Droplet Formation and Impingement Dynamics of Low-Boiling Refrigerant on Solid Surfaces with Different Roughness under Atmospheric Pressure

The dynamic behavior of droplet impingement is one the most important processes spray cooling. Although refrigerants with a low boiling point have been widely used in cooling, their high volatility makes it difficult to generate stable under atmospheric pressure, and thus rarely reported. Therefore, great significance study refrigerant fill relevant research gaps. In this paper, an experimental system for single generation at pressure has established. By means high-speed photography technology, morphology dynamics R1336mzz(Z) on grooved carbon steel walls studied. Phenomena such as truncated sphere, boiling, finger-shaped disturbance were observed, reasons responsible them analyzed. effects Weber number (We) surface roughness (Ra) spreading factor (β) investigated quantitatively. Higher We always causes larger βmax, while Ra different influence βmax. Cassie–Wenzel transition occurs when increases from 1.6 μm 3.2 μm, leading rapid decrease An empirical formula proposed predict βmax conditions.