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首页> 外文期刊>International Journal of Heat and Mass Transfer >Effect of nanofluid formation methods on behaviors of boiling bubbles
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Effect of nanofluid formation methods on behaviors of boiling bubbles

机译：纳米流体形成方法对沸腾行为的影响

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Understanding the boiling heat transfer characteristics of nanofluid suspensions containing nanoparticles is one of the challenging issues in the heat transfer research field. The addition of nanoparticles modifies both the surface characteristics and the thermo-physical properties of the suspension, including thermal conductivity, viscosity, and surface tensions. One of the critical features is the stability of nanoparticle suspension, which is strongly related to the formulation method of nanofluids. In this study, to investigate the effect of several formation methods, the pool-boiling bubble behaviors of Al2O3 nanofluid, with varying nanofluid formation methods, were systematically analyzed using an X-ray imaging system. The changes in the wettability of Al2O3 nanofluid suspensions and the variations of boiling bubble characteristics were analyzed to determine the relationship between boiling-bubble behaviors and examine the effects of heating the substrate. Before the heating substrate, the bubble generating ratio was increased by 1.4 times, when the concentration of Nanofluid 3 increased from 0.05 wt% to 1 wt% with adopting the electrostatic stabilization method and high-speed rotating procedure. On the other hand, at the end of heating process, the bubble generating ratio was decreased by 0.78 times for the same concentration change. Once the nanoparticle sedimentation occurred, the trend of wettability and bubble behaviors of nanofluids changed based on the surface modification, regardless of the nanofluid formation method. An increase in the Al2O3 nanofluid concentration results in a deterioration of the heat transfer characteristics, and the formulation method is not related to the boiling heat transfer performance when nanoparticles are deposited. (C) 2019 Elsevier Ltd. All rights reserved.
机译：理解包含纳米颗粒的纳米流体悬浮液的沸腾传热特性是传热研究领域中具有挑战性的问题之一。纳米颗粒的添加改变了悬浮液的表面特性和热物理性质，包括热导率，粘度和表面张力。关键特征之一是纳米颗粒悬浮液的稳定性，这与纳米流体的配制方法密切相关。在这项研究中，为了研究几种形成方法的效果，使用X射线成像系统系统分析了Al2O3纳米流体在不同的纳米流体形成方法下的池沸腾气泡行为。分析了Al2O3纳米流体悬浮液的润湿性变化和沸腾特性的变化，以确定沸腾行为之间的关系，并研究了加热基材的效果。在加热基板之前，通过采用静电稳定方法和高速旋转程序，当纳米流体3的浓度从0.05 wt％增加到1 wt％时，气泡产生率增加了1.4倍。另一方面，在加热过程结束时，对于相同的浓度变化，气泡产生率降低了0.78倍。一旦发生纳米颗粒沉降，则不管纳米流体的形成方法如何，纳米流体的润湿性和气泡行为的趋势都基于表面改性而改变。 Al 2 O 3纳米流体浓度的增加导致传热特性的劣化，并且当沉积纳米颗粒时，该配制方法与沸腾传热性能无关。 （C）2019 Elsevier Ltd.保留所有权利。

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