Experimental Investigation of the Change in Temperature at the Center of a Water Droplet in the Process of Evaporation in Heated Air

Abstract

The paper presents the results of an experimental investigation of the change in the temperature at the interface between water and a thermocouple junction (of diameter 1 mm) in a droplet (initial radius 1.5–3 mm) in the process of heating and evaporation of the latter in an air stream (of temperature 350–800 K at the velocity of motion 0.1–3.5 m/s). The lifetimes of droplets (of their complete evaporation) have been determined. It is shown that the temperature at the droplet center changes by no more than 10 K in the process of evaporation at gas temperatures of less than 500 K. At higher temperatures of the external gas medium the droplet is heated intensely (the temperature field is homogeneous).