Abstract
The article deals with the development of CFD (Computational Fluid Dynamics) model of natural draft wet-cooling tower flow, heat and mass transfer. The moist air flow is described by the system of conservation laws along with additional equations. Moist air is assumed to be homogeneous mixture of dry air and water vapour. Liquid phase in the fill zone is described by the system of ordinary differential equations. Boundary value problem for the system of conservation laws is discretized in space using Kurganov-Tadmor central scheme and in time using strong stability preserving Runge-Kutta scheme. Initial value problems in the fill zone is solved by using standard fourth order Runge-Kutta scheme. The interaction between liquid water and moist air is done by source terms in governing equations.
Highlights
The principle of evaporative cooling is connected with releasing of latent heat during water evaporation
Releasing of latent heat is leading to an increase in moist air temperature which is connected with decrease of moist air density
Water inlet mass flow rate is mw = 17200 kg/s
Summary
The principle of evaporative cooling is connected with releasing of latent heat during water evaporation. Releasing of latent heat is leading to an increase in moist air temperature which is connected with decrease of moist air density. The density of warmed moist air is lower unlike the density of surrounding moist air This density difference together with sufficient cooling tower height is creating natural draft. Necessary condition for evaporative cooling is existence of mass transfer between water and moist air which is connected with difference in saturated specific humidity at water temperature x (tw) and moist air specific humidity x x (tw) − x) > 0. This idea is based on assumption about existence of thin film of saturated moist air at water temperature on the interface of water and moist air
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