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The thermal efficiency of near-wall gas-droplets screens. I: Numerical modeling. (English) Zbl 1189.76662
Summary: Present work is directed to further perfection of a modeling of the structure and heat transfer processes in gas-droplets near-wall screens in a tube. The problem statement in the present work is based on the Eulerian-Eulerian two-fluid model for transport processes in the gas and dispersed phases in the turbulent gas-droplets jet. We used the model [High Temp. 40, No. 1, 78 (2002)] for computation of averaged motion, heat transfer and squared velocity fluctuations of dispersed phase. The gas phase turbulence was modeled with the LRN \(k- \tilde {\varepsilon }\) model with taking into account the effect of evaporating droplets on the kinetic turbulence energy and the rate of its dissipation. The present paper takes into account the influence of droplets deposition and vaporization of deposited particles on the tube wall and particles evaporation in the near-wall jet. Developed numerical model was tested by comparison with experimental and numerical data for gas-droplets non-isothermal flow in a tube and in a near-wall screen.

MSC:
76T10 Liquid-gas two-phase flows, bubbly flows
76M20 Finite difference methods applied to problems in fluid mechanics
80A20 Heat and mass transfer, heat flow (MSC2010)
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