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首页> 外文会议>American Society of Mechanical Engineers(ASME) Summer Heat Transfer Conference(HT2005) vol.2; 20050717-22; San Francisco,CA(UA) >COMPARISON OF HEAT TRANSFER RATES AROUND MOVING AND STATIONARY BUBBLES DURING NUCLEATE BOILING
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COMPARISON OF HEAT TRANSFER RATES AROUND MOVING AND STATIONARY BUBBLES DURING NUCLEATE BOILING

机译：核沸腾过程中运动和静止气泡周围传热速率的比较

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摘要

Nucleate boiling is known to be a very efficient method for generating high heat transfer rates from solid surfaces into liquids; however, the fundamental physical mechanisms governing nucleate boiling heat transfer are not well understood. This paper describes a numerical analysis of the heat transfer mechanisms around stationary and moving bubbles on a very thin microwire. The numerical analysis accurately models the experimentally observed bubble movement and fluid velocities. The analytical model was then used to study the heat transfer mechanisms around the bubbles. The analysis shows that the primary heat transfer mechanism is not the direct heat transfer to the bubble, but rather the large amount of convection around the outside of the bubble induced by the Marangoni flow that transfers at least twice as much energy from the wire than the heat transfer directly under the bubble. The enhanced heat transfer due to the Marangoni flow was evident for both stationary and moving bubbles.
机译：已知核沸腾是从固体表面到液体的高传热速率的非常有效的方法。然而，控制成核沸腾传热的基本物理机理还没有被很好地理解。本文描述了非常细的微线上围绕静止和运动气泡的传热机理的数值分析。数值分析准确地模拟了实验观察到的气泡运动和流体速度。然后使用分析模型研究气泡周围的传热机理。分析表明，主要的传热机理不是直接传给气泡，而是由Marangoni流引起的围绕气泡外部的大量对流，该对流传递的能量至少是导线的能量的两倍。气泡正下方传热。对于固定气泡和移动气泡，由于Marangoni流动而导致的传热增强是显而易见的。

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