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首页> 外文期刊>International Journal of Heat and Mass Transfer >Experimental and numerical analysis of quasi-static bubble size and shape characteristics at detachment
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Experimental and numerical analysis of quasi-static bubble size and shape characteristics at detachment

机译：准静态气泡尺寸和形状特征的实验与数值分析

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摘要

When investigating the physical mechanisms responsible for pool boiling heat transfer, individual bubbles are commonly assumed to be spherical. This is done in order to ease the computational expense when solving the Navier-Stokes equations. However, bubbles are observed to deviate from spherical depending on fluid properties, cavity sizes and gravitational field strengths. Since it is bubble detachment volume that dictates ebullition frequency, improvements in detachment size and shape predictions would improve nucleate pool boiling heat and mass transfer models. Recent studies have shown that a numerical treatment of the capillary equation's detachment criterion - which is a result of an interfacial pressure balance analysis - generates profiles corresponding to axis-symmetric quasi-static bubbles for adiabatic conditions. In the present work, this criterion is validated for heat induced bubbles providing the basis for a full analysis of size and shape characteristics of a detaching vapour bubble. A volume detachment correlation is validated for heat induced vapour bubbles and detachment correlations for other size and shape characteristics such as bubble height, width, apex principal radius of curvature, contact angle, and degree of sphericity are developed. Furthermore, a local stress analysis reveals detachment regimes and bubble profile regions.
机译：在研究造成池沸腾热传递的物理机制时，通常认为单个气泡是球形的。这样做是为了减轻求解Navier-Stokes方程时的计算量。但是，根据流体特性，腔体尺寸和重力场强，气泡会偏离球形。由于决定气泡产生频率的是气泡分离体积，因此分离尺寸和形状预测的改进将改善成核池沸腾传热和传质模型。最近的研究表明，对毛细管方程的分离标准进行数值处理（这是界面压力平衡分析的结果），可以生成与绝热条件下的轴对称准静态气泡相对应的轮廓。在目前的工作中，该标准已针对热气泡进行了验证，为全面分析分离的蒸气气泡的尺寸和形状特征提供了基础。验证了体积分离相关性对热诱导蒸气气泡的影响，并开发了其他尺寸和形状特性（例如气泡高度，宽度，顶点主曲率半径，接触角和球形度）的分离相关性。此外，局部应力分析揭示了脱离状态和气泡轮廓区域。

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