Experimental Study and Modeling of Subcooled Bubbly Boiling Flow

本文旨在实验研究过冷气泡沸腾流在管内加热的环空中的基本传热问题。在这种流动中，传热可以发生在壁面与蒸气之间、壁面与液体之间、液体与蒸气之间，潜热在汽化过程中被吸收。通过非常详细的时间分辨速度和温度的测量，以及流动可视化，作者希望获得基本的知识，以制定一个比现有的更全面的理论模型。特别是，PI希望研究湍流在这一过程中的作用。他建议对R113和水这两种流体做这样的实验，以确定他的结论的普遍性。这项工作的最终目标是在这些测量的基础上建立一个过冷沸腾流的机制模型。

This proposal seeks to study experimentally fundamental heat transfer issues for subcooled bubbly boiling flow in the annulus between two tubes, the inner one heated. In such flows, heat transfer can take place between the walls and the vapor, between the walls and the liquid, between liquid and vapor, and latent heat is absorbed in the vaporization process. By means of very detailed measurements of time resolved velocity, temperature, and by flow visualization, the author hopes to gain the basic knowledge to formulate a more comprehensive theoretical model than presently exists. In particular, the PI hopes to investigate the role of turbulence in this process. He proposes to do this for two fluids, R113 and water to determine the extent of universality of his conclusions. The final objective of the work is to develop a mechanistic model of subcooled boiling flow on the basis of these measurements.