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Development and analysis of sulfur based McGill heat pipe.

机译：硫基麦吉尔热管的开发与分析。

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摘要

The development of a mid-temperature range (250°C--500°C) heat pipe for high heat flux applications has been the focus of numerous researchers during the last 40 years. However, until this work a viable working substance for the heat pipe has eluded researchers. While the most mentioned element has been sulfur, its unusual viscosity-temperature relationship has prevented the commercialization of a sulfur-based heat pipe.;The recent development (and patenting) of the McGill heat pipe revived the question of whether sulfur would be viable in such a unit. Extensive testing showed that it is possible to make a high heat flux heat pipe with sulfur as the working substance. Given the lack of scientific details about the McGill heat pipe, a focused research program was undertaken to quantify the operation of the McGill heat pipe prior to studying the sulfur based unit.;One study looked at the two-phase flow characteristics of the McGill heat pipe. Both qualitative (videos) and quantitative data like the pressure drop and returning velocity were measured as a function of gas flow rate. Moreover, a new non-dimensional parameter, the modified swirler number was proposed. Further, the Lockhart-Martinelli method was used to analyze the pressure drop.;In the McGill heat pipe, the centrifugal force that is produced by the vortexing flow pushes liquid up against the walls and increases the critical heat flux. A theoretical model consisting of 4 sub-models was developed to predict the critical heat flux for defined situations.;The development of the sulfur-based heat pipe followed the empirical and mathematical modeling work that was carried out. A McGill heat pipe with sulfur as the working substance was designed, built and tested. The design was arrived at by considering the modeling work that was originally carried out. A number of interesting features were discovered with the sulfur-based heat pipe. A model based on mass, energy, and flow balances between the condenser and the evaporator was also developed. The model can be used to calculate the void fraction, quality, wall temperature, local heat flux distribution, heat load, cooling flow rate, and working substance temperature. The experimental results fit well the calculated ones.
机译：在过去40年中，为高热通量应用开发中温范围（250°C--500°C）热管一直是众多研究人员关注的焦点。然而，直到这项工作，热管的可行的工作物质还没有被研究人员所接受。尽管最受关注的元素是硫，但其异常的粘度-温度关系阻止了硫基热管的商业化。;麦吉尔热管的最新开发（并申请了专利）使人们重新思考了硫是否在工业中可行。这样的单位。广泛的测试表明，以硫为工作物质可以制造高热通量的热管。由于缺乏有关McGill热管的科学细节，在研究硫基装置之前，进行了一项重点研究计划以量化McGill热管的运行。;一项研究着眼于McGill热管的两相流动特性。管。定性（视频）和定量数据（如压降和返回速度）均作为气体流速的函数进行测量。此外，提出了一个新的无量纲参数，即修改后的旋流数。此外，使用洛克哈特-马丁尼方法（Lockhart-Martinelli method）分析压降。在麦吉尔热管中，涡流产生的离心力将液体推向壁，并增加了临界热通量。建立了一个由4个子模型组成的理论模型来预测特定情况下的临界热通量。;硫基热管的开发遵循了进行的经验和数学建模工作。设计，制造和测试了以硫为工作物质的麦吉尔热管。设计是通过考虑最初执行的建模工作得出的。硫基热管发现了许多有趣的功能。还建立了一个基于质量，能量和冷凝器与蒸发器之间流量平衡的模型。该模型可用于计算空隙率，质量，壁温，局部热通量分布，热负荷，冷却流量和工作物质温度。实验结果很好地拟合了计算结果。

著录项

  • 作者

    Zhao, Hujun.;

  • 作者单位

    McGill University (Canada).;

  • 授予单位 McGill University (Canada).;
  • 学科 Engineering Metallurgy.
  • 学位 Ph.D.
  • 年度 2007
  • 页码 137 p.
  • 总页数 137
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 冶金工业;
  • 关键词

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