Numerical Simulation Of Mechanical Ventilation Cross Flow Cooling Tower

Based on the present numerical research of the cooling tower, this thesis analyses and discusses the procedure of the heat and mass transfer between air and water inside the crossflow wet cooling tower.With a mechanical crossflow wet cooling tower to be a typical pattern, this thesis uses discrete phase model for the heat and mass transfer inside the cooling tower. The FLUENT program is applied for numerical simulation on the cooling tower, in which the film nature of the water flow in the fill zone has been approximated by droplets flow, and the required heat and mass transfer have been achieved by controlling the droplet velocity. Through calculation, several pictures about the distribution of varied parameters, such as air flow velocity vector, pressure, water temperature, was drew.This thesis optimizes the cooling tower in two sizes. First optimizes the effectiveness of the heat transfer of original crossflow tower, which include two parts: One, through calculation of the air speed distribution, the result indicates that uniform air speed distribution has better effectiveness to heat transfer. Two, optimizes the water spray density, the result indicates that larger water spray density in the inner layer is favorable to heat transfer.Second this thesis optimizes the layout of the filling of the cooling tower. The result indicates that the improved cooling tower has better effectiveness to heat transfer. But the shortcoming is that the improved cooling tower has larger floor area, to settle this problem, some primary measures are provided.Conclusively, the results of this thesis provide the theoretical base and abundant researching data for the optimization of the cooling tower.