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首页> 外文期刊>Heat Transfer Engineering >Parametric Analysis of Enhanced Heat Transfer for Laminar Flow of Mlcroencapsulated Phase Change Suspension in a Circular Tube with Constant Wall Temperature
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Parametric Analysis of Enhanced Heat Transfer for Laminar Flow of Mlcroencapsulated Phase Change Suspension in a Circular Tube with Constant Wall Temperature

机译：恒定壁温下圆管内微胶囊相变悬浮液层流增强传热的参数分析

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摘要

A novel phase change microcapsule with compound crust is briefly introduced in this paper, and the heat transfer enhancement due to a microencapsulated phase change material is investigated parametrically for laminar convective heat transfer in a circular tube with constant wall temperature. The size of the phase change mushy region and the phase change interface locations are given for the various governing parameters. Two enhancement ratios, the traditional enhancement ratio and a modified enhancement ratio, were used to quantify the enhanced heat transfer characteristics of the microencapsulated phase change suspension for six major parameters. The six parameters are the bulk Stephan number, the volumetric concentration of the solid-phase, the particle-to-tube radius ratio, the dimensionless initial subcooling, the dimensionless phase change temperature range, and the bulk Reynolds number. The simulations show that the bulk Stephan number and the volumetric concentration are the most important parameters influencing the heat transfer enhancement of the microencapsulated suspension. The influence of the microcapsule diameters on the heat transfer enhancement comes from the microconvection, instead of the latent heat release due to the phase change. In addition, the combined effect of changes in all of these parameters on the heat transfer enhancement was examined.
机译：本文简要介绍了一种新型的具有复合壳的相变微胶囊，并针对壁温恒定的圆管中的层流对流传热进行了参数研究，研究了由于微囊化相变材料引起的传热增强。给出了各种控制参数的相变糊状区域的大小和相变界面的位置。传统的增强率和改进的增强率这两个增强率用于量化六个主要参数的微囊化相变悬浮液的增强传热特性。六个参数是本体斯蒂芬数，固相的体积浓度，颗粒与管的半径比，无量纲的初始过冷，无量纲的相变温度范围和体积雷诺数。模拟表明，本体Stephan数和体积浓度是影响微囊悬浮液传热增强的最重要参数。微胶囊直径对传热增强的影响来自微对流，而不是由于相变而释放潜热。此外，检查了所有这些参数的变化对传热增强的综合影响。

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  • 来源
    《Heat Transfer Engineering》 |2008年第1期|p.97-106|共10页
  • 作者

    ZHENNAN ZHAO; RUI HAO; YUQUAN SHI;

  • 作者单位

    Thermal Energy Engineering Department, Tianjin University, Tianjin, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 工业用热工设备;
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