化工进展2023，Vol.42Issue(11)：5592-5601,10.DOI:10.16085/j.issn.1000-6613.2022-2246
不同结构凹穴微通道内超临界氮气流动与传热特性
Flow and heat transfer characteristics of supercritical nitrogen in micro-channel with different cavity structures
摘要
Abstract
In order to realize the efficient design of the surface structure of the micro-channel heat exchanger,the effects of cavity shapes(straight micro-channel,circular,rectangular and trapezoidal)and ovality on the flow and heat transfer performance of micro-channel were studied by means of numerical simulation and experiment,using supercritical nitrogen as the fluid medium,the mechanism of fluid efficient and low resistance heat transfer enhancement was revealed.The results showed that compared with the straight micro-channel,the entrance distance required for the SCN2 velocity on the axis of the circular cavity micro-channel to reach a stable value was shorter,which was due to the fact that the cavity can promote the fluid flow/thermal boundary layer to be in the alternate state of destruction and reconstruction all the time.The shape of the fluid vortex in the circular cavity was consistent with the cavity geometry,and its flow resistance and heat transfer performance were optimal,followed by trapezoidal cavity micro-channel and rectangular cavity micro-channel.With the increase of ovality,the overall performance of cavity micro-channel increased firstly and then decreased.When the ovality was 1,the overall performance was optimal.The research results in this paper are of great significance for improving the design and manufacturing capability of micro-channel heat exchangers.关键词
微通道/超临界氮气/凹穴/结构/流动与传热Key words
micro-channel/supercritical nitrogen/cavity/structure/flow and heat transfer分类
石油、天然气工程引用本文复制引用
韩昌亮,黄峄演,徐建全..不同结构凹穴微通道内超临界氮气流动与传热特性[J].化工进展,2023,42(11):5592-5601,10.基金项目
国家自然科学基金(22108050) （22108050）
黑龙江省"百千万"重大科技专项(2020ZX10A0038). （2020ZX10A0038）
