Abstract
The presented mathematical model enables calculation of the wave surface profile, as well as the fields of velocity and temperature, in falling wavy liquid films. Numerical simulation of wave formation and heat transfer intensity was performed for falling films of liquid nitrogen. Different activation functions for input perturbations were checked for films with different parameters. The dependencies of the time till boiling onset and total local evaporation time on the heat flux density were calculated for different inlet Reynolds numbers. Generalization of the simulation results resulted in a regime map, which describes different mechanisms of film flow decay. The presented results of numerical simulation are in satisfactory agreement with the experimental data.
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Funding
The work was carried out at the IT SB RAS with the financial support of the RFBR (grant no. 18-08-00402_a in the part of numerical simulation of wave characteristics in a flowing liquid film) and the Federal Program for Basic Research of State Academies of Sciences for 2013–2020 (theme III.18.2.3, AAAA-17-117030310025-3 in the part of numerical simulation of heat transfer during evaporation in a flowing liquid film).
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Chernyavskiy, A.N., Pavlenko, A.N. Numerical Simulation of Wave Formation and Heat Transfer in Falling Liquid Films at Unsteady Heat Release. J. Engin. Thermophys. 29, 181–185 (2020). https://doi.org/10.1134/S1810232820010130
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DOI: https://doi.org/10.1134/S1810232820010130