Article
Thermodynamics
Alok Kumar, Suneet Singh
Summary: Heat pipes are used for high-heat transfer in electronic devices. The operation of Pulsating Heat Pipe is not fully understood due to the complexities involved. A phenomenological model has been developed to explain the thermodynamic processes, and the oscillatory behavior of the liquid slug is modeled. The onset of chaotic regimes in the heat transfer has not been addressed in previous works.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2023)
Article
Engineering, Mechanical
Shung-Wen Kang, Chien-Hsuan Chan, Pai-Chun Hsiao
Summary: This research utilized specific dimensions of glass tubes to manufacture a closed-loop pulsating heat pipe and evaluated its thermal resistance and circulation characteristics through experiments. The results showed that the heat pipe achieved fully circulation under specific filling ratios and input powers, with minimal thermal resistance.
JOURNAL OF THE CHINESE SOCIETY OF MECHANICAL ENGINEERS
(2022)
Article
Thermodynamics
Sai Kiran Hota, Kuan-Lin Lee, Brett Leitherer, George Elias, Greg Hoeschele, Srujan Rokkam
Summary: Two-phase-based heat spreaders are highly sought after for electronics cooling due to their superior thermal performance. Pulsating Heat Pipes (PHPs) offer thickness, shape, and cost advantages over Embedded Heat Pipe (EHP) spreaders. The thermal performance of PHP with different fluids was experimentally determined and compared to EHP. A mathematical model was developed and validated. Propylene-filled PHP performs similarly or better than EHP at low sink temperatures but dries out faster at moderate temperatures. PHP with R245fa and acetone improves with increasing power but has lower thermal conductivity compared to EHP. PHP is lighter than EHP based on weight comparison.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Larissa Krambeck, Kelvin G. Domiciano, Luis A. Betancur-Arboleda, Marcia B. H. Mantelli
Summary: This article introduces an improved flat plate pulsating heat pipe with channel modification in the evaporator region, resulting in ultra sharp lateral grooves, to enhance heat transfer performance. Experimental results show that the ultra sharp grooves, acting as artificial nucleation sites and capillary medium, can delay dry-out and make the device suitable for application in microgravity environments.
APPLIED THERMAL ENGINEERING
(2022)
Article
Thermodynamics
Araf Mim Ahmed Smrity, Peng Yin
Summary: This study aims to investigate the performance enhancement of pulsating heat pipes (PHP) using HNF consisting of metallic and metallic oxide nanoparticles, and compare it with different working fluids. The results showed that Al2O3-Cu HNF achieved lower thermal resistance compared to water and mono nanofluids, indicating superior heat transfer enhancement. The optimal condition was a 60% filling ratio and a 0.2% weight concentration of nanoparticles.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Makiko Ando, Atsushi Okamoto, Hiroki Nagai
Summary: The study investigated the effects of check valve layout on the start-up and heat transfer characteristics of an Oscillating Heat Pipe with Check Valves (CVOHP), finding that locating all the check valves near the condenser or in an alternate arrangement can improve start-up characteristics, with no significant difference in steady-state thermal performance depending on the check valve layout. The optimal check valve layout could help achieve high start-up reliability and high steady-state thermal performance for the CVOHP.
APPLIED THERMAL ENGINEERING
(2021)
Article
Thermodynamics
Bineeta Singh, Pradeep Kumar
Summary: This paper experimentally investigates the heat transfer enhancement parameter of a four turns pulsating heat pipe (PHP) under different filling ratios and heat inputs. It is found that higher filling ratios facilitate better heat transfer and self-rewetting fluid performance at lower heat inputs. The study also explains the physical mechanisms of PHP thermal performance, including Marangoni effect, capillary effect, and wettability.
THERMAL SCIENCE AND ENGINEERING PROGRESS
(2021)
Article
Thermodynamics
Zhanxiao Kang, Dahua Shou, Jintu Fan
Summary: This study proposed a novel pulsating heat pipe with separating walls, which was found to have the best thermal performance at a filling ratio of 70%. The separating walls located at different positions within the flow channel showed varying effects on the equivalent thermal conductivity, with the separating wall at the middle of the flow channel performing best at the filling ratio of 70%.
APPLIED THERMAL ENGINEERING
(2021)
Article
Energy & Fuels
Jiangchuan Yu, Sihui Hong, Sasaki Koudai, Chaobin Dang, Shuangfeng Wang
Summary: This paper introduces a flat plate pulsating heat pipe (ASCPHP) with adaptive structured channels to enhance the thermal performance of PHP systems. Compared to traditional PHP systems, the ASCPHP design achieves a lower evaporation temperature and a more uniform temperature distribution, reducing thermal resistances by up to 37.5%. Experimental results show that the ASCPHP exhibits the quickest start-up response and the lowest start-up temperature, with minimal dependence on gravity.
Article
Thermodynamics
Sizhuo Li, Zhicheng Bu, Tiegen Fang, Yubo Wang, Yunwei Shen, Xuan Tao, Bo Jiao, Zhihua Gan
Summary: A simultaneous thermal and visual experiment was conducted on a silicon-based flat-plate nitrogen pulsating heat pipe (PHP) for the first time. The start-up and quasi-steady state performances were analyzed, revealing two types of start-up processes and different degrees of thermal performance hysteresis phenomenon. The optimal thermal resistance was found to be lower in a lower filling ratio working condition, while a lower filling ratio resulted in a lower heat transfer limit. The latent heat transfer efficiency in the nitrogen PHP was inferred to be higher than that of the sensible heat transfer.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2023)
Article
Thermodynamics
Koji Fumoto, Keiko Ishii
Summary: A study found that highly efficient heat transport can be achieved when the filling ratio of a pulsating heat pipe (PHP) is extremely low. The experiment used a flat aluminum tube with 28 straight channels and obtained a minimum thermal resistance of 0.021 K/W and a temperature difference of less than 1.0 K between the evaporating and condensing sections.
APPLIED THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Jingru Zhan, Xi Chen, Yuzhe Ji, Hua Zhang
Summary: A three-dimensional cylindrical copper pulsating heat pipe (PHP) with ethane as the working fluid is designed and experiments are conducted to study its thermal performance under asymmetric heating mode. The evaporation section is divided into two parts with different heat inputs to investigate temperature oscillation and heat transfer performance. Results show that the optimal working temperature is -40 degrees C and heating on the left evaporator relieves stagnation and promotes flow motion.
APPLIED THERMAL ENGINEERING
(2023)
Article
Thermodynamics
L. H. Saw, M. C. Yew, M. K. Yew, W. T. Chong, H. M. Poon, W. S. Liew, W. H. Yeo
Summary: This study introduces a closed loop pulsating heat pipe (CLPHP) roof cooling system, which is investigated for its thermal performance through experiments and comparison. The experiment results show that the cool roof system with CLPHP technology can significantly lower the attic temperature compared to the bare metal roof design, making it a promising method for improving thermal comfort in buildings.
CASE STUDIES IN THERMAL ENGINEERING
(2021)
Article
Thermodynamics
Est Dev Patel, Subrata Kumar
Summary: The thermal performance of an asymmetric single-turn closed-loop pulsating heat pipe (aCLPHP) was experimentally investigated. The working fluids exhibited a two-phase oscillatory-circulatory flow in the asymmetric closed-loop due to the capillary pressure difference. The use of adiabatic channels of different cross-sections resulted in a pressure difference, enhancing the flow of heated vapor and liquid. The asymmetry increased the heat carrying capacity for water and acetone by 75% and 50% respectively. The introduction of an asymmetric adiabatic section is a simple and cost-effective approach to improve the capability of a single-turn CLPHP for thermal management.
APPLIED THERMAL ENGINEERING
(2023)
Article
Mechanics
Gampala Durga Priyadarsini, Gurunath Sankad
Summary: This research focuses on addressing a critical issue in modern microelectronics by studying pulsatile heat pipes and microfluidics. The study demonstrates the accuracy and efficiency of the heat transfer solution and highlights the advantages of pulsatile flows in microfluidic systems, providing promising avenues for future research.
Article
Thermodynamics
Y. Maydanik, V. Pastukhov, M. Chernysheva
APPLIED THERMAL ENGINEERING
(2018)
Article
Physics, Applied
V. I. Dmitrin, Yu. F. Maydanik
Article
Thermodynamics
Navin Subbaiah Ramasamy, Prem Kumar, Bhimashankar Wangaskar, Sameer Khandekar, Yuri F. Maydanik
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2018)
Article
Thermodynamics
Y. F. Maydanik, S. V. Vershinin, M. A. Chernysheva
APPLIED THERMAL ENGINEERING
(2018)
Article
Thermodynamics
V. G. Pastukhov, Yu F. Maydanik
APPLIED THERMAL ENGINEERING
(2018)
Article
Thermodynamics
M. A. Chernysheva, Y. F. Maydanik
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2019)
Article
Thermodynamics
Prem Kumar, Sameer Khandekar, Yuri F. Maydanik, Bishakh Bhattacharya
JOURNAL OF HEAT TRANSFER-TRANSACTIONS OF THE ASME
(2019)
Article
Physics, Applied
V. G. Pastukhov, Yu. F. Maydanik
Article
Thermodynamics
Y. F. Maydanik, S. V. Vershinin, M. A. Chernysheva
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2020)
Article
Thermodynamics
Y. Maydanik, S. Vershinin, M. Chernysheva
Summary: This study investigated the thermal characteristics of a 10mm thick flat evaporator, showing a significant correlation between thermal resistance and heat flux density with the size of heat source's thermocontact surface. The minimum thermal resistance values were observed at higher heat flux densities.
APPLIED THERMAL ENGINEERING
(2021)
Article
Thermodynamics
Vladimir G. Pastukhov, Yury F. Maydanik
Summary: The experimental investigation involved using a thermoelectric converter to actively control a loop heat pipe, with results showing that the method is most efficient at slope angles from 0 degrees to +90 degrees, maintaining the heat source temperature accurate to +/- 0.2 degrees C with energy expenditure not exceeding 8% of the power of the heat source.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2022)
Article
Thermodynamics
Yu F. Maydanik, S. V. Vershinin, M. A. Chernysheva
Summary: Comparison tests were conducted on a flat-oval evaporator and a flat disk-shaped evaporator, showing that the evaporator with a longitudinal replenishment of the evaporation zone has a lower operating temperature and thermal resistance, making it suitable for cooling systems in high-power electronics.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Thermodynamics
Yury Maydanik, Mariya Chernysheva, Sergey Vershinin
JOURNAL OF THERMOPHYSICS AND HEAT TRANSFER
(2020)
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)