Two-phase flow transport heavily depends on the generalized interfacial drag force term in the two-fluid model. The impact of accurate design and prediction associated with thermal energy systems is highly sensitive to multi-phase heat transfer characteristics. Because of this, the interfacial drag force has been studied with rigor for some time. The steady state drag force component in particular has been well characterized for rising single bubbles but has not been previously experimentally separated into its skin and form drag components. Historically, experimental studies were unable to measure the pressure distribution around a bubble to determine the form drag force along the bubble interface. This paper presents the outcomes of an experimental study wherein a new experimental method was developed which, for the first time, separates the form and skin drag coefficients on rising bubbles. Eleven air bubbles sizes representing spheroidal, ellipsoidal, and transition to spherical cap regimes (10²<Re<10⁴) were studied in a water test loop with velocity fields measured via particle image velocimetry; pressure fields were then synthesized from these velocity fields through the Queen2 algorithm. The skin and form drag coefficients were separated for single bubbles which showed a nominal trend of increasing form drag contribution with increasing Reynolds number. This work presents a new method and new outcomes for rising bubbles over several bubble regimes and includes a comprehensive uncertainty characterization of the resulting data.

两相流传输在很大程度上取决于两流体模型中的广义界面阻力项。与热能系统相关的准确设计和预测的影响对多相传热特性高度敏感。正因为如此，一段时间以来，人们对界面阻力进行了严格的研究。特别是稳态阻力分量已被很好地表征为上升的单个气泡，但之前尚未通过实验将其分离成其表皮和形成阻力分量。从历史上看，实验研究无法测量气泡周围的压力分布，以确定沿气泡界面的形式阻力。本文介绍了一项实验研究的结果，其中开发了一种新的实验方法，这是第一次，分离上升气泡的形状和蒙皮阻力系数。11 个气泡大小，代表球体、椭圆体和向球冠状态的过渡 (10² <Re<10 ⁴ ) 在水测试回路中研究，速度场通过粒子图像测速法测量；然后通过 Queen2 算法从这些速度场合成压力场。对于单个气泡，表层阻力系数和形式阻力系数是分开的，这表明随着雷诺数的增加形式阻力贡献增加的名义趋势。这项工作提出了一种新方法和新结果，用于在几种泡沫状态下上升泡沫，并包括对所得数据的全面不确定性表征。