Purpose

This paper aims to carry out numerical study on growth of a single bubble from a curved hydrophilic surface, in nucleate pool boiling (NPB). The boiling performance associated with NPB on a curved surface has been analyzed in contrast to a plane surface.

Design/methodology/approach

Commercial software ANSYS Fluent 2021 R1 has been used with its built-in feature of interface tracking based on volume of fluid method. For water as the working fluid, the effect of microlayer evaporation underneath the bubble base has been included with the help of user-defined function. The phase change behavior at the interface of vapor bubble has been modeled by using “saturated-interface-volume” phase change model.

Findings

An interesting outcome of the present study is that the bubble departure gets delayed with increase in curvature of the heating surface. Wall heat flux is found to be higher for a curved surface as compared to a plane surface. Effect of wettability on the time for bubble growth is relatively more for the curved surface as compared to that for a plane surface.

Originality/value

Effect of surface curvature has been investigated on bubble dynamics and also on temporal variation of heat flux. In addition, the impact of surface wettability along with the surface curvature has also been analyzed on bubble morphology and spatial variation of heat flux. Furthermore, the influence of wall superheat on the bubble growth and also the wall heat flux has been studied for fixed angle of contact and varying curvature.

中文翻译：

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曲率对亲水曲面泡核沸腾的气泡动力学和相关传热特性的影响

 目的

本文旨在对核池沸腾（NPB）中单个气泡从弯曲亲水表面生长进行数值研究。与平面相比，对弯曲表面上与 NPB 相关的沸腾性能进行了分析。

设计/方法论/途径

使用商业软件ANSYS Fluent 2021 R1，其内置基于流体体积法的界面跟踪功能。对于水作为工作流体，在用户定义的函数的帮助下，已经包含了气泡底部下方微层蒸发的影响。使用“饱和界面体积”相变模型对气泡界面处的相变行为进行了建模。

 发现

本研究的一个有趣结果是，随着加热表面曲率的增加，气泡的离开会延迟。发现与平面相比，弯曲表面的壁热通量更高。与平面相比，曲面上的润湿性对气泡生长时间的影响相对更大。

 原创性/价值

研究了表面曲率对气泡动力学以及热通量随时间变化的影响。此外，还分析了表面润湿性和表面曲率对气泡形态和热通量空间变化的影响。此外，针对固定接触角和变化曲率，研究了壁过热对气泡生长以及壁热通量的影响。