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首页> 外文期刊>International Journal of Transport Phenomena >Experimental Study of Bubble Dynamics During Nucleate Pool Boiling of Nanofluids
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Experimental Study of Bubble Dynamics During Nucleate Pool Boiling of Nanofluids

机译：纳米流体核池沸腾期间泡沫动力学的实验研究

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摘要

Nanofluids are stable colloidal suspensions of nanometer sized particles suspended in traditional heat transfer fluids. During boiling of nanofluids, the dispersed nanoparticles change the surface conditions on the heated surface. A layer of nanoparticles is expected to be deposited on the surface during the boiling process which affects the boiling characteristics and the critical heat flux. The deposition of nanoparticles on the surface changes the surface contact angle as well as the bubble growth rates. In this study, nucleate pool boiling experiments have been performed using 10 nm and 30 nm sized alumina nanoparticles dispersed in water at 10~(-4) vol% and 10~(-3) vol% concentrations. A deterioration in heat transfer was observed during boiling of nanofluids. As bubbles nucleate from the copper surface, the entire bubble growth cycle has been visualized and recorded using a high-speed camera. For each concentration of nanofluid, bubble growth period, bubble equivalent, and base diameters, and the bubble contact angle have been measured. This measured data was compared with measurements obtained during pool boiling of base fluid water. The measured bubble parameters are used to evaluate the energy transferred per bubble due to microlayer evaporation.
机译：纳米流体是悬浮在传统传热流体中的纳米尺寸颗粒的稳定胶体悬浮液。在培养纳米流体期间，分散的纳米颗粒在加热表面上改变表面条件。期望一层纳米颗粒在沸腾过程中沉积在表面上，这影响沸腾特性和临界热通量。纳米颗粒在表面上的沉积改变了表面接触角以及气泡生长速率。在该研究中，已经使用10nm和30nm尺寸的氧化铝纳米颗粒在10〜（-4）体积％和10〜（-3）Vol％浓度下进行的核池沸腾实验。在纳米流体沸腾期间观察到热传递的劣化。随着气泡从铜表面成核，使用高速相机可视化和记录整个气泡生长周期。对于每种浓度的纳米流体，气泡生长时期，气泡等同物和基部直径，并且已经测量了气泡接触角。将该测量数据与基础流体水池沸腾期间获得的测量进行了比较。测量的气泡参数用于评估由于微层蒸发引起的每种气泡传递的能量。

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