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首页> 外文期刊>International Journal of Heat and Mass Transfer >Effects of nanoparticles' wettability on vapor bubble coalescence in saturated pool boiling of nanofluids: A lattice Boltzmann simulation
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Effects of nanoparticles' wettability on vapor bubble coalescence in saturated pool boiling of nanofluids: A lattice Boltzmann simulation

机译：纳米粒子润湿性对纳米流体饱和池沸腾中蒸气泡结合的影响：晶格Boltzmann模拟

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摘要

Vapor bubble coalescence in saturated pool boiling of nanofluids containing moderately hydrophilic nanoparticles (θ = 33° ～ 51°) is investigated numerically by a single component multiphase particle suspension lattice Boltzmann model. It is shown that the vapor bubble coalescence time in a nanofluid is prolonged by the presence of moderately hydrophilic nanoparticles adsorbed at vapor bubble interfaces comparing with those in a base fluid. The prolonged bubble coalescence time is owing to the following three reasons: (ⅰ) the adsorbed nanoparticles deform the liquid film interface between two closely adjacent bubbles, resulting in a capillary pressure in the liquid film which resists the liquid drainage pressure (P_(gas bubble)-P_(liquid film)). (ⅱ) The nanoparticles, confined in the liquid film between the closely adjacent bubbles, block the passage for liquid drainage between the two vapor bubbles, and (ⅲ) the rigidity of vapor bubble interfaces is strengthened by the adsorbed nanoparticles at bubble interfaces. The prolonged bubble coalescence time is more effective for more hydrophilic nanoparticles with contact angle in the range of 8 = 33° ～ 51°. Since the prolonged bubble coalescence time would lead to smaller bubble size, the bubble size in pool boiling of a nanofluid with moderately hydrophilic nanoparticles is smaller than those in a base fluid, which is in agreement with results of our previous pool boiling experiments of a nanofluid.
机译：通过单个组分多相颗粒悬浮格子Boltzmann模型数量地研究含有中等亲水纳米颗粒（θ= 33°〜51°）的饱和池中饱和池中的饱和池沸点中的蒸气泡聚氨基。结果表明，纳米流体中的蒸汽气泡聚结时间延长了与基础流体中的蒸汽泡织物吸附的中间亲水性纳米颗粒。由于以下三种原因，延长的气泡聚结时间：（Ⅰ）吸附的纳米颗粒在两个紧密相邻的气泡之间变形液体膜界面，导致液体膜中的毛细管压力，抵抗液体排水压力（P_（气泡（气泡） ）-P_（液体膜））。 （Ⅱ）纳米颗粒，在紧密相邻的气泡之间限制在液体膜中，阻断了两个蒸汽气泡之间的液体排水通道，和（Ⅲ）通过吸附的纳米颗粒在泡泡界面的吸附纳米颗粒加强蒸汽泡织物的刚性。延长的气泡聚结时间对于具有8 = 33°〜51°的接触角的更多亲水纳米颗粒更有效。由于延长的气泡聚结时间会导致较小的气泡尺寸，因此纳米流体的池沸腾的气泡尺寸小于基础流体中的纳米流体的泡沫尺寸，这与我们以前的池流域的池沸腾实验的结果一致。

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