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A particulate-flow heat exchanger inspired by gas diffusion in lung capillaries.

机译：微粒流热交换器受气体在肺毛细血管中扩散的启发。

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摘要

In this study, a new cooling concept using encapsulated phase-change particles flowing with water in a parallel-plate mini-channel is presented. This novel concept is inspired by the gas exchange process in alveolar capillaries, where red blood cells (RBCs) flow with blood plasma, yielding very high gas transfer efficiency. Another important characteristic of alveolar capillary blood flow, which is related to the high efficiency of the lungs, is the snug fitting of the RBCs into the capillaries. Hence, preliminary results of experimental tests using particles with diameter similar to the flow channel spacing flowing with water through a heated parallel-plate channel test module are presented and analyzed in Chapter 3. The particles are octadecane paraffin (C18 H38), a phase-change material, encapsulated in a thin melamine shell. The temperature distribution along the heated surface of the channel is measured for various water flow rates, with and without particles, and with different numbers of particles. Results are reported in terms of the channel heated surface average temperature and the average heat transfer coefficient.;This study also considers modeling and simulation of the particulate enhanced convection in Chapter 4. The effect of flow velocity and particle concentration on the local heat transfer of the flow is also investigated. Time-dependent moving-mesh models, incorporating both melting and solidification, are utilized for simulating a single particle flow. Particulate flow using particles with phase-change material (PCM) in the cooling fluid enhances the convective energy transport by the fluid mainly in two ways: (1) by "storing energy" in latent heat form; and, (2) by "mixing" the flow field. The high energy storage density and small temperature variation during the heat transfer process provided by the encapsulated phase-change material has made the first role particularly interesting in recent years to many investigators. The objective of Chapter 5 is to determine, latent heat and of the mixing effects on the convection enhancement. To obtain the latent heat effect, the tests are repeated with ABS (Acrylonitrile-Butadiene-Styrene) plastic particles with no latent heat capacity (in the current test operating temperature range). We measured the temperature distribution along the heated surface of the channel for various heat fluxes, and velocities, with octadecane (C18H38 ) paraffin and ABS plastic particles. The results have been also compared with clear water coolant flow.
机译：在这项研究中，提出了一种新的冷却概念，即使用在平行板微型通道中与水一起流动的封装相变颗粒。这个新颖的概念受到肺泡毛细血管中气体交换过程的启发，其中红细胞（RBC）与血浆一起流动，产生了很高的气体传输效率。肺泡毛细血管血流的另一个重要特征与肺的高效率有关，是红细胞紧贴毛细血管。因此，第3章介绍并分析了使用直径与流经加热的平行板通道测试模块的流道间距相似的粒子进行的实验测试的初步结果。这些粒子为十八烷链烷烃（C18 H38），相为改变材料，封装在三聚氰胺薄壳中。对于具有和不具有颗粒以及具有不同数目的颗粒的各种水流速，测量沿着通道的加热表面的温度分布。结果以通道受热表面平均温度和平均传热系数表示。;本研究还在第4章中考虑了颗粒增强对流的建模和仿真。流速和颗粒浓度对管道局部传热的影响。还研究了流量。结合熔化和凝固的时间相关的移动网格模型被用于模拟单个粒子的流动。在冷却流体中使用带有相变材料（PCM）的颗粒的颗粒流主要通过两种方式增强了流体的对流能量传输：（1）通过以潜热形式“存储能量”； （2）通过“混合”流场。封装相变材料在传热过程中所具有的高能量存储密度和较小的温度变化，使得近几年来，许多研究者特别关注了第一个作用。第5章的目的是确定潜热以及混合对对流增强的影响。为了获得潜热效果，使用没有潜热容量的ABS（丙烯腈-丁二烯-苯乙烯）塑料颗粒（在当前测试工作温度范围内）重复测试。我们使用十八烷（C18H38）石蜡和ABS塑料颗粒，测量了沿通道加热表面各种热通量和速度的温度分布。还将结果与清水冷却剂流量进行了比较。

著录项

  • 作者

    Hassanipour, Fatemeh.;

  • 作者单位

    Southern Methodist University.;

  • 授予单位 Southern Methodist University.;
  • 学科 Engineering Mechanical.
  • 学位 Ph.D.
  • 年度 2009
  • 页码 110 p.
  • 总页数 110
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 机械、仪表工业;
  • 关键词

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