Nusselt-Rayleigh correlations for free convection in 2D air-filled parallelogrammic enclosures with isothermal active walls

作者：Bairi A^*; Zarco Pernia E; Garcia de Maria J M; Bauzin J G; Alilat N; Laraqi N; Gutierrez F

来源：Heat and Mass Transfer, 2011, 47(5): 589-595.

DOI：10.1007/s00231-010-0750-z

In the present study Nu-Ra-alpha correlations are proposed to calculate the steady-state natural convection heat transfer taking place in 2D air-filled cavities of parallelogrammic section. The thermal conditions and the dimensions of the enclosures permit to cover a large range of Rayleigh numbers, 1.7 x 10(3) a parts per thousand currency sign Ra a parts per thousand currency sign 3.0 x 10(9), suitable for diverse engineering applications. The two active walls of the cavities are kept vertical and isothermal at hot and cold temperatures T (h) and T (c) respectively. Separated by a horizontal distance H, they have the same height H and are connected by a closed adiabatic channel whose upper and lower walls can be inclined at an angle alpha with respect to the horizontal, varying between -60A degrees to +60A degrees. That gives rise to a conducting or insulating cavity, in the convective sense of the term (diode cavity). A computational model based on the finite volume method is used to solve the governing equations. The large number of treated configurations led to propose Nu-Ra-alpha correlations for large ranges of Ra and alpha which can be applied to many engineering areas. The results of this numerical study have been successfully compared with calculated and measured available data.

• 出版日期2011-5