V槽的偏斜度及其分布对微通道流动沸腾特性的影响

王迎慧; 张兴; 龚莹; 王耀

doi:10.3969/j.issn.1671-7775.2024.04.013

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江苏大学学报（自然科学版） ›› 2024, Vol. 45 ›› Issue (4) : 464-469. DOI: 10.3969/j.issn.1671-7775.2024.04.013

能源与动力工程

V槽的偏斜度及其分布对微通道流动沸腾特性的影响

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Effects of V-cavity asymmetry and distribution on flow boiling characteristics in microchannel

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摘要

运用VOF模型与用户自定义函数，数值模拟水在V槽微通道内的流动沸腾过程，分析V槽的偏斜度及其分布对通道内气泡的生长、脱离及气液两相流流型变化的影响.研究结果表明：V槽偏斜度会影响微气泡的脱离直径和脱离时间；偏斜度为1.0的V槽对应的气泡脱离直径较偏斜度为0和0.5的V槽分别减小0.063、0.025 mm，脱离时间分别缩短5.20、2.40 ms，气液两相流由泡状流向受限气泡流的转变沿流动方向往后推移2.7 mm，且片段环状流占据区间有所减小；对于偏斜度为1.0的V槽，当其沿流动方向的分布不同时，微通道内气液两相流动呈现不同特征，前疏后密的V槽分布能更好地抑制通道内气泡聚并，通道全程未见片段环状流发生，近壁区液膜可以避免受热面局部干涸，提升微通道流动沸腾换热的稳定性和可靠性.

Abstract

VOF model and user-defined function were applied to simulate the flow boiling process of water in microchannel with V-cavities. The effects of V-cavity asymmetry (ε) and distribution on the bubble growth and detachment and the transition of gas-liquid two-phase flow in microchannel were analyzed. The results show that the magnitude of the V-cavity asymmetry can change the bubble detachment diameter and detachment time. The bubble detachment diameter of the V-cavity with asymmetry ε of 1.0 is 0.063 mm and 0.025 mm smaller than that of the V-cavity with ε of 0 and ε of 0.5, and the bubble detachment time is shortened by 5.20 ms and 2.40 ms, respectively. The transition of gas-liquid two-phase flow from bubbly flow to confined bubble flow is 2.7 mm backward along the flow direction, and the occupied area of the segment annular flow in microchannel is reduced slightly. When the V-cavity with ε of 1.0 has different distribution along the flow direction, the gas-liquid two-phase flow in microchannel presents different characteristics. The V-cavity with increasingly dense distribution can better inhibit the coalescence of bubbles in microchannel without segment annular flow, which can ensure the existence of liquid film near the wall to avoid the local drying for improving the stability and reliability of flow boiling heat transfer in microchannel.

导出引用

王迎慧, 张兴, 龚莹, 等. V槽的偏斜度及其分布对微通道流动沸腾特性的影响[J]. 江苏大学学报（自然科学版）, 2024, 45(4): 464-469 https://doi.org/10.3969/j.issn.1671-7775.2024.04.013

WANG Yinghui, ZHANG Xing, GONG Ying, et al. Effects of V-cavity asymmetry and distribution on flow boiling characteristics in microchannel[J]. Journal of Jiangsu University(Natural Science Edition), 2024, 45(4): 464-469 https://doi.org/10.3969/j.issn.1671-7775.2024.04.013

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