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首页> 外文期刊>International Journal of Heat and Mass Transfer >An analysis of the effects of nanoparticles deposition on characteristics of the heating surface and ON pool boiling of water
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An analysis of the effects of nanoparticles deposition on characteristics of the heating surface and ON pool boiling of water

机译：纳米颗粒沉积对受热面特征和水在池中沸腾的影响分析

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摘要

Nanofluid pool boiling can modify the morphology of the heating surface and the physical properties of the base fluids, interfering directly on the vapor bubbles dynamics and on the heat transfer mechanisms. This paper concerns an experimental investigation of the effects of surface roughness and nanoparticle deposition on the contact angle, surface wettability and pool boiling heat transfer coefficient (HTC). Experiments were carried out using copper surfaces with different roughnesses, and deionized water as the working fluid at a pressure of 98 kPa and under saturated conditions. The nanostructured surfaces were produced by maghemite nanoparticle deposition, which is achieved by boiling selected mass concentrations of a Fe_2O_3-deionized water nanofluid (0.029 g/1 and 0.29 g/1, corresponding to low and high nanofluid concentration, respectively). The highest heat transfer coefficients were obtained for the smooth surface with deposition of nanoparticles at low mass concentrations. In addition, as the nanofluid concentration increases the surface roughness also increases, and the higher the nanofluid concentration, the lower the contact angle of water on the coated surface.
机译：纳米流体池沸腾可改变加热表面的形态和基础流体的物理性质，直接影响蒸气动力学和传热机理。本文涉及表面粗糙度和纳米颗粒沉积对接触角，表面润湿性和熔池沸腾热传递系数（HTC）影响的实验研究。使用具有不同粗糙度的铜表面和去离子水作为工作流体，在98 kPa的压力和饱和条件下进行了实验。通过磁赤铁矿纳米颗粒沉积产生纳米结构化表面，这是通过沸腾选定质量浓度的Fe_2O_3去离子水纳米流体（分别为0.029 g / 1和0.29 g / 1，分别对应于低和高纳米流体浓度）来实现的。对于低质量浓度的纳米颗粒沉积，获得的光滑表面具有最高的传热系数。另外，随着纳米流体浓度的增加，表面粗糙度也增加，并且纳米流体浓度越高，水在涂覆表面上的接触角越小。

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  • 作者

    I.S. Kiyomura; L.L. Manetti; A.P. da Cunha; G. Ribatski; E.M. Cardoso;

  • 作者单位

    UNESP-Univ Estadual Paulista, Department of Mechanical Engineering, Av. Brazil Centro 56, 15385-000 Ilna Solteira, SP, Brazil;

    UNESP-Univ Estadual Paulista, Department of Mechanical Engineering, Av. Brazil Centro 56, 15385-000 Ilna Solteira, SP, Brazil;

    UNESP-Univ Estadual Paulista, Department of Mechanical Engineering, Av. Brazil Centro 56, 15385-000 Ilna Solteira, SP, Brazil;

    Heat Transfer Research Group, Department of Mechanical Engineering, Escola de Engenharia de Sao Carlos (EESC), University of Sao Paulo (USP), Brazil;

    UNESP-Univ Estadual Paulista, Department of Mechanical Engineering, Av. Brazil Centro 56, 15385-000 Ilna Solteira, SP, Brazil;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Boiling heat transfer; Nanofluid; Nanostructured surface; Heat transfer coefficient;

    机译：沸腾传热;纳米流体纳米结构表面;传热系数;

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