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Bubble dynamics in nucleate pool boiling on micro-pin-finned surfaces in microgravity




作者: Yonghai Zhang, Jinjia Wei*, Yanfang Xue, Xin Kong, Jianfu Zhao
发表/完成日期: 2014-05-09
期刊名称: Applied Thermal Engineering. 2014. 70(1): 172-182.
期卷: 70(1)
相关文章:
论文简介
Bubble dynamics is an important phenomenon, which basically affects the nucleate boiling heat transfer
coefficient. Nucleate boiling heat transfer of gas-saturated FC-72 on micro-pin-finned surface was
experimentally investigated in microgravity environment by utilizing the drop tower facility in Beijing.
The dimensions of the silicon chips were 10 mm  10 mm  0.5 mm (length  width  thickness) on
which two kinds of micro-pin-fins with the dimensions of 30  30  60 mm3,50  50  120 mm3
(width  thickness  height, named PF30-60, PF50-120) were fabricated by the dry etching technique.
The experimental data were presented for the bubble departure radius on micro-pin-finned surface.
Experimental results showed that the bubble detachment radius increases with increasing heat flux, but
the traditional force balance model failed to predict the bubble detachment radius on micro-pin-finned
surfaces especially at high heat fluxes. Therefore, a new modified model for predicting bubble departure
radius on micro-pin-finned surface in microgravity was developed. In this model, both bubble force
balance and bubble coalescence are considered as two main factors influencing the size of bubble de-
parture radius, and the predictions agree much better with the experimental data at moderate and high
heat fluxes than the force balance model.
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