Mechanisms of micro liquid film heat transfer during flow boiling in non-circular microchannels part I: Measurement and theoretical model of transient film thickness

被引：0

作者：

Zhu, Jiamin ^{[1
]}

Zhang, Peng ^{[2
]}

Tan, Sicong ^{[1
]}

Wang, Tao ^{[3
]}

Guo, Chaohong ^{[2
]}

Jiang, Yuyan ^{[1
]}

机构：

[1] Beijing Inst Technol, Sch Mech Engn, Beijing 100081, Peoples R China

[2] Chinese Acad Sci, Inst Engn Thermophys, Beijing 100190, Peoples R China

[3] Beijing Univ Chem Technol, Coll Mech & Elect Engn, Beijing 100029, Peoples R China

来源：

INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER | 2024年 / 235卷

关键词：

Liquid film thickness; Non-circular microchannel; Flow boiling; Theoretical model; STEADY PROPAGATION; LONG BUBBLES; SLUG FLOW; EVAPORATION; CHANNEL; MOTION; SINGLE; TUBE;

D O I：

10.1016/j.ijheatmasstransfer.2024.126198

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

Liquid film thickness is a dominant feature for understanding boiling heat transfer mechanism in microscale slug flow. Flow boiling in circular microchannels has been extensively studied. Microchannels with non-circular cross-section are more common in industrial applications, but there have been few studies on such complex cross-sections. In the present study, the transient liquid film thickness during flow boiling in non-circular microchannels was experimentally investigated by a laser confocal displacement meter. Non-circular tubes with inner dimension of 0.39 x 0.39, 0.5 x 0.5, 0.6 x 0.6, 0.7 x 0.7 and 0.3 x 0.8 mm2 2 were used for the test section, and water and ethanol were used as working fluids. The variation of liquid film thickness under adiabatic condition in non-circular microchannels was analyzed and an empirical correlation was proposed for predicting initial liquid film thickness. On this basis, a new theoretical model for liquid film thickness variation under flow boiling in non-circular microchannels was developed, considering the effects of evaporation, shear force and transversal flow.

引用

页数：17