Abstract
Joint motion of falling-down liquid film and counter-current gas is considered. Such types of flows occur in falling-film equipment (absorbers, evaporators, reactors) and take place in machines (pumps, compressors, turbines) that are widely used in many industries (energy, chemical, food, metallurgy, pharmaceutical, and biotech). Waves at gas–liquid interface significantly affect the overall process effectiveness, its operation cycle, dynamics, and safety. That makes the waves study quite important for machines design and control development. We present mathematical formalization of the problem, based on the first-principle approach. With the small parameter method, nonlinear non-stationary partial differential equation for the state of the liquid–gas interface is obtained, which describes the liquid–gas interface dynamics. In the equation scope, results of numerical simulation are shown. Wave profiles, phase velocities, amplitudes are calculated. The evolution of periodic disturbances is investigated: it is shown that regular wave profiles are formed at the liquid–gas interface, time formation of the regular waves is obtained. Gas flow effect on the liquid–gas interface is discussed.
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Prokudina, L., Salamatov, Y. (2021). Simulation of Counter-Current Gas Flow in Falling-Film Equipment for Moderate Reynolds Numbers. In: Radionov, A.A., Gasiyarov, V.R. (eds) Proceedings of the 6th International Conference on Industrial Engineering (ICIE 2020). ICIE 2021. Lecture Notes in Mechanical Engineering. Springer, Cham. https://doi.org/10.1007/978-3-030-54814-8_118
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