Abstract
Technique for measurements of the evaporation rate of a heated liquid layer is presented. The local minimum is observed which is associated with the point of equilibrium of the liquid–gas interface. It is shown when no heat is applied to the heating element temperature in gas phase is larger than in liquid, and evaporation occurs with the rate of 0.014–0.018 μl/s. Then evaporation rate is decreasing with increasing the heater temperature until the equilibrium point is reached at the liquid–gas interface. Further increasing of the heater temperature leads to increasing of the evaporation rate.
Highlights
Investigation of evaporation process in a two–layer system under non–isothermal conditions is important for many applications, such as microelectronics cooling [1]
We present the results of the evaporation rate measurements of the locally heated liquid layer
Let us discuss the data on the temperature profile across water–air system near interface obtained in Ref. [4]
Summary
Investigation of evaporation process in a two–layer system under non–isothermal conditions is important for many applications, such as microelectronics cooling [1]. The resulting convection can significantly increase the evaporation rate [5]. Investigations of the temperature profile near liquid–gas interface and the conditions when the equilibrium state at the interface is reached for complex system are important from the practical and fundamental point of views. Evaporation occurs under non–equilibrium conditions and the continuity of the temperature at the interface can not be ensured.
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