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Capacity and Estimation on Liquid Spray Cooling on a Hot Surface of Just Solidified Steel Shell.

刚凝固钢壳热表面液体喷雾冷却的能力和估算。

基本信息

批准号：
01550532
负责人：
HATTA Natsuo
金额：
$ 1.66万
依托单位：
Kyoto University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1989
资助国家：
日本
起止时间：
1989 至 1990
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-01550532/
关键词：
Spray or Mist Cooling Design of Nozzle Geometry Impinging Two-Phase Jet Simulation of Two-Phase Flow Fields Heat Transfer Process Spray Film Cooling Film Boiling Mechanism 07Interaction between Liquid Particles and Solid Wall 鋼材の緩冷却流れ場の

项目摘要

We believe that the beforehand desired purpose of this research has been attained for the most part. The research basically covers a few special fields such as fluid dynamics, two-phase flow theory, heat transfer and numerical analysis, and therefore the research consists of three stages. The results obtained here are summarized as follows :First, the nozzle flow of a two-phase mixture composed of gas and water-droplets, which is commonly applied to the secondary cooling zone of continuously cast slabs, has been analyzed and it has been investigated how the phase nonequilibrium phenomena occur in the subsonic as well as supersonic nozzle flows. Also, the establishment of the condition for optimum nozzle performance has been clarified from the standpoint of nozzle geometry.Second, in order to find the theoretical heat transfer mechanism of mist cooling on a hot plate with surface temperatures in excess of the Leidenfrost point a numerical analysis of subsonic and supersonic one-phase and gas-particle two-phase jets impinging, on a flat plate normal to flow has been investigated in detail by comparing the two-phase results with the corresponding one-phase ones.Third, the interaction between an impinging water jet and a conducting flat surface at a high temperature has been analyzed focusing upon the occurrence of the film boiling. It is considered that the boiling mechanism of two-phase mixture consisting of air and water-droplets on a hot plate can be treated as being analogous to that of the impinging water jet. The study of liquid spray cooling of a highly heated surface is being in progress from on experimental and theoretical point of view. The result will be reported in neav distant future.

我们相信，这项研究的预先预期目的大部分已经达到。研究基本上涵盖了流体力学、两相流理论、传热学和数值分析等几个特殊领域，因此研究分为三个阶段。首先，对连铸板坯二冷区常见的气液两相混合物喷嘴流动进行了分析，研究了亚音速和超音速喷嘴流动中的相不平衡现象。从喷嘴几何角度阐明了最佳喷嘴性能条件的建立。其次，为了找到表面温度高于莱登弗罗斯特点的热板上雾化冷却的理论换热机理，对垂直于流动的平板上的亚音速、超音速单相和气粒两相射流进行了详细的数值分析，并将两相结果与相应的单相结果进行了比较。本文认为，由空气和水滴组成的两相混合物在热板上的沸腾机理可视为类似于冲击水射流的沸腾机理。从实验和理论两个角度对高温表面喷雾冷却的研究正在进行中。结果将在不久的将来公布。