Research Initiation: Experimental Studies of Film and Transition Boiling Heat Transfer

本研究考虑了柱体和球体在过渡沸腾和膜沸腾过程中的自然对流和强制对流沸腾传热。目的是研究表面粗糙度、流体过冷度、液体速度和流体化学对薄膜稳定性的影响。实验方法寻求不稳定的条件和有助于沸腾曲线过渡区域的参数。在各种各样的能源系统中，有效和高效的传热是很重要的，而对流沸腾通常用于这样的系统。沸腾曲线的过渡沸腾区和膜沸腾区通常被视为设备不应运行的区域，因为这些沸腾区内的流动不稳定。这些系统的设计和稳定运行将受益于对所涉及的基本机制的更好理解。

This research considers natural and forced convection boiling heat transfer from cylindrical and spherical bodies in both transition and film boiling. The objective is to investigate the influence of surface roughness, fluid subcooling, liquid velocity, and fluid chemistry on the stability of the thin vapor films. The experimental approach seeks the conditions for instability and the parameters that contribute to the transition region of the boiling curve. Effective and efficient heat transfer is important in a wide variety of energy systems, and convective boiling is often used in such systems. The transition and film boiling regions of the boiling curve are generally viewed as regions where equipment should not operate due to the instability of the flow in these boiling regions. The design and stable operation of these systems will benefit from the better understanding of the basic mechanisms involved.