Article
Chemistry, Multidisciplinary
Mojtaba Edalatpour, Camryn L. Colon, Jonathan B. Boreyko
Summary: By using ice pellets instead of water droplets, nucleate boiling can be maintained up to 500 ℃, as the tandem phase-change processes at the solid-liquid and liquid-vapor interfaces dampen the rate of vapor generation.
Article
Thermodynamics
M. Esawy, Amir Hossein Nikoo, M. Reza Malayeri
Summary: The superiority of enhanced boiling on structured heat transfer surfaces is due to excessive bubble generation and behavior as well as the latent heat of evaporation. While these factors lead to higher heat transfer coefficients, they also accelerate fouling for aqueous solutions with inverse solubility. The study finds that Turbo-B tubes demonstrate better anti-fouling behavior compared to plain tubes and low finned tubes.
APPLIED THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Vladimir Serdyukov, Sergey Starinskiy, Ivan Malakhov, Alexey Safonov, Anton Surtaev
Summary: Surface modification using laser texturing shows great potential in enhancing heat transfer and increasing critical heat fluxes during pool boiling on metal surfaces. The experiments demonstrate that the laser-textured surface significantly improves heat transfer compared to untreated and polished surfaces. High-speed video recording analysis reveals that laser treatment leads to increased nucleation site density and frequency, as well as reduced bubble departure diameter.
APPLIED THERMAL ENGINEERING
(2021)
Article
Engineering, Chemical
Tianjiao Wang, Xingsen Mu, Shengqiang Shen, Gangtao Liang
Summary: In this study, the sessile droplet boiling on a micropillar array surface in the nucleate boiling regime is comprehensively investigated using a three-dimensional lattice Boltzmann model. The effects of micro-pillar size on bubble behaviors inside droplet are discussed in detail.
CHEMICAL ENGINEERING SCIENCE
(2023)
Article
Chemistry, Physical
Chang Guo, Can Ji, Yalong Kong, Zhigang Liu, Lin Guo, Yawei Yang
Summary: In this study, a modified molecular dynamics simulation was used to investigate bubble nucleation on rough nanostructured substrates with different liquid-solid interactions. The results show that as the contact angle decreases, the nucleation rate increases due to more thermal energy being transferred to the liquid on better-wetting surfaces. The rough profiles of the substrate provide nanogrooves that enhance initial bubble nucleation and improve thermal energy transfer efficiency. Additionally, atomic energies are calculated and adopted to explain the formation of bubble nuclei on various wetting substrates. The simulation results are expected to guide surface design in state-of-the-art thermal management systems, such as surface wettability and nanoscale surface patterns.
Article
Thermodynamics
Hong-Xia Chen, Lin-Han Li, Yi-Ran Wang, Yu-Xiang Guo
Summary: This study demonstrates through numerical simulations that a conceptual design of microstructured surfaces with time-varying wettability can enhance boiling heat transfer performance by reducing adhesion force on bubbles, increasing bubble departure frequency, forming thin liquid films to suppress dry spots, and increasing total evaporation rate. By modulating the wettability of the surface, the heat transfer efficiency can be significantly improved.
APPLIED THERMAL ENGINEERING
(2022)
Article
Thermodynamics
Zirui Li, Zhenyu Wang, Wei Shao, Qun Cao, Zheng Cui
Summary: The nucleate boiling process on rectangular grooved surfaces with varying aspect ratio is studied through molecular dynamics simulation. The rectangular grooves can significantly accelerate the initial bubble nucleation time and delay the transition from bubble nucleation to film boiling. However, when the groove width is extremely narrow, bubbles cannot be generated first due to the limitation of geometric structure and low potential energy region inside the groove.
THERMAL SCIENCE AND ENGINEERING PROGRESS
(2023)
Article
Nanoscience & Nanotechnology
Qi Liu, Yanwei Zhao, Yuxin Wu, Guangyu Qin, Guangde Li, Junfu Lyu
Summary: Salt solution pool boiling is important in thermal engineering equipment, but there is limited research on the impacts of salt concentration on boiling heat transfer coefficients. This experimental work aims to understand how dissolved salts affect pool boiling performance through surface wettability and bubble dynamics. The results show that the heat transfer coefficient is enhanced on the pin-fin heating surface but deteriorated on the bare heating surface with increasing salt concentration. Salt solution promotes bubble diameter and nucleate density by strengthening the hydrophobicity of the pin-fin surface, thus improving boiling heat transfer.
Article
Thermodynamics
Sandipan Deb, Mantu Das, Dipak Chandra Das, Sagnik Pal, Ajoy Kumar Das, Ranjan Das
Summary: The experimental study investigated the impact of surface modification on heat transfer phenomena under nucleate pool boiling configuration, showing that modification significantly enhances heat transfer coefficient. The findings were in agreement with existing literature and proposed a mathematical model to predict optimum heat transfer coefficients.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Thermodynamics
Lin Shi, Chengzhi Hu, Changli Yi, Jizu Lyu, Minli Bai, Dawei Tang
Summary: A model of nucleate boiling of liquid on the structured surface was constructed, and the processes of nucleate generation and bubble growth were directly observed using molecular dynamics simulation. The research found that the position and number of interfaces are mainly determined by the potential energy restriction generated by structures, which significantly affects the critical heat flux. In addition, liquid retention also affects interfaces and critical heat flux.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Physics, Applied
Navdeep S. S. Dhillon, Dilipkumar Choudhary, Jayden Maree, Victor Inhelder, Jazmin Guadarrama
Summary: Nucleate boiling is a crucial phenomenon in various industries, and improving its performance parameters has practical implications for power plants and electronics thermal management. However, studying this complex phenomenon has been challenging, hindering progress in boiling heat transfer enhancement. This paper introduces a laser-based technique for controlled bubble generation, allowing accurate phenomenological studies of the boiling process. The laser-nucleated controlled single bubble closely simulates naturally occurring bubbles in nucleate pool boiling, unlike existing artificial bubble generation approaches.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Nuclear Science & Technology
Ji-Hwan Park, Il Seouk Park, Daeseong Jo
Summary: Pool boiling experiments were conducted under isolated bubble regime at 0 degrees and 45 degrees inclination angles. Pressure, buoyancy, and surface tension forces played important roles as a bubble grew and departed from the heating surface. Curvature, base diameter, and bubble volume were used to calculate these forces, while contact angle, base diameter, and volume were evaluated using high-speed camera images. The contact angle equation proposed by Fritz was modified with the contact angles obtained in this study. The growth and departure of bubbles were discussed in relation to the forces of pressure, buoyancy, and surface tension.
NUCLEAR ENGINEERING AND TECHNOLOGY
(2023)
Review
Materials Science, Multidisciplinary
Jiaqian Li, Xing Han, Wei Li, Ling Yang, Xing Li, Liqiu Wang
Summary: This review discusses the role of reentrant features on surface and introduces design principles inspired by insects and plants. By quantitatively associating microscopic structural parameters with macroscopically visible wetting and adhesion properties, it evaluates how the design of reentrant features can enable exceptional superomniphobicity, strong adaptive adhesion, and directional fluidic navigation. The article also presents advanced manufacturing technologies for the realization of reentrant surfaces, potential applications, and scientific and technological challenges and opportunities.
PROGRESS IN MATERIALS SCIENCE
(2023)
Article
Thermodynamics
Siddharth Iyer, Apurv Kumar, Joe Coventry, Wojciech Lipinski
Summary: A mechanistic model is proposed to study the growth of a bubble in pool boiling, considering the change in shape of the bubble as it grows. The model consists of three sub-models for heat transfer, forces acting on the bubble, and the change in shape. The model is validated against experiments and simulations, showing good agreement in the bubble departure time, wall temperature, bubble shape, and microlayer profile.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2023)
Article
Thermodynamics
Min Yang, Zhongchao Zhao, Yanjie Zhang, Xiaojun Pu, Xiaofei Liu
Summary: The effects of ultrasonic waves on nucleate boiling heat transfer and bubble behavior of smooth and porous surfaces were studied. By altering the formation and evolution of bubbles, ultrasonic waves were used to enhance boiling heat transfer. Visualization experiments were conducted to investigate the pool boiling curves and bubble dynamics of smooth and sintered porous surfaces with ultrasonic waves. The results showed that ultrasonic waves increased the heat transfer coefficients of both surfaces, with the porous surface experiencing a greater enhancement. The departure diameters of bubbles on the porous surface were smaller than those on the smooth surface, making them more influenced by acoustic streaming.
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)