Abstract
The present research considers the initial stage of nucleate boiling with high heat fluxes releasing from the technical surface. We show new experimental data on the dynamics of the vapor phasein subcooled water flow in the channel under nonstationary heat release conditions. The heat release dissipation on the heater was performed by passing a controlled three–phase rectified electric current through a tube with a pulse duration of τimp = 60—300 ms with a heating rate of 1000—6000 K/s. We studied the formation dynamics and the structure of the vapor–liquid layer near the heat releasing wall and monitored the temperature state of the wall depending on the parameters of the heater’s flow and the intensity of heating of the cylindrical wall.
Highlights
Studies of liquid boiling processes under the conditions of the beginning crisis remain relevant due to the present lack of convincing methods for calculating unsteady boiling [1]
At the stage of bubble boiling, it is impossible to quantitatively determine the evaporation centers density [2], which is a key value for calculating the heat transfer coefficient and the onset time of the intense vapor formation
We face the problem of expanding the experimental data on the conditions of onset and development of heat-exchange crisis modes
Summary
Studies of liquid boiling processes under the conditions of the beginning crisis remain relevant due to the present lack of convincing methods for calculating unsteady boiling [1]. At the stage of bubble boiling, it is impossible to quantitatively determine the evaporation centers density [2], which is a key value for calculating the heat transfer coefficient and the onset time of the intense vapor formation. In this regard, we face the problem of expanding the experimental data on the conditions of onset and development of heat-exchange crisis modes. This study is focused on the development stages a heat exchange crisis under unsteady conditions on large-sized heaters
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