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首页> 外文期刊>Physics of fluids >Saturated film boiling over a circular cylinder subjected to horizontal cross-flow in the mixed regime
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Saturated film boiling over a circular cylinder subjected to horizontal cross-flow in the mixed regime

机译：饱和膜在混合制度中经历水平交叉流动的圆柱体上沸腾

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Film boiling over a circular cylinder in a horizontal cross-flow of saturated liquid is studied in the mixed regime that is characterized by a combined influence of buoyancy and flow inertia at low magnitudes of the Froude number (Fr). Liquid-vapor interface evolution and the ensuing vapor wake dynamics together with heat transfer have been determined through a computational framework developed for phase change problems on two-dimensional unstructured grids using a coupled level set and volume of fluid interface capturing method. While the quasisteady nature of ebullition cycle is gradually lost as Fr increases, the effect of cross-flow orientation with respect to gravity is shown to be nontrivial in the mixed regime. A direct consequence of the orthogonal gravity and flow fields is an anomalous impairment of heat transfer with an increase in cross-flow velocity under certain conditions, which is discussed in detail. Simultaneously, the film boiling behavior as influenced by several other hydrodynamic and thermal parameters is also ascertained. The interplay between buoyancy and inertia is further highlighted while discussing the interdependent liquid and vapor wake characteristics in the mixed regime with horizontal cross-flow. The liquid wake behavior is shown to result not only from the bluff body geometry but also the instantaneous vapor wake profiles, with the wall superheat affecting the time scale of wake interaction. Finally, a reduction factor (xi) is proposed and determined as a function of the Froude number, which is used in conjunction with a correlation for upward cross-flow film boiling to predict the heat transfer. Published under license by AIP Publishing.
机译：在饱和液体水平交叉流动中沸腾在饱和的液体中沸腾的膜，其特征在于FRoude数（FR）的低幅度的浮力和流动惯量的综合影响。通过使用耦合水平集合和流体接口捕获方法的耦合水平集和体积，通过用于二维非结构化网格上的相变问题的计算框架来确定液体 - 蒸汽接口和随后的蒸汽唤醒动力学。虽然沸腾循环的Quasisteady性质随着FR增加而逐渐丢失，但在混合制度中显示出相对于重力的交叉流量取向的效果是不动的。正交重力和流场的直接后果是传热的异常损伤，在某些条件下的交叉流速的增加，详细讨论。同时，也确定了由其他几种流体动力学和热参数影响的薄膜沸腾行为。浮力和惯性之间的相互作用进一步突出，同时讨论了用水平交叉流动的混合状态下的相互依存液体和蒸汽唤醒特性。显示液体唤醒行为，不仅可以从凹槽体几何形状而且产生瞬时蒸汽唤醒轮廓，而壁过热会影响唤醒相互作用的时间量表。最后，提出了减少因子（XI）并确定为FRoude数的函数，其与向上横流膜沸腾的相关性以预测热传递。通过AIP发布在许可证下发布。

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