Flow boiling heat transfer and associated bubble behaviors over backward- and forward-facing steps

Yuan Bo; Zhang Yonghai; Liu Lei; Wei Jinjia

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Flow boiling heat transfer and associated bubble behaviors over backward- and forward-facing steps

机译：在落后和前后台阶上流动沸腾传热和相关的泡沫行为

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摘要

The influence of backward-facing step and forward-facing step on flow boiling heat transfer performance was experimentally studied. The experiments were carried out with expansion ratio of 2, 2.5 and 3, and channel Reynolds number of 3048 to 6097. The heated surface was immobilized at the downstream next to the step. FC72 was used as the working fluid with the inlet subcooling of 35 K. The bubble behaviors were analyzed by the high-speed camera. The results reveal that the backward-facing step geometry has a negative effect on the heat transfer performance compared with the flat channel. The effect of forward-facing step geometry is related with the dimension of the recirculation regions: the heat transfer performance is enhanced if the reattachment point falls on the heated surface, and is deteriorated if the recirculation region is larger than the length of the heated surface. The bubble behaviors were analyzed to illustrate the dimension of the recirculation region and the mechanism of flow boiling heat transfer over a step.

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来源
《Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics》 |2021年第1期|共12页
作者
Yuan Bo; Zhang Yonghai; Liu Lei; Wei Jinjia;
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作者单位

Xi An Jiao Tong Univ Sch Chem Engn &

Technol Xian 710049 Peoples R China;

Xi An Jiao Tong Univ Sch Chem Engn &

Technol Xian 710049 Peoples R China;

Xi An Jiao Tong Univ Sch Chem Engn &

Technol Xian 710049 Peoples R China;

Xi An Jiao Tong Univ Sch Chem Engn &

Technol Xian 710049 Peoples R China;

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原文格式 PDF
正文语种 eng
中图分类流体力学;
关键词
Flow boiling; Backward-facing step; Forward-facing step; Bubble behaviors;

机译：流沸腾;面对后的步骤;面向前瞻性步骤;泡沫行为;

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Flow boiling heat transfer and associated bubble behaviors over backward- and forward-facing steps

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