Case Studies in Thermal Engineering最新文献

Numerical analysis and experimental study of two-phase flow pattern and pressure drop characteristics in internally microfin tubes 内部微鳍管内两相流模式和压降特性的数值分析和实验研究

IF 6.8 2区工程技术

Case Studies in Thermal Engineering Pub Date : 2024-11-18 DOI: 10.1016/j.csite.2024.105521

Jingzhi Zhang, Liangliang Zhang, Bo Zhang, Naixiang Zhou, Li Lei, Bangming Li

{"title":"Numerical analysis and experimental study of two-phase flow pattern and pressure drop characteristics in internally microfin tubes","authors":"Jingzhi Zhang, Liangliang Zhang, Bo Zhang, Naixiang Zhou, Li Lei, Bangming Li","doi":"10.1016/j.csite.2024.105521","DOIUrl":"https://doi.org/10.1016/j.csite.2024.105521","url":null,"abstract":"Microfin tubes with internal structures exhibit superior thermo-hydraulic performance, making them indispensable in systems such as air conditioning, chemical industry, and heat pumps. Despite their widespread application, research on microfin tubes has predominantly concentrated on single-phase flows. The heat transfer coefficient of phase change heat transfer is much higher than that of single-phase heat transfer. The higher heat transfer coefficient enables micro finned tubes using phase change heat transfer to significantly improve heat transfer efficiency while reducing equipment size. The understanding of gas-liquid two-phase flow characteristics is crucial for heat and mass transfer rates and pressure drop. This study examines the two-phase flow patterns and pressure drop characteristics within microfin tubes, considering variables such as two-phase Reynolds number (200≤Re ≤ 600), gas void fraction (0.3≤<ce:italic>ζ</ce:italic> ≤ 0.55), tube inner diameter (2.5≤<ce:italic>d</ce:italic> ≤ 5 mm), helix angle (0°≤<ce:italic>β</ce:italic> ≤ 36°), and microfin count (20≤<ce:italic>N</ce:italic><ce:inf loc=\"post\">s</ce:inf> ≤ 60) through both experimental and numerical approaches. The findings reveal that the inlet Reynolds number and microfin count exert negligible effects on bubble dimensions and morphology. As the gas void fraction and helix angle increase, the gas-liquid interfacial profiles become more symmetric. The influence of changes in bubble length and gas void fraction on bubble velocity can be ignored. When the helix angle is 18°, friction resistance factor in the liquid column region is the minimum of 0.04. The friction resistance factor in the liquid column region decreases with the increase of two-phase Reynolds number and microfin count, and decreases with the decrease of gas void fraction and tube inner diameter.","PeriodicalId":9658,"journal":{"name":"Case Studies in Thermal Engineering","volume":"19 1","pages":""},"PeriodicalIF":6.8,"publicationDate":"2024-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142679201","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A novel high-temperature water cooling system utilizing cascaded cold energy from underground water plants in northern China 利用中国北方地下水厂级联冷能的新型高温水冷却系统

IF 6.8 2区工程技术

Case Studies in Thermal Engineering Pub Date : 2024-11-18 DOI: 10.1016/j.csite.2024.105504

Chuanmin Tai, Yunqing Zhang, Zhanli Liu, Xingliang Ji, Wenjun Lei, Guansan Tian

{"title":"A novel high-temperature water cooling system utilizing cascaded cold energy from underground water plants in northern China","authors":"Chuanmin Tai, Yunqing Zhang, Zhanli Liu, Xingliang Ji, Wenjun Lei, Guansan Tian","doi":"10.1016/j.csite.2024.105504","DOIUrl":"https://doi.org/10.1016/j.csite.2024.105504","url":null,"abstract":"In alignment to China's ambitious ‘Dual Carbon' strategy and the urgent need to address energy shortages, optimizing energy consumption in air conditioning systems has become a critical imperative in thermal engineering.This study introduces an innovative high-temperature water cooling system that leverages cascaded cold energy from underground water plants in northern China. Initially, the DeST software was utilized to simulate and quantify the hourly cooling load and annual cooling consumption of a representative building. Subsequently, based on these simulation results, a comprehensive case study was conducted on an air conditioning project in Jinan city, Shandong Province, to rigorously analyze the proposed system's performance in terms of energy efficiency, economic feasibility, and environmental impact.The results demonstrate significant improvements over conventional air conditioning systems: a 24.6 % increase in energy efficiency, corresponding to a reduction of 4.7 kWh/m<ce:sup loc=\"post\">2</ce:sup> in energy consumption and cost savings of 2.5 CNY/m<ce:sup loc=\"post\">2</ce:sup>. The economic viability of the system extends to a radius of 3.5 km from the underground water plant. Projections for a typical cooling season indicate potential electricity savings of approximately 691,000.0 kWh, translating to emission reductions of 691.0 tons of CO<ce:inf loc=\"post\">2</ce:inf>, 20.7 tons of SO<ce:inf loc=\"post\">2</ce:inf>, and 10.4 tons of NOx.","PeriodicalId":9658,"journal":{"name":"Case Studies in Thermal Engineering","volume":"8 1","pages":""},"PeriodicalIF":6.8,"publicationDate":"2024-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142679202","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Performance evaluation of supercritical CO2 Brayton cycle with two-stage compression and intercooling 采用两级压缩和中冷技术的超临界二氧化碳布雷顿循环性能评估

IF 6.8 2区工程技术

Case Studies in Thermal Engineering Pub Date : 2024-11-17 DOI: 10.1016/j.csite.2024.105503

Jiahui Jiang, Yongqiang Yu, Yuanyang Zhao, Guangbin Liu, Qichao Yang, Yunxia Liu, Liansheng Li

{"title":"Performance evaluation of supercritical CO2 Brayton cycle with two-stage compression and intercooling","authors":"Jiahui Jiang, Yongqiang Yu, Yuanyang Zhao, Guangbin Liu, Qichao Yang, Yunxia Liu, Liansheng Li","doi":"10.1016/j.csite.2024.105503","DOIUrl":"https://doi.org/10.1016/j.csite.2024.105503","url":null,"abstract":"Due to its small structures and high energy efficiency, the Brayton cycle using supercritical carbon dioxide (sCO<ce:inf loc=\"post\">2</ce:inf>) can be implemented in various energy industries. The simulation model for a sCO<ce:inf loc=\"post\">2</ce:inf> recompression Brayton (RB) system with a two-stage compression and intercooling process (TCIP) is developed. At the design working conditions, there are minimum and optimum split ratios for the sCO<ce:inf loc=\"post\">2</ce:inf> RB with TCIP cycle. The sCO<ce:inf loc=\"post\">2</ce:inf> RB with TCIP cycle has a broader range of split ratios compared to the RB cycle. The sCO<ce:inf loc=\"post\">2</ce:inf> RB with TCIP cycle can achieve a minimum split ratio of 0.315, compared to 0.36 for the sCO<ce:inf loc=\"post\">2</ce:inf> RB cycle. The maximum efficiency of the sCO<ce:inf loc=\"post\">2</ce:inf> RB with TCIP cycle is 50.95 %, which surpasses the efficiency of the sCO<ce:inf loc=\"post\">2</ce:inf> RB cycle by 3.14 %. There exists an optimal value for the first-stage pressure ratio because the maximum efficiency of the sCO<ce:inf loc=\"post\">2</ce:inf> RB with the TCIP system tends to increase and then decrease with the increase in the first-stage pressure ratio. The pressure ratio of 1.1 for the first-stage compressor, corresponding to an interstage pressure of 8.25 MPa, maximizes the efficiency of the sCO<ce:inf loc=\"post\">2</ce:inf> RB with the TCIP cycle. The results can be used to further explore the applicability of sCO<ce:inf loc=\"post\">2</ce:inf> RB with TCIP.","PeriodicalId":9658,"journal":{"name":"Case Studies in Thermal Engineering","volume":"3 1","pages":""},"PeriodicalIF":6.8,"publicationDate":"2024-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142679204","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

On the effects of oxygen fraction on stability and combustion characteristics of dual-swirl oxy-methane flames: An experimental and numerical study 氧分数对双漩涡全氧甲烷火焰稳定性和燃烧特性的影响：实验和数值研究

IF 6.8 2区工程技术

Case Studies in Thermal Engineering Pub Date : 2024-11-17 DOI: 10.1016/j.csite.2024.105519

Mohamed Hamdy, Mohammed El-Adawy, Ahmed Abdelhalim, Ahmed Abdelhafez, Medhat A. Nemitallah

{"title":"On the effects of oxygen fraction on stability and combustion characteristics of dual-swirl oxy-methane flames: An experimental and numerical study","authors":"Mohamed Hamdy, Mohammed El-Adawy, Ahmed Abdelhalim, Ahmed Abdelhafez, Medhat A. Nemitallah","doi":"10.1016/j.csite.2024.105519","DOIUrl":"https://doi.org/10.1016/j.csite.2024.105519","url":null,"abstract":"The effects of oxygen fractions of primary and secondary streams on flow/flame interactions, flame stability and macrostructure, and combustion and emissions characteristics of premixed oxy-methane (CH4/CO2/O2) flames were studied experimentally and numerically in a dual annular counter-rotating swirl (DACRS) burner for applications of clean power production in gas turbines. The primary stream oxygen fractions (OF<ce:inf loc=\"post\">p</ce:inf>) of 34 % and 25 % were paired with secondary stream oxygen fractions (OF<ce:inf loc=\"post\">s</ce:inf>) ranging from 25 % to 39 % at fixed primary stream equivalence ratio (φ<ce:inf loc=\"post\">p</ce:inf> = 0.9), fixed velocity ratio of 3.0 by the primary (of 5 m/s) and secondary (of 1.667 m/s) streams, and over ranges of secondary stream equivalence ratios (φ<ce:inf loc=\"post\">s</ce:inf>). The results showed that at OF<ce:inf loc=\"post\">p</ce:inf> = 34 % and OF<ce:inf loc=\"post\">S</ce:inf> = 39 %, the pilot flame supports a lean secondary flame down to φ<ce:inf loc=\"post\">s</ce:inf> = 0.434 at combustor global equivalence ratio (φ<ce:inf loc=\"post\">g</ce:inf>) of 0.467. Flame flashback concerns were not seen in the operative OF<ce:inf loc=\"post\">s</ce:inf> zone until the secondary stream reached stoichiometric operation (<ce:italic>φ</ce:italic><ce:inf loc=\"post\">s</ce:inf> = 1.0). The widths and forms of the inner and outer recirculation zones (IRZ and ORZ) are not significantly affected by changes in OF. Reducing φ<ce:inf loc=\"post\">g</ce:inf> and OF<ce:inf loc=\"post\">g</ce:inf> resulted in decreases in Damköhler number (Da), laminar flame speed, and CO emissions.","PeriodicalId":9658,"journal":{"name":"Case Studies in Thermal Engineering","volume":"15 1","pages":""},"PeriodicalIF":6.8,"publicationDate":"2024-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142679219","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Combustion characteristics of a 660 MW tangentially fired pulverized coal boiler considering different loads, burner combinations and horizontal deflection angles 考虑到不同负荷、燃烧器组合和水平偏转角，660 兆瓦切向燃烧煤粉锅炉的燃烧特性

IF 6.8 2区工程技术

Case Studies in Thermal Engineering Pub Date : 2024-11-17 DOI: 10.1016/j.csite.2024.105520

Wenbo Gu, Zipeng Zheng, Naixin Zhao, Xiaojian Wang, Zening Cheng

{"title":"Combustion characteristics of a 660 MW tangentially fired pulverized coal boiler considering different loads, burner combinations and horizontal deflection angles","authors":"Wenbo Gu, Zipeng Zheng, Naixin Zhao, Xiaojian Wang, Zening Cheng","doi":"10.1016/j.csite.2024.105520","DOIUrl":"https://doi.org/10.1016/j.csite.2024.105520","url":null,"abstract":"In the context of transitioning energy structures, thermal power generation is adapting to peak load regulation, highlighting the need for comprehensive studies on boiler combustion characteristics under varying load conditions. This study focuses on a 660 MW tangentially fired boiler, evaluating its combustion and pollutant generation at different operational loads: boiler maximum continuous rate (BMCR), turbine heat acceptance (THA), 75% of THA, and 40% of THA. The findings reveal a general decline in temperature, and nitrogen oxide concentration as the load decreases. However, at 40% THA, increased oxygen mole fractions lead to higher carbon dioxide and sulfur dioxide levels compared to other conditions. Through the Analytic Network Process, each parameter's impact is evaluated and scored to identify the most effective burner and deflection angle combinations. Optimal configurations are identified: a 10-degree rightward adjustment for ABDE layer burners at BMCR and a 10-degree leftward adjustment for BD layer burners at 40% THA, both enhancing combustion performance and reducing pollutants at the furnace outlet. For THA and 75% THA conditions, the industrial standard combination is recommended.","PeriodicalId":9658,"journal":{"name":"Case Studies in Thermal Engineering","volume":"66 1","pages":""},"PeriodicalIF":6.8,"publicationDate":"2024-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142679203","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Research on the mechanical and thermal properties of potting adhesive with different fillers of h-BN and MPCM 含 h-BN 和 MPCM 不同填料的灌封胶的机械和热性能研究

IF 6.8 2区工程技术

Case Studies in Thermal Engineering Pub Date : 2024-11-17 DOI: 10.1016/j.csite.2024.105510

Jing Xu, Xiang Wang, Meng Zhang

{"title":"Research on the mechanical and thermal properties of potting adhesive with different fillers of h-BN and MPCM","authors":"Jing Xu, Xiang Wang, Meng Zhang","doi":"10.1016/j.csite.2024.105510","DOIUrl":"https://doi.org/10.1016/j.csite.2024.105510","url":null,"abstract":"Using packaging materials to reduce contact thermal resistance has become a promising method to solve the problem of insufficient heat dissipation capacity of electronic components. The purpose of this work is to optimize the mechanical and thermodynamic performance of potting adhesive using phase change microcapsules (MPCM) and hexagonal boron nitride nano-powder (h-BN) as thermal conductive fillers. The experimental results indicated that h-BN has a positive effect on the tensile strength of the potting adhesive, with a 7.1 % increase in tensile strength at a mass fraction of 30 %. However, the addition of MPCM will weaken the tensile strength of the potting adhesive. Adding MPCM and h-BN can both effectively improve the thermal conductivity of the potting adhesive: when the filler mass fraction is lower than 20 %, the potting adhesive with MPCM filler exhibits more strengthening capability than h-BN type; while with the continuous increase of filler mass fraction, the thermal conductivity of the potting adhesive with h-BN filler is better. The thermal buffering capacity of the potting adhesive significantly increases with the mass fraction of MPCM, while the effect of h-BN on thermal buffering capacity is not significant. In addition, the addition of h-BN and MPCM significantly improves the temperature uniformity of the potting adhesive.","PeriodicalId":9658,"journal":{"name":"Case Studies in Thermal Engineering","volume":"129 1","pages":""},"PeriodicalIF":6.8,"publicationDate":"2024-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142679206","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Intelligent adjustment ventilation duct design and numerical simulation study on enhancement of subgrade thermal stability in cold regions 提高寒冷地区基层热稳定性的智能调节通风管道设计与数值模拟研究

IF 6.8 2区工程技术

Case Studies in Thermal Engineering Pub Date : 2024-11-16 DOI: 10.1016/j.csite.2024.105502

Zhijun Zhao, Yongtao Wang, Aiting Sang, Xiangtian Xu, Lingxiao Fan, Wenbin Huang, Yuhang Liu

{"title":"Intelligent adjustment ventilation duct design and numerical simulation study on enhancement of subgrade thermal stability in cold regions","authors":"Zhijun Zhao, Yongtao Wang, Aiting Sang, Xiangtian Xu, Lingxiao Fan, Wenbin Huang, Yuhang Liu","doi":"10.1016/j.csite.2024.105502","DOIUrl":"https://doi.org/10.1016/j.csite.2024.105502","url":null,"abstract":"Traditional ventilation duct systems for embankments in cold regions are limited in their ability to regulate ventilation, which restricts their cooling effectiveness on the subgrade. This study introduces a design method for an Intelligent Adjustment Ventilation Embankment (IAVE) system that dynamically adjusts the ventilation status within the duct based on variations in ground and air temperatures. Numerical simulations were performed to compare the cooling performance and differential settlement control of the Normal Ventilation Embankment (NVE), Temperature-Controlled Ventilation Embankment (TCVE), and IAVE systems. The results demonstrated that, compared to NVE and TCVE, the IAVE system achieved more precise temperature regulation, optimized the use of environmental cooling energy, and exhibited superior long-term cooling and differential settlement control. Among the three main factors influencing IAVE performance—ventilation duct burial spacing, burial depth, and airflow velocity—the burial spacing has the most significant impact on the Artificial Permafrost Table (APT). It not only enhances cooling during cold seasons but also effectively mitigates the re-warming of the subgrade during warm seasons. This research offers an efficient, low-carbon energy utilization structure and provides calculation results to improve the thermal stability of engineering projects in cold regions.","PeriodicalId":9658,"journal":{"name":"Case Studies in Thermal Engineering","volume":"179 1","pages":""},"PeriodicalIF":6.8,"publicationDate":"2024-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142679212","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Evaluation of photovoltaic thermal system performance with different nanoparticle sizes via energy, exergy, and irreversibility analysis 通过能量、放能和不可逆分析评估不同纳米粒子尺寸的光伏热系统性能

IF 6.8 2区工程技术

Case Studies in Thermal Engineering Pub Date : 2024-11-16 DOI: 10.1016/j.csite.2024.105499

Miqdam T. Chaichan, Hussain A. Kazem, Hussain Saad Abd, Ali H.A. Al-Waeli, K. Sopain

引用次数: 0

Artificial neural networks-based multi-objective optimization of immersion cooling battery thermal management system using Hammersley sampling method 基于人工神经网络的浸入式冷却电池热管理系统多目标优化（使用哈默斯利采样法

IF 6.8 2区工程技术

Case Studies in Thermal Engineering Pub Date : 2024-11-16 DOI: 10.1016/j.csite.2024.105509

Muhammed Donmez, Mehmet Ihsan Karamangil

{"title":"Artificial neural networks-based multi-objective optimization of immersion cooling battery thermal management system using Hammersley sampling method","authors":"Muhammed Donmez, Mehmet Ihsan Karamangil","doi":"10.1016/j.csite.2024.105509","DOIUrl":"https://doi.org/10.1016/j.csite.2024.105509","url":null,"abstract":"This research optimizes lithium-ion battery module cooling through immersion cooling, addressing pressure drop and after discharge average cell temperature. Using the Hammersley method, various module designs are generated. Multi-objective optimization, using ANN-based multi objective genetic algorithms, is conducted on a 16S1P configuration at 4C discharge and 0.008 kg/s. The optimized design achieved an 83 % average cell temperature reduction at a 4C discharge rate and 0.008 kg/s compared to an uncooled battery cell, while also reducing the pressure drop by 88.6 % relative to the base design. The pressure drop is approximately 12 Pa at a mass flow rate of 0.02 kg/s, with an average cell temperature of 3.13°C in the optimized design. This represents a 68.4 % reduction in pressure drop compared to the base design, which experiences approximately 40 Pa at a lower mass flow rate of 0.008 kg/s. Additionally, the optimized design achieves a 20.8 % reduction in average cell temperature, lowering it from 3.95°C in the base design to 3.13°C. These findings highlight improved pressure and thermal performance in lithium-ion battery modules, with implications for enhanced design and operation. Future work could extend these optimizations to various battery chemistries and conditions.","PeriodicalId":9658,"journal":{"name":"Case Studies in Thermal Engineering","volume":"16 1","pages":""},"PeriodicalIF":6.8,"publicationDate":"2024-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142679205","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A molecular dynamic study of the boiling heat transfer on a liquid metal surface with different thicknesses 不同厚度液态金属表面沸腾传热的分子动力学研究

IF 6.8 2区工程技术

Case Studies in Thermal Engineering Pub Date : 2024-11-16 DOI: 10.1016/j.csite.2024.105505

Zhiming Xu, Hongtao Feng, Yuting Jia, Jingtao Wang

{"title":"A molecular dynamic study of the boiling heat transfer on a liquid metal surface with different thicknesses","authors":"Zhiming Xu, Hongtao Feng, Yuting Jia, Jingtao Wang","doi":"10.1016/j.csite.2024.105505","DOIUrl":"https://doi.org/10.1016/j.csite.2024.105505","url":null,"abstract":"The impact of the thickness on the boiling phenomena of the water film on the liquid metal surface is compared, and various mechanisms are analyzed, using a molecular dynamics simulation. The findings demonstrated that the best heat transfer performance between the liquid metal surface and water film is obtained when employing a thickness of 9.56 Å, along with a shorter boiling time. Additionally, the boiling time on each surface was further accurately characterized by considering and examining the water film motion and the temperature distribution, in addition to comparing the kinetic energy and potential energy of the system. Also, the surface thickness affected the fluctuation of the liquid metal, the interfacial thermal conductance, and the interfacial thermal resistance. The thicker the liquid metal, the greater the fluctuation. However, a liquid metal surface with a thickness of 9.56 Å is characterized by a larger average interfacial thermal conductance, a smaller average interfacial thermal resistance. Based on the analysis, the difference in boiling time among the different cases was due to the combined effect of fluctuation, interfacial thermal conductance, and interfacial thermal resistance. The results enlighten new ideas and methods for augmenting the efficiency of boiling heat transfer.","PeriodicalId":9658,"journal":{"name":"Case Studies in Thermal Engineering","volume":"19 1","pages":""},"PeriodicalIF":6.8,"publicationDate":"2024-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142679207","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0