin, Yunan Chen, Bin Chen, Liejin Guo
Summary: This paper investigates the heat transfer mechanism and factors influencing thermal radiation in the process of supercritical water gasification (SCWG) of coal, and proposes a comprehensive numerical model to simulate the process. Experimental validation results show that thermal radiation accounts for a significant proportion of the total heat exchange in the reactor and a large amount of radiant energy exists in the important spectral range of supercritical water. Enhancing radiative heat transfer can effectively increase the temperature of the reaction medium and the gasification rate.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Mauro Abela, Mauro Mameli, Sauro Filippeschi, Brent S. Taft
Summary: Pulsating Heat Pipes (PHP) are passive two-phase heat transfer devices with a simple structure and high heat transfer capabilities. The actual unpredictability of their dynamic behavior during startup and thermal crisis hinders their large-scale application. An experimental apparatus is designed to investigate these phenomena systematically. The results show that increasing the number of evaporator sections and condenser temperature improves the performance of PHP. The condenser temperature also affects the initial liquid phase distribution and startup time.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Ke Gan, Ruilian Li, Yi Zheng, Hui Xu, Ying Gao, Jiajie Qian, Ziming Wei, Bin Kong, Hong Zhang
Summary: A 3-dimensional enhanced heat pipe radiator has been developed to improve heat dissipation and temperature uniformity in cooling high-power electronic components. Experimental results show that the radiator has superior heat transfer performance compared to a conventional aluminum fin radiator under different heating powers and wind speed conditions.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Xinyi Zhang, Shuzhong Wang, Daihui Jiang, Zhiqiang Wu
Summary: This study focuses on recovering waste heat from blast furnace slag using dry centrifugal pelletizing technology. A comprehensive two-dimensional model was developed to analyze heat transfer dynamics and investigate factors influencing heat exchange efficiency. The findings have important implications for optimizing waste heat recovery and ensuring safe operations.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Xincheng Wu, An Zou, Qiang Zhang, Zhaoguang Wang
Summary: The boosting heat generation rate of high-performance processors is challenging traditional cooling techniques. This study proposes a combined design of active jet intermittency and passive surface modification to enhance heat transfer.
APPLIED THERMAL ENGINEERING
(2024)
