摘要：The development of flexible electronic devices has put forward the demand for microchannel heat exchangers made of elastically deformable materials. The condensation flow of FC-72 in rectangular microchannels made of PDMS with deformable soft wall was studied. The microchannels have a width of 300 μm and a height of 150 μm. Flow mass fluxes of 290 and 482 kg/(m2 ? s) and vapor mass quality varying from 0.1 to 0.9 were experimentally studied. The images of the condensation flow patterns were collected using a fast camera. The data on soft wall deformation was measured using a white light confocal displacement sensor. The wall thickness increasing appears for intermittent flow. This wall thickening gets more significant with increasing inlet vapor mass quality and mass flux. By analyzing the curvature of the liquid-vapor interface, it is found that surface tension is not sufficient to cause the wall deformation observed in the experiments. This soft wall thickening phenomenon is caused by the local pressure drop in the liquid slug. This pressure drop occurs as a result of shrinking elongated bubbles due to the vapor vanishing during the condensation process. Therefore, if condensation is strong enough, it may induce a sudden local pressure drop in the liquid slug, causing the soft wall to move towards the channel inside. A theoretical model is proposed to predict the deformation of this soft wall. The results of the model are in good agreement with the measured deformation data for higher mass flux. ? 2025, Materials China. All rights reserved.

ISSN号：0438-1157

卷、期、页：卷76期10页5076-5092

发表日期：2025-10-25

期刊分区（SCI为中科院分区）：无

收录情况：EI（工程索引）

发表期刊名称：Huagong Xuebao/CIESC Journal

通讯作者：刘子琦,俞海

第一作者：王吉,张宇宁

论文类型：期刊论文

论文概要：刘子琦,王吉,俞海,张宇宁，Condensation flow in PDMS microchannels with detectable wall deformation caused by flow condensation，Huagong Xuebao/CIESC Journal，2025，卷76期10页5076-5092

论文题目：Condensation flow in PDMS microchannels with detectable wall deformation caused by flow condensation