Abstract

The influence of cooling models and moving velocity on the temperature variation and cooling rate through the thickness of a metal plate is experimentally investigated. In this investigation, the cooling process is divided into four stages: a starting stage (I), a rapid cooling stage (II), a slow cooling stage (III) and a stopping stage (IV). Based on the curves, cooling rate, temperature difference, the heat transfer coefficient and center temperature curves are discussed. The results indicate that the cooling model and moving velocity influence the heat transfer on the surface, and affects the cooling rate through the thickness by changing the temperature difference. When the flow rates of nozzles 1, 2 and 3 are set to be V₁, V₂ and V₃ respectively, the highest heat transfer is observed when V₁ > V₂ > V₃. Under this cooling model, the maximum temperature difference occurs at the time of transition from the rapid cooling stage (II) to the slow cooling stage (III). In the slow cooling stage (III), increased moving velocity improves the synchronization of the heat transfer and decreases the maximum heat flux. As well, the speed of motion affects the internal heat conduction and cooling rate by affecting surface heat transfer.

中文翻译：

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多缝射流冲击下厚板厚度传热的研究

摘要

实验研究了冷却模型和移动速度对金属板厚度范围内温度变化和冷却速率的影响。在本研究中，冷却过程分为四个阶段：开始阶段（I），快速冷却阶段（II），缓慢冷却阶段（III）和停止阶段（IV）。根据这些曲线，讨论了冷却速率，温差，传热系数和中心温度曲线。结果表明，冷却模型和运动速度会影响表面的热传递，并通过改变温度差来影响整个厚度的冷却速率。将喷嘴1、2和3的流量设置为V ₁，V ₂和V _3时当V ₁  > V ₂  > V ₃时，观察到最高的热传递。在这种冷却模型下，最大温度差发生在从快速冷却阶段（II）过渡到缓慢冷却阶段（III）的时间。在慢速冷却阶段（III），增加的移动速度改善了热传递的同步性并降低了最大热通量。同样，运动速度通过影响表面热传递而影响内部热传导和冷却速率。