Dynamic characteristics of transient boiling on a square platinum microheater under millisecond pulsed heating
Dynamic characteristics of transient boiling on a square platinum microheater under millisecond pulsed heating
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DOI：
10.1016/j.ijheatmasstransfer.2007.03.045
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发表时间：
2008
影响因子：
5.2
通讯作者：
Ji Li;G. Peterson;P. Cheng
中科院分区：
文献类型：
--
作者：
Ji Li;G. Peterson;P. Cheng
对脉冲加热条件下水的沸腾起始和气泡动力学进行了一系列实验研究，脉冲加热时间为1ms ~ 100ms。利用边长为100μm的极光滑方形铂微加热器和高速数码相机，观察并研究了沸腾起始与微加热器体温、脉冲功率电平和脉冲持续时间的关系。给定特定的脉冲持续时间，对于低脉冲功率水平，不会有气泡成核或气泡合并，对于中等脉冲功率水平，加热器上产生的单个气泡合并形成单个大气泡，而对于高脉冲功率水平，单个气泡的快速增长和随后的气泡相互作用，导致气泡合并成单个大气泡的减少，称为气泡飞溅。实验确定了气泡聚并发生的瞬态热流密度范围，以及气泡尺寸、气泡界面速度和界面加速度的时间变化规律。
A series of experimental investigations of boiling incipience and bubble dynamics of water under pulsed heating conditions for various pulse durations ranging from 1ms to 100ms were conducted. Using a very smooth square platinum microheater, 100μm on a side, and a high-speed digital camera, the boiling incipience was observed and investigated as a function of the bulk temperature of the microheater, pulse power level, and pulse duration. Given a specific pulse duration, for low pulse power levels, there would be no bubble nucleation or bubble mergence, for moderate pulse power levels, individual bubbles generated on the heater merged to form a single large bubble, while for high pulse power levels, the rapid growth of the individual bubbles and subsequent bubble interaction, resulted in a reduction in bubble coalescence into a single larger bubble, referred to as bubble splash. The transient heat flux range at which bubble coalescence occurs was identified experimentally, along with the temporal variations of bubble size, bubble interface velocity and interface acceleration.