난류 파이프 유동 내 물질전달에서의 경계조건 영향

다국어 초록 (Multilingual Abstract)

Direct Numerical Simulation(DNS) of turbulent mass transfer in fully developed turbulent pipe flow has been performed to study the effect of wall boundary conditions on the concentration fields at Re<SUB>τ</SUB>=180 based on friction velocity and pipe radius. Fully developed turbulent pipe flows for Sc=0.71 are studied with two different wall boundary conditions, namely, constant mass flux and constant wall concentration. The mean concentration profiles and turbulent mass fluxes obtained from the present DNS are in good agreement with the previous numerical results currently available. To investigate the effects of wall boundary condition on the turbulent mass transfer, the mean concentration profile, root-mean-square of concentration fluctuation, turbulent mass fluxes and higher-order statistics(Skewness and Flatness factor) are compared for the two cases. Furthermore, the budgets of turbulent mass fluxes and concentration variance were computed and analyzed to elucidate the effects of wall boundary conditions on the turbulent mass transfer.

참고문헌 (Reference)

1 Antonia, R.A, "Turbulent Prandtl number in the near-wall region of a turbulent channel flow" 34 (34): 1905-1908, 1991

2 Kim, J, "Turbulence statics in fully developed channel flow at low Reynolds number" 177 : 133-166, 1987

3 Saha, S, "The influence of pipe length on thermal statistics computedfrom DNS of turbulent heat transfer" 32 : 1083-1097, 2011

4 Kader, B.A, "Temperature and concentration profiles in fully turbulent boundary layers" 24 (24): 1541-1544, 1981

5 Eggels, J.G.M, "Fully developed turbulent pipe flow : a comparison between direct numerical simulation and experiment" 268 : 175-209, 1994

6 Redjem-Saad, L., "Direct numerical simulation of turbulent heat transfer inpipe flows: Effect of Prandtl number" 28 : 847-861, 2007

7 Satake, S, "Direct numerical simulation of turbulent heat transfer in an axially rotating pipe flow; Reynolds shear stress and scalar flux budgets" 12 (12): 958-1008, 2002

8 Piller, M, "Direct numerical simulation of turbulent forced convection in a pipe" 49 : 583-602, 2005

9 Kasagi, N, "Direct numerical simulation of passive scalar field in a turbulent channel flow" 114 : 598-606, 1992

10 Kawamura, H, "DNS of turbulent heat transfer in channel flow with respect to Reynolds and Prandtl number effects" 20 : 196-207, 1999

11 Kawamura, H., "DNS of turbulent heat transfer in channel flow with low to medium-high Prandtl number fluid" 19 : 482-491, 1998

12 Bejan, A., "Convection Heat Transfer" Wiley 2004

13 Kim, J., "Application of a fractional-step method to incompressible Navier-Stokes equations" 59 : 308-323, 1985

14 Akselvoll, K., "An efficient method for temporal integration of the Navier-Stokes equation in confined axisymmetric geometries" 125 : 454-463, 1996