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Studies of heat and mass transfer from a rotating disk with and without an imposed axial flow

机译：研究在有和没有施加轴向流的情况下从转盘传热和传质

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摘要

Studies of heat and mass transfer from the surface of a rotating disk with and without an axial flow towards it have been carried out using two non-contact measurement techniques; namely, the transient heating thermochromic liquid crystal technique and the infra-red reflection technique, to detect the rate of evaporation of alcohol. A large scale experimental test facility was successfully designed, constructed and commissioned for this purpose. The influence of the axial flow of air towards the disk on heat and mass transfer from it has been fully investigated over a range of experimental conditions of axial flow and rotation (0 S m/s < 6.3 and 0 < rpm < 1275). This was found to increase heat transfer or mass transfer by up to 120% in the laminar region but only up to about 20% in the turbulent region. Good agreement between experimental results from the two measurement techniques was obtained. This demonstrates their usefulness in the measurement of heat and mass transfer from rotating systems. The investigation has yielded new results for the little studied case of a rotating disk with transverse flow. The following simple correlation equation has been produced for heat transfer under laminar flow conditions, for the general case of axial flow plus rotation. For the particular case of a stationary disk with imposed axial flow the results have been correlated by the equation. These equations describe the entire body of experimental results with good accuracy from the heat transfer study using the liquid crystal technique. They are also consistent with the results of the mass transfer study when those results are expressed in terms of Nusselt number using the heat transfer / mass transfer analogy.
机译：已经使用两种非接触式测量技术研究了有或没有轴向流动时从旋转盘表面向其传热和传质。即瞬态加热热致变色液晶技术和红外反射技术，以检测酒精的蒸发速率。为此目的，成功设计，建造和调试了大型实验测试设备。在一系列轴向流动和旋转的实验条件下（0 S m / s <6.3和0

著录项

  • 作者

    Al-Kahtani, Saad Ali.;

  • 作者单位

    The University of Manchester (United Kingdom).;

  • 授予单位 The University of Manchester (United Kingdom).;
  • 学科 Mechanical engineering.;Thermodynamics.;Fluid mechanics.
  • 学位 Ph.D.
  • 年度 1995
  • 页码 223 p.
  • 总页数 223
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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