Investigation on the heat transfer characteristics of liquid film over the horizontal circular tube with reverse wind velocity

IF 6.4 2区工程技术 Q1 MECHANICS

International Communications in Heat and Mass Transfer Pub Date : 2025-10-13 DOI:10.1016/j.icheatmasstransfer.2025.109850

Huanhao Zhang, Xiuhong Ren, Kaixin Zheng, Zhanwei Wang, Lin Wang

{"title":"Investigation on the heat transfer characteristics of liquid film over the horizontal circular tube with reverse wind velocity","authors":"Huanhao Zhang, Xiuhong Ren, Kaixin Zheng, Zhanwei Wang, Lin Wang","doi":"10.1016/j.icheatmasstransfer.2025.109850","DOIUrl":null,"url":null,"abstract":"<div><div>Unsaturated falling film evaporation has numerous applications due to its high heat transfer efficiency. Heat transfer characteristics of circular tube without wind has been extensively investigated, while the heat transfer with wind velocity is rarely studied. In this study, the heat transfer characteristics of liquid film outside the circular tube is investigated by using a transient simulation model. The influence of wind velocity, liquid Reynolds number, heat flux and tube diameter are elucidated. Comparisons of simulation data and experimental value is conducted with a mean deviation of 5.6 % and 4.3 % under the condition with and without wind velocity. The results show that the local heat transfer coefficient (HTC) increase with wind velocity, and the average HTC with wind is about 5.28 %–15.83 % larger than the condition without wind. The increase of liquid Reynolds number and heat flux can effectively enhance the HTC before the critical value of 576 and 40<span><math><mspace></mspace><mi>kW</mi><mo>/</mo><mfenced><mrow><msup><mi>m</mi><mn>2</mn></msup><mo>·</mo><mi>K</mi></mrow></mfenced></math></span>. The HTC decrease with the increase of diameter, and the average HTC of 14 and 19 <span><math><mi>mm</mi></math></span> circular tube is approximately 15.72 %, 6.96 % greater than that of 25.4 <span><math><mi>mm</mi></math></span>. Furthermore, a correlation for calculating the average HTC is developed according to the simulation data with a mean difference of 4.3 %. The research results provide a theoretical support for the development and design of evaporative condenser.</div></div>","PeriodicalId":332,"journal":{"name":"International Communications in Heat and Mass Transfer","volume":"169 ","pages":"Article 109850"},"PeriodicalIF":6.4000,"publicationDate":"2025-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"International Communications in Heat and Mass Transfer","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S073519332501276X","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"MECHANICS","Score":null,"Total":0}

引用次数: 0

Abstract

Unsaturated falling film evaporation has numerous applications due to its high heat transfer efficiency. Heat transfer characteristics of circular tube without wind has been extensively investigated, while the heat transfer with wind velocity is rarely studied. In this study, the heat transfer characteristics of liquid film outside the circular tube is investigated by using a transient simulation model. The influence of wind velocity, liquid Reynolds number, heat flux and tube diameter are elucidated. Comparisons of simulation data and experimental value is conducted with a mean deviation of 5.6 % and 4.3 % under the condition with and without wind velocity. The results show that the local heat transfer coefficient (HTC) increase with wind velocity, and the average HTC with wind is about 5.28 %–15.83 % larger than the condition without wind. The increase of liquid Reynolds number and heat flux can effectively enhance the HTC before the critical value of 576 and 40

kW / (m^{2} \cdot K)

. The HTC decrease with the increase of diameter, and the average HTC of 14 and 19

mm

circular tube is approximately 15.72 %, 6.96 % greater than that of 25.4

mm

. Furthermore, a correlation for calculating the average HTC is developed according to the simulation data with a mean difference of 4.3 %. The research results provide a theoretical support for the development and design of evaporative condenser.

查看原文本刊更多论文

水平圆管内逆风速液膜传热特性研究

不饱和降膜蒸发因其较高的传热效率而得到了广泛的应用。无风条件下圆管传热特性研究较多，而有风速条件下圆管传热特性研究较少。本文采用瞬态模拟模型研究了圆管外液膜的换热特性。分析了风速、液体雷诺数、热流密度和管径等因素的影响。在有风速和无风速条件下，模拟数据与实验值的平均偏差分别为5.6%和4.3%。结果表明：局部换热系数随风速增大而增大，有风条件下的局部换热系数比无风条件下的平均高5.28% ~ 15.83%；液体雷诺数和热流密度的增加可以有效地提高临界值576和40kW/m2·K之前的HTC。随着直径的增大，HTC减小，14和19 mm圆管的平均HTC约为15.72%，比25.4 mm圆管的平均HTC大6.96%。此外，根据平均差为4.3%的仿真数据，建立了计算平均宏达电的相关性。研究结果为蒸发式冷凝器的开发和设计提供了理论支持。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

International Communications in Heat and Mass Transfer 工程技术-力学

CiteScore

11.00

自引率

10.00%

发文量

648

审稿时长

32 days

期刊介绍： International Communications in Heat and Mass Transfer serves as a world forum for the rapid dissemination of new ideas, new measurement techniques, preliminary findings of ongoing investigations, discussions, and criticisms in the field of heat and mass transfer. Two types of manuscript will be considered for publication: communications (short reports of new work or discussions of work which has already been published) and summaries (abstracts of reports, theses or manuscripts which are too long for publication in full). Together with its companion publication, International Journal of Heat and Mass Transfer, with which it shares the same Board of Editors, this journal is read by research workers and engineers throughout the world.