| Issue |
MATEC Web Conf.
Volume 194, 2018
Heat and Mass Transfer in the Thermal Control System of Technical and Technological Energy Equipment (HMTTSC-2018)
|
|
|---|---|---|
| Article Number | 01059 | |
| Number of page(s) | 5 | |
| DOI | https://doi.org/10.1051/matecconf/201819401059 | |
| Published online | 21 August 2018 | |
Dynamics of dry spots in the liquid film moved by the gas flow in the mini-channel under intensive local heating
1
Kutateladze Institute Institute of Thermophysics, 630090 Novosibirsk, Russia
2
Kutateladze Institute Institute of Thermophysics, 630090 Novosibirsk, Russia
* Corresponding author: egor_tkachenko@mail.ru
Experimental studies of hydrodynamics and the heat transfer crisis were carried out for a two-phase stratified flow in a mini-channel with intensive heating from a heat source of 1x1 cm2. It has been established that as the heat flow increases, the total area of dry spots on the heater increases, but when a certain temperature of the heater surface reaches ≈100 °C, the area of dry spots begins to decrease. With the help of high-speed visualization (shooting speed 100000 frames per second), several stages of formation of a dry spot (a typical size of the order of 100 microns) were isolated. It was found that at a heat flux of 450 W/cm2 about 1 million dry spots per 1 second are formed and washed on the surface of the heater (1 cm2). The speed of the contact line when dry spot is forming reaches 10 m/s.
© The Authors, published by EDP Sciences, 2018
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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