微管长度对对流沸腾影响的数值研究

IF 1.5 4区 工程技术 Q3 MECHANICS
Hua-Yi Hsu, Yu-Chen Lin, Zong-You Chen, Ying Wang, Cheng-En Li, Shong-Han Pai, Chia-Wei Lin
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引用次数: 0

摘要

微管长度对对流沸腾过程及其传热特性影响显著。除了高传热,低压降也希望提高抽水系统的能源效率。本文采用流体体积法数值研究了微管长度对对流沸腾传热和压降的影响。给出了不同微管长度L = 2 ~ 20 mm时的蒸汽形成、换热系数和压降的模拟结果。沸腾发生在距离质量通量入口约2mm的地方。过冷沸腾状态可观察到2和10毫米之间。在较长的微管(L = 15 mm和20 mm)中显示了三种不同的状态,即液体单相流、气泡流和塞流。研究发现,微管越短,气泡形成越少,传热越好,压降越小。在2 mm长的微管内,平均换热系数可达到2432 W/(m2K),准稳态总压降Δp|总计32.8 Pa。这项工作提供了微管长度对对流沸腾的影响的详细研究,以及相关的物理见解。它可以作为未来微尺度传热应用设计的一个指标。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A numerical investigation of microtube length effect on convective boiling
Abstract The microtube length significantly influences the convective boiling process and associated heat transfer characteristics. Other than high heat transfer, low pressure drop is also desired to improve the energy efficiency of the pumping system. This work numerically investigates the microtube length effect on heat transfer and pressure drops of convective boiling with the volume of fluid (VOF) method. The simulation results of vapor formation, heat transfer coefficient, and pressure drop are shown with different microtube lengths L = 2–20 mm. The onset of boiling is around 2 mm away from the mass flux inlet. The subcooled boiling regime can be observed between 2 and 10 mm. Three distinct regimes, liquid single-phase flow, bubbly flow, and plug flow, are shown in the longer microtubes (L = 15 mm and 20 mm). It is found that shorter microtubes can lead to less bubble formation with higher heat transfer and lower pressure drop. The average heat transfer coefficient can achieve 2432 W/(m2K) with a lower quasi-steady total pressure drop Δp|total of 32.8 Pa inside a 2-mm-long microtube. This work offers a detailed study of the impact of microtube length on convective boiling, along with pertinent physical insights. It may serve as an indicator for future microscale heat transfer application designs.
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来源期刊
Journal of Mechanics
Journal of Mechanics 物理-力学
CiteScore
3.20
自引率
11.80%
发文量
20
审稿时长
6 months
期刊介绍: The objective of the Journal of Mechanics is to provide an international forum to foster exchange of ideas among mechanics communities in different parts of world. The Journal of Mechanics publishes original research in all fields of theoretical and applied mechanics. The Journal especially welcomes papers that are related to recent technological advances. The contributions, which may be analytical, experimental or numerical, should be of significance to the progress of mechanics. Papers which are merely illustrations of established principles and procedures will generally not be accepted. Reports that are of technical interest are published as short articles. Review articles are published only by invitation.
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