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Analysis of the spray field development on a vertical surface during water spray-quenching using a flat spray nozzle

机译:使用扁平喷嘴的水淬火过程中垂直表面上的喷雾场发展分析

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摘要

The aims of this study were (i) to conduct experimental spatially and time-resolved measurements of flow development on a large heated surfaces during transient spray cooling operations and (ii) to investigate and discuss the influence of spray cooling mechanisms such as bubble formation and the flow field development of the cooling fluid and how this affects heat transfer. Quartz plates were heated to above 500°C and then sprayed with pressurised water subcooled to 80 K. High speed images of the quench process were collected at a rate of 3000 Hz making it possible to track the movement of the quench front as the plate cools below the Leidenfrost temperature of the fluid at that location. Observations showed that the relative importance of droplet-surface interactions decreases once the Leidenfrost temperature is reached on the plate: It was found that once the water contacts the surface, a water pool develops rapidly which grows larger as the pool floods the heated surface. Comparisons between the spatial flow development and heat transfer on the plate are made in order to describe these interactions more accurately. This information not only provides crucial input into process simulations, but is also useful to develop theoretical models of fluid-solid interaction describing the wetting of a heated component due to water spraying.
机译:这项研究的目的是(i)在瞬态喷雾冷却操作过程中对大型加热表面上的流动发展进行实验性的空间和时间分辨测量,以及(ii)研究和讨论喷雾冷却机制(如气泡形成和形成)的影响。冷却液的流场发展以及它如何影响热传递。将石英板加热到500°C以上,然后喷洒至过冷至80 K的加压水。以3000 Hz的速度收集淬火过程的高速图像,从而可以跟踪冷却时淬火前沿的运动。低于该位置的流体的莱顿弗罗斯特温度。观察表明,一旦在板上达到莱顿弗罗斯特温度,液滴与表面相互作用的相对重要性就会降低:发现一旦水接触表面,水池就会迅速发展,并随着水池淹没受热表面而变得更大。为了更准确地描述这些相互作用,对空间流动的发展和板上的传热进行了比较。该信息不仅为过程仿真提供了关键的输入,而且对于开发描述由于喷水导致的加热部件润湿的流固相互作用的理论模型也很有用。

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