Experimental investigation on boiling regime transformation when the binary-droplet impact on the superheated surface

This experimental study focuses on the phenomena induced by thermal effects after a two-component droplet of propylene glycol water impinges on a hot substrate. The visualization experiment revealed that this phenomenon is characterized by a shift in the boiling regime of the droplets, which exhibits different transformation patterns with changes in surface temperature and propanediol concentration. On the basis of high-speed camera sequence images, a temperature-concentration regime map is created. Qualitative analysis is performed on the causes of the boiling transformation, as well as the wall temperatures and concentration intervals at which it might occur. The time at which the boiling regime transformation occurs can be determined by analyzing the secondary droplets. In addition, the effects of various boiling regimes and propylene glycol concentrations on the size and velocity distribution of secondary droplets are briefly investigated.

Automated summary

This experimental study investigates the thermal effects induced by a two-component droplet of propylene glycol water impinging on a hot substrate. The visualization experiment reveals that this phenomenon is characterized by a shift in the boiling regime of the droplets, which undergo different transformation patterns with changes in surface temperature and propanediol concentration. A temperature-concentration regime map is created based on high-speed camera sequence images, and qualitative analysis is performed on the causes and conditions of the boiling transformation. The time of boiling regime transformation can be determined by analyzing the secondary droplets, and the effects of different boiling regimes and propylene glycol concentrations on the size and velocity distribution of secondary droplets are briefly investigated.