Stick and oscillatory behavior of bubbles due to TiO2 nanoparticle coating in subcooled pool boiling on a wire
Stick and oscillatory behavior of bubbles due to TiO2 nanoparticle coating in subcooled pool boiling on a wire
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DOI：
10.1063/1.4986559
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发表时间：
2017-08
影响因子：
4
通讯作者：
M. Karimzadehkhouei;Arzu Özbey;K. Sefiane;A. Koşar
中科院分区：
文献类型：
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作者：
M. Karimzadehkhouei;Arzu Özbey;K. Sefiane;A. Koşar
研究发现，纳米颗粒可以改变接触角和润湿性，从而对池沸腾产生显著影响。通常，纳米流体的沸腾会导致纳米颗粒在受热面沉积。因此，很难区分在沸腾过程中是纳米颗粒包覆还是分散。本研究报告了气泡在铂丝上沸腾池中的粘滞和振荡行为，以进一步拓宽我们对这些潜在现象的理解。四种不同的情况下，即纯净的去离子水在原始电线和TiO2纳米颗粒涂层上，TiO2纳米颗粒/水纳米流体在原始电线上的质量分数分别为0.002%和0.005%，进行了测试，以揭示纳米颗粒存在时池沸腾中的气泡动力学。此外，通过对比结果和描述气泡的作用力，研究了粒子间相互作用和纳米颗粒涂层对接触角的影响。两种涂层的存在……
Nanoparticles are found to alter the contact angle and wettability characteristics, thereby inducing a significant effect on pool boiling. Generally, boiling of nanofluids results in deposition of nanoparticles on the heating surface. Therefore, it is difficult to distinguish whether nanoparticle coating or dispersion is dominating in boiling. The present study reports on sticking and oscillatory behavior of bubbles in pool boiling on a platinum wire to further broaden our understanding of these underlying phenomena. Four different cases, namely, pure deionized water on both pristine and TiO2 nanoparticle coated wires and TiO2 nanoparticle/water nanofluids at two mass fractions of 0.002% and 0.005% on pristine wire, were tested to unravel bubble dynamics in pool boiling in the presence of nanoparticles. Moreover, particle-particle interactions and nanoparticle coating effects on the contact angle were investigated by comparing the results and describing acting forces on bubbles. The presence of both coate...