摘要：Condensation flow of FC-72 in a rectangular microchannel made of polydimethylsiloxane with soft wall deformation was studied. The microchannel has a rectangular cross-sectional shape with hydraulic diameters of 0.222, 0.240, and 0.286 mm. Mass fluxes of 150-380 kg/(m(2).s) and vapor mass qualities of 0.2-0.6 were experimentally tested. The images of the two-phase flow pattern were captured using a high-speed camera. The deformation of the elastic channel＇s upper wall was measured using a white light confocal coaxial displacement sensor. The upper wall deformation, represented by an increase in thickness, occurred during intermittent flow. The maximum variation in the upper wall thickness of the channel is up to 25% of the original wall thickness, which was increased with increasing inlet vapor mass quality and mass flux. Surprisingly, the channel wall tended to thicken when sequential bubbles flow through. This phenomenon came from the local fluid pressure decrease caused by condensation, which was strong enough to make the bubble shrink rapidly. This shrinking may leave a temporary vacuum in the liquid slug connecting two adjacent bubbles. In channels with soft wall, the vacuum pulls the flexible wall moving toward the inside of the channel, resulting in wall thickening observed in the experiments. Therefore, this wall deformation is caused by condensation. A theoretical model based on phase change flow and elasticity equations was proposed, whose results agreed well with the experimentally measured deformation. The outcomes can serve as a heat dissipation solution for flexible devices in high-tech fields such as medical and aerospace applications.

ISSN号：1070-6631

卷、期、页：卷: 37期: 11

发表日期：2025-11-01

期刊分区（SCI为中科院分区）：二区

收录情况：SCI（科学引文索引印刷版）,EI（工程索引）,SCIE（科学引文索引网络版）

发表期刊名称：PHYSICS OF FLUIDS

参与作者：于峰

通讯作者：刘子琦

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,于峰,张宇宁，Condensation flow in a flexible rectangular polydimethylsiloxane microchannel with elastic wall deformation caused by phase change，PHYSICS OF FLUIDS，2025，卷: 37期: 11

论文题目：Condensation flow in a flexible rectangular polydimethylsiloxane microchannel with elastic wall deformation caused by phase change