The Proceedings of the Thermal Engineering Conference
Online ISSN : 2424-290X
2018
Session ID : 0200
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Effect of Distribution of the Artificial Cavities on the Departure Frequency of the Bubble on Boiling Surface and Heat Transfer
*Kan KUWAKADOTatsuya TSUNEYOSHITakahiro ITOYoshiyuki TSUJI
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Abstract

Bubbles in the boiling on a solid surface is generally generated from the nucleation gas bubble in a small cavity, which is inevitable on the manufactured surface. Increase in the number density of the cavity results in an increased density of the bubble nucleation, leading to a higher heat transfer coefficient. In this study the interactions between neighboring bubbles are investigated in order to clarify its effect on the departure frequency of the bubbles in the pool boiling on the horizontal surface. From the visualization, the liquid flow induced behind the departing bubble should enhance of the departure of the neighboring bubble. The vertical vibration of the bubble also correlated with the departure of the neighboring bubble. The downward motion of the bubble is related with upward motion, that is, the departure of the neighboring bubble.

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© 2018 The Japan Society of Mechanical Engineers
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