CAREER: Characterization of Liquid Sprays Impacting Hot Surfaces in Cooling Applications: Emphasis on the Pre-Impact Process

摘要这项拟议的研究旨在描述液体喷雾在冷却应用中撞击热表面的特性。重点放在撞击前的过程和雾滴直径小于150毫米的喷雾上。具有如此细小液滴的喷雾更容易受到周围条件的影响。该项目的目标是确定在喷雾冷却应用中实现最大稳定高热流密度的最佳条件。实验将测量不同条件下的液滴速度、大小和温度。诸如Exciplex荧光技术等创新技术将被用于测量飞行中液滴的温度。有限差分模拟将使用k-e模型来描述气相湍流。教育计划包括让本科生参与该项目，并将从研究中获得的知识融入现有课程。

ABSTRACT The proposed research seeks to characterize liquid sprays impacting hot surfaces in cooling applications. The emphasis is on the pre-impact process and sprays with droplets that are less than 150 mm in diameter. Sprays with such fine droplets are more susceptible to the influence of the surrounding conditions. The goal of the project is to determine the optimal conditions for achieving maximum stable high heat flux in spray cooling applications. Experiments will be conducted to measure the droplet velocity, size, and temperature under different conditions. Innovative techniques such as the Exciplex Fluorescence Technique will be used to measure the temperature of in-flight droplets. Finite difference simulations will be carried out using a k-e model to describe gas phase turbulence. The educational plan includes participation of undergraduate students in the project and integration of the knowledge gained from the research into existing courses.