| Abstrakt: |
This paper represents a 3D numerical study of turbulent mixed convection of air in horizontal smooth pipe with the variation of Reynolds number (Re=74100, 33130, 23423, 10480,7410) and Grashof number while keeping the Richardson number constant (Ri=1). The mathematical model used here consists of Reynolds averaged Navier-Strokes and energy equation with REAL-k-e turbulence model which is solved using finite volume method. Validation is done with the previous works in terms of axial velocity profile, dimensionless mean axial velocity (u+), and mean temperature (T+) profiles in the inner and outer region of the pipe. Later, the effect of variation of Reynolds number and Grashof number in the fully developed turbulent mixed convection regime is observed in terms of axial velocity and isothermal contours, secondary velocity vector with streamlines, u+ and T+ profiles. From the result, it is seen that axial velocity profiles are asymmetric for all Reynolds numbers with slight variations and maximum velocity is displaced towards the bottom of the pipe. In the inner region, as the Reynolds number and Grashof number decrease, the non-dimensional velocity u+ and temperature T+ increase but an opposite trend is seen for the outer region of the pipe. [ABSTRACT FROM AUTHOR] |
