Abstract
Thin films evaporation of distilled water, ethanol and HFE-7100 liquid was experimentally studied. The dependences of heat transfer coefficients in time were determined. It has been established that with a decrease in the layer thickness of distilled water and ethanol, the heat transfer coefficient increases. For the HFE liquid, the nature of the change is different: as the time increases, the heat transfer coefficient decreases.
Highlights
At present, development of industries is proceeding along the path of increasing the energy saturation of equipment [1,2,3]
The research was conducted on the experimental setup simulating the conditions of boiling and evaporation of liquid thin layers [11]
The initial thickness of the layer for ethanol was 1 mm, distilled water and liquid HFE-7100 was 1.5 mm, which corresponds to liquid volumes of 2 ml for ethanol and 3 ml for distilled water and HFE-7100 liquid
Summary
Development of industries (metallurgy, microelectronics, etc.) is proceeding along the path of increasing the energy saturation of equipment [1,2,3]. One particular problem of technique is the creation of systems for thermal operating conditions of the equipment [4, 5]. It is necessary to create energy efficient systems based on phase transitions [68]. Thin films of liquids are used in industrial technologies, for example, for cooling locally heated surfaces [9, 10]. The heat transfer coefficient determines the intensity of heat transfer and characterized the liquid-vapor or liquid-air interface. The layer thickness is one of the significant factors affecting the heat transfer coefficient under evaporation conditions of a thin liquid film on the heat exchange surface
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