Numerical Study Of Natural Convection For Closed Chamber

Researching the indoor air natural convection behavior and the basic characteristics is themain way and theoretical basis to control and adjust construction of the indoor environment. Inthis paper the numerical calculation method was used to study the indoor air natural convectionphenomenon, analyzes the indoor heat transfer process, and concludes the indoor temperatureand the flow field distribution.First of all, this paper studies the convective heat transfer theory and numerical calculationmethod, especially the finite difference method for uniform mesh. This paper carries thecalculated average Nusselt number Nu compares with G. De Vahl Davis benchmark, themaximum error within3%, verify the correctness of this method.Secondly, the paper researches the indoor complex heat convection problem, this is means tolook for the influence of the indoor natural convection heat transfer when change building aspectratio, shape of the roof, indoor heat source and other factors. The solution is: when B=3Nuhave maximum value, the total quantity of heat transfer from low temperature wall to hightemperature wall is most; the Nu of vaulted is bigger than when its double slope house roof,suggest the north use the arched canopy to increase the natural convective heat; the heat locationhas an important effect for heat exchange, when Ra=10~3, It is better to place the central sourceagainst the wall, when Ra=10~6, it should be placed in the central of the room.At last, the article analysis turbulence indoor natural convection at high Ra and get theresults that Ra=10~7and Ra=10~8belongs to the excessive area between laminar and turbulent,after Ra=10~9, the turbulent transient calculation method can achieve a good convergence effect,get more accurate also.In this paper, the results are versatile, which provide a basic role for the study of3d model,turbulent and such complex indoor convection. Because of the dimensionless control equationare used in all models. The results provide the theoretical basis and guidance for optimizationdesign indoor air organization form.