Article
Engineering, Multidisciplinary
Zhang ZhiWei, Hu DingHua, Li Qiang, Liu Chao, Zhou Fan
Summary: The study reveals that increasing superheat results in finer droplets and thinner liquid film, improving heat transfer efficiency. Expanding atomization angle benefits in reducing spray distance in flash spray cooling. The choice of nozzle is crucial for the cooling performance in flash spray, depending on the superheat level.
SCIENCE CHINA-TECHNOLOGICAL SCIENCES
(2021)
Article
Engineering, Chemical
Guangyu Guo, Bo Zhang, Chao Zhu, Zhiming Ji
Summary: Spray flash desalination is a phase-changing process where latent heat is self-supplied by evaporating droplets, creating a temperature difference between droplets and vapor for improved efficiency and energy recovery. An integrated experiment-modeling-CFD methodology was developed to study spray flash under active vacuuming, highlighting the thermal non-equilibrium phenomenon in efficient evaporation.
Article
Thermodynamics
Ren-Jie Ji, Dong-Qing Zhu, Xiang -Wei Lin, Zhi-Fu Zhou, Bin Chen
Summary: The study investigates the influence of spray chamber pressure, mass flow rate, and subcooling degree on the cooling capacity in flash spray cooling. It is found that initial increases in these parameters improve heat transfer performance, but further increases deteriorate the heat transfer. Atomization performance affected by the spray parameters is the main reason for the heat transfer.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Mechanics
Lin Ye, Hao Guo, Yinhai Zhu, Peixue Jiang
Summary: A three-dimensional compressible large eddy simulation (LES) method was used to study the flow and heat transfer characteristics in a crossflow film cooling model. The effects of crossflow on the flow field and film cooling effectiveness of different types of film holes, such as cylindrical holes and diffusion slot holes, were analyzed. The results showed the induction of helical motion in the holes under crossflow. Asymmetric outlet flow behavior was observed downstream due to the influence of crossflow. The blowing ratio affected the strength of the vortex inside the hole. For the diffusion slot hole, the high-speed zone at the hole-inlet gradually evolved into strip shapes under axial extrusion and spanwise diffusion. The film cooling effectiveness of the diffusion slot hole was less affected by the inlet crossflow and Reynolds number, and lateral diffusion capacity increased with the blowing ratio. The instantaneous film fluctuation region of the diffusion slot hole was smaller and more symmetrical compared to the cylindrical hole.
Article
Thermodynamics
Azzam S. Salman, Nabeel M. Abdulrazzaq, Amitav Tikadar, Saad K. Oudah, Jamil A. Khan
Summary: This study conducted experiments to investigate the effects of nozzle-to-surface distance, coolant flow rate, and temperature difference on the heat transfer characteristics of enhanced surfaces in a spray cooling system. The results showed that radial grooves and surface structures played a crucial role in improving heat transfer performance.
APPLIED THERMAL ENGINEERING
(2021)
Article
Thermodynamics
Arnab Karmakar, Dipanjan Kar, Adil Ahmad, Sumit Kumar Jana
Summary: A thermal desalination system has been designed with a flash drum, a spray-nozzle system, and a condenser under vacuum. The theoretical yield of water vapor in the vacuum flash drum has been evaluated based on conservation equations of mass and energy, showing an increase in yield with supersaturation and feed temperature, as well as with a decrease in droplet size. The design is based on evaporation time scale and theoretical yield, which have been validated with results from the literature.
HEAT AND MASS TRANSFER
(2022)
Article
Engineering, Chemical
Guangyu Guo, Chao Zhu, Zhiming Ji, Mengchu Zhou
Summary: This study proposes an integrated system model for an original spray flash vacuum distillation system that utilizes thermal non-equilibrium through active vapor extraction for internal heat recovery. The system consists of four interconnected sub-systems that describe the key processes involved. Experimental results show that the system can achieve efficient heat recovery and effectively analyze the impacts of various operational and parametric effects, providing valuable insights for system design and optimization.
Article
Engineering, Multidisciplinary
Mingrui Wang, Huiren Zhu, Cunliang Liu, Tao Guo, Li Zhang, Na Li
Summary: Based on numerical simulations, the study analyzed the heat transfer and flow field of a turbine vane to improve film cooling effectiveness. By replacing cylindrical film holes with laidback holes and V-crater holes, the overall cooling effectiveness increased while cascade pressure loss factors remained almost unchanged. Structural adjustments were made to the vane to analyze their effects, resulting in improved cooling performance with minimal increase in pressure loss factors.
ENGINEERING APPLICATIONS OF COMPUTATIONAL FLUID MECHANICS
(2022)
Article
Food Science & Technology
Yuan Chi, Mengmeng Lin, Daming Zuo, Hailing Wang, Yujie Chi
Summary: This study utilized pressure-vacuum experiment equipment to reuse waste eggshells and established an innovative and environmentally friendly method for separating eggshell membranes and eggshells. The experimental results provide guidance for further research on the separation of eggshells and eggshell membranes, and offer a new solution for the recycling of waste eggshells.
JOURNAL OF FOOD SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Guoqiang Dun, Xingpeng Wu, Xinxin Ji, Yuhan Wei
Summary: This study designs a spiral-pushing fertilizer applicator to achieve precise control of fertilizer discharge by using a structure of variable diameter and variable spiral pitch. Through quadratic orthogonal rotation combination design experiments, the fertilizer discharge performance of the applicator is optimized. The experimental results indicate that spiral pitch and rotational speed have an extremely significant impact on the filling coefficient, and spiral pitch and rotational speed have an extremely significant impact on the particle axial velocity coefficient.
APPLIED SCIENCES-BASEL
(2023)
Article
Construction & Building Technology
Zhengcheng Fang, Youming Chen, Zhengtao Ai, Hongqiang Li
Summary: In the context of air-conditioning system design, the coincident design day (CDD) improves the accuracy of indoor design cooling load calculations by considering the simultaneous occurrence of design weather elements and the correlation between design weather data and room parameters. Atypical situations, especially those of exterior walls, are more common in CDD applications. In this study, the orientation coefficient method and the mode coefficient method were proposed to correct the peak cooling loads of atypical situations when calculated using the CDD of typical situations, showing promising results.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Multidisciplinary Sciences
Zihao Yuan, Ayse K. Coskun
Summary: This article introduces a deep learning-based cooling design optimization flow to address the heat dissipation issues caused by ultra-high chip power densities. The flow can rapidly and accurately determine the optimal cooling solution and parameters for a given chip.
Article
Energy & Fuels
Saeed Jowkar, Xing Shen, Ghader Olyaei, Mohammad Reza Morad, Amirhooshang Zeraatkardevin
Summary: In this study, a comprehensive 3D numerical simulation is conducted to simulate spray cooling on a multijunction HCPV. The results show that spray cooling can reduce the temperature of the solar cell, but it also decreases the cell's output power.
Article
Thermodynamics
Kunal Sandip Garud, Seong-Guk Hwang, Jeong-Woo Han, Moo-Yeon Lee
Summary: This study experimentally investigated the performance characteristics of a direct spray oil cooling system, and explored the effects of nozzle type, cooling oil type, and flow rate on the performance characteristics. The results showed that the combination of dielectric oil and full cone-1 nozzle exhibited superior performance characteristics.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Energy & Fuels
Chu-Qi Su, Shuo Wang, Xun Liu, Qi Tao, Yi-Ping Wang
Summary: In this study, a method of spray cooling the radiator using water produced by the fuel cell was proposed to address the heat transfer problem in fuel cell vehicles during climbing and high temperature conditions. A test bench was constructed to evaluate the effectiveness of this method and determine the optimal spray working conditions. Numerical simulation and experimental verification were conducted to study the convective heat transfer coefficient of the radiator's air side. The results demonstrated that inclined spray was more effective than vertical spray, and the numerical simulation process provided valuable reference for the design of fuel cell vehicle spray cooling system.
Article
Thermodynamics
Jian Chen, Shuang-Gen Yang, Rui Zhao, Wen -Long Cheng
Summary: This study experimentally investigates the heat transfer characteristics of S-CO2 in tubes with different roughness. The results reveal that rough walls help alleviate heat transfer deterioration, and a heat transfer correlation for rough tubes is proposed.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Thermodynamics
Yu -Hui Pan, Rui Zhao, Yong -Le Nian, Wen -Long Cheng
Summary: A pin-fin staggered manifold microchannel heat sink is proposed in this paper to enhance the heat dissipation performance of conventional manifold microchannel heat sink. The heat transfer performance of the proposed heat sink is compared with rectangular manifold microchannel and pin-fin manifold microchannel using single-phase flow numerical simulation. The results show that the proposed heat sink has better heat transfer capability and more uniform heating surface temperature.
APPLIED THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Li-Kai Mao, Rui Zhao, Jiong Chen, Wen-Long Cheng
Summary: A convenient and efficient anisotropic thermal conductivity prediction model for composite phase change materials (CPCMs) was proposed. The model calculates the angular distribution of thermal conductivity particles in CPCMs quantitatively and shows good agreement with experimental values. The study found that the ellipsoidal thermal conductivity particles tended to be distributed horizontally with increasing compression ratio, resulting in more obvious anisotropy in the thermal conductivity of CPCMs. By adjusting the particle parameters, the radial thermal conductivity of CPCMs can be improved.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Thermodynamics
Hao Fu, Rui Zhao, Lei Zheng, Jun Liu, Wenlong Cheng
Summary: In this paper, the combination of spray cooling technology and non-azeotropic mixture was proposed to achieve precise temperature control of a heated surface. Experiments were conducted to study the spray cooling heat transfer of a non-azeotropic mixture in the boiling region. The results showed that there exists an optimal mixing ratio for the non-azeotropic mixture, which results in the best surface uniformity and heat transfer performance. Further studies also revealed the weakening of spray heat transfer performance at low heat flow in the two-phase region, but the non-azeotropic mixture gradually outperformed single component R142b with increasing heat flux.
APPLIED THERMAL ENGINEERING
(2023)
Article
Mechanics
Lei Zheng, Rui Zhao, Yong-Le Nian, Jun Liu, Wen-Long Cheng
Summary: This paper investigates the influence of nozzle's tangential velocity to axial velocity ratio and swirl diversion channel eccentric distance on spray parameters. Results show that both parameters have a linear relationship with the peak location of each spray parameter.
Article
Thermodynamics
Hui Liang, Rui Zhao
Summary: A dynamic model and a model predictive temperature control algorithm for a closed-loop spray cooling system were proposed. The algorithm could accurately estimate sudden changes in heat load and plan an optimized control path to achieve temperature stability. Simulation results showed that the algorithm outperformed PID in terms of temperature stability, with shorter peak and settling times, and smaller temperature offset. Experimental data validated the accuracy of the simulation results.
APPLIED THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Jian Chen, Rui Zhao, Yong-Le Nian, Wen-Long Cheng
Summary: This study investigated the effects of cylindrical roughness tubes on heat transfer and entropy generation of S-CO2. The results show that rough tubes can improve heat transfer performance and reduce irreversibility. This study provides references for enhancing heat transfer and designing related components.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Thermodynamics
Kun-Ru Wang, Jian Chen, Rui Zhao, Wen -Long Cheng
Summary: This study experimentally investigates the impact of transverse vibration on heat transfer characteristics of S-CO 2 in a 1200 mm tube. The results demonstrate that vibration significantly enhances the heat transfer of S-CO 2. The heat transfer enhancement efficiency (HTE) tends to rise with the increase of vibration amplitude, frequency, mass flux, or pressure, and the HTE of the upper vertex is better than the lower vertex. Within the tested range, the highest average HTE is 10.2%. The local HTE in the pseudo critical region is much more noteworthy than in other regions. Finally, a heat transfer correlation is proposed based on the experimental findings, with 95.6% of the data error within ±15%.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Thermodynamics
Hua Chen, Wen-long Cheng, Yong-le Nian
Summary: This paper analyzes the liquid-gas heat transfer characteristics of a near isothermal compressed air energy storage system based on spray injection. The results show that spray injection can effectively enhance heat transfer and suppress air temperature change, with a more obvious effect in small-scale CAES. It is recommended to use low water flow rate and large working cylinder volume to achieve slow compression and expansion processes for high efficiency near isothermal CAES.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Thermodynamics
Wei Zhang, Rui Zhao, Wen-Long Cheng
Summary: PTC materials have the potential to replace complex temperature control systems in space applications due to their ability to combine heating, temperature measurement, and temperature control. This study investigates the temperature control effect and criteria of PTC materials in dynamic thermal environments using theoretical derivation and numerical simulation methods. The research reveals that material property parameters and ambient temperature significantly influence the temperature control accuracy and response speed. The findings also indicate that certain parameters can improve both the control accuracy and the response time. The study provides temperature control laws and theoretical foundations for the regulation and optimization of material properties and the use of PTC thermal control in space applications.
THERMAL SCIENCE AND ENGINEERING PROGRESS
(2023)
Article
Thermodynamics
Jian Chen, Hua Chen, Rui Zhao, Jia-Liang Song, Yong-Le Nian, Wen-Long Cheng
Summary: This study conducted experimental studies in a high p/C spiral tube and compared it with a straight tube. The results showed that the spiral tube can improve heat transfer efficiency and has less impact from buoyancy effect compared to the straight tube.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(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)