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Numerical simulation of bubble collapse between two parallel walls and saturated film boiling on a sphere

机译:两平行壁之间的气泡破裂和球体上的饱和膜沸腾的数值模拟

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The present study aims at validating a computer simulation code for compressible interface flows with and without mass transfers. The numerical method was based on a dual-time fully compressible multi-phase homogeneous mixture flow model. The interfaces with a large jump in density, pressure, velocity, and temperature were captured using a compressive high-resolution interface-capturing scheme. Lee's boiling model was adopted for implementing the mass and energy transfers via interfaces. The bubble collapse between two parallel walls was first examined. The bubble profile during the collapse process was predicted and compared with experimental images. The numerical results showed good agreement. To evaluate the present model for multiphase flows, including the effects of heat and mass transfers, computations were performed for saturated film boiling on a sphere at atmospheric pressure. The evolution of the wavy liquid-vapor interface around the sphere during the film boiling process was observed. The time-averaged heat fluxes obtained from the numerical simulation were compared with those predicted from numerical data and analytical correlations. The effects of the superheated wall on heat fluxes were also investigated. (C) 2018 Elsevier Ltd. All rights reserved.
机译:本研究旨在验证具有和不具有质量传递的可压缩界面流的计算机仿真代码。数值方法基于双重时间完全可压缩的多相均质混合物流模型。使用压缩高分辨率接口捕获方案捕获密度,压力,速度和温度跃迁较大的接口。采用李的沸腾模型来实现通过界面的质量和能量传递。首先检查两个平行壁之间的气泡破裂。可以预测坍塌过程中的气泡轮廓,并将其与实验图像进行比较。数值结果吻合良好。为了评估当前模型的多相流,包括传热和传质的影响,对在大气压力下在球体上的饱和膜沸腾进行了计算。在薄膜沸腾过程中,观察到了球形液体-蒸汽界面在球形周围的演变。将通过数值模拟获得的时间平均热通量与根据数值数据和分析相关性预测的热通量进行比较。还研究了过热壁对热通量的影响。 (C)2018 Elsevier Ltd.保留所有权利。

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