Flow film boiling on a sphere in the mixed and forced convection regimes

IF 3.6 2区 工程技术 Q1 MECHANICS Journal of Fluid Mechanics Pub Date : 2024-08-14 DOI:10.1017/jfm.2024.514
Rohit Kumar, B. Premachandran
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引用次数: 0

Abstract

Saturated flow film boiling on a sphere has been numerically studied in this work for both vertical and horizontal flow configurations. The simulations were performed using a numerical methodology developed by the authors for boiling flows on three-dimensional unstructured meshes. For interface capturing, the coupled level set and volume of fluid method is used. The interface evolution, vapour wake dynamics and heat transfer have been thoroughly investigated by varying the saturated liquid flow velocity, sphere diameter and wall superheat. The relative importance of both the buoyancy and the inertial forces is described in terms of the Froude number $(Fr)$ . The vapour bubble evolves periodically at low $Fr$ values, while a stable vapour column develops at high $Fr$ values. The interface evolution pattern obtained in the present work is in good agreement with the results of experimental studies available in the literature. For all the values of $Fr$ , a stable vapour column develops for a large-diameter sphere and releases vapour bubbles of varying sizes. Furthermore, for a large-diameter sphere, surface capillary waves are observed at the interface, similar to the observations of some of the experimental studies available in the literature. The flow in the liquid and vapour wakes appears to be strongly coupled. The heat transfer in the present work is estimated using the spatially and temporally averaged Nusselt numbers. Finally, an fast Fourier transform analysis of the space-averaged Nusselt number reveals a strong interaction among the different forces.
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混合对流和强制对流状态下球面上的流膜沸腾
本研究对球体上的饱和流膜沸腾进行了垂直和水平流动配置的数值研究。模拟采用了作者针对三维非结构网格上的沸腾流开发的数值方法。对于界面捕捉,采用了水平集和流体体积耦合方法。通过改变饱和液体流速、球体直径和壁面过热度,对界面演变、蒸汽唤醒动力学和热传递进行了深入研究。浮力和惯性力的相对重要性用 Froude 数 $(Fr)$ 来描述。在低 Fr 值时,蒸汽气泡呈周期性演变,而在高 Fr 值时,则形成稳定的蒸汽柱。本研究获得的界面演变模式与文献中的实验研究结果非常吻合。在所有的 $Fr$ 值下,大直径球体都会形成稳定的蒸汽柱,并释放出不同大小的蒸汽泡。此外,对于大直径球体,在界面处观察到表面毛细管波,这与文献中一些实验研究的观察结果相似。液体和蒸汽波中的流动似乎是强耦合的。本研究使用空间和时间平均的努塞尔特数估算传热。最后,对空间平均努塞尔特数进行的快速傅立叶变换分析揭示了不同作用力之间的强烈相互作用。
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来源期刊
CiteScore
6.50
自引率
27.00%
发文量
945
审稿时长
5.1 months
期刊介绍: Journal of Fluid Mechanics is the leading international journal in the field and is essential reading for all those concerned with developments in fluid mechanics. It publishes authoritative articles covering theoretical, computational and experimental investigations of all aspects of the mechanics of fluids. Each issue contains papers on both the fundamental aspects of fluid mechanics, and their applications to other fields such as aeronautics, astrophysics, biology, chemical and mechanical engineering, hydraulics, meteorology, oceanography, geology, acoustics and combustion.
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