T. Aragaki et al., NUMERICAL-ANALYSIS OF TURBULENT-FLOW AND HEAT-TRANSFER IN PARALLEL PLATES ATTACHED WITH TURBULENCE PROMOTERS AT REGULAR INTERVALS ON LOWER SURFACE, Journal of Chemical Engineering of Japan, 29(3), 1996, pp. 407-415
To investigate the mechanism of heat transfer augmentation, numerical
computations of turbulent now and heat transfer in a parallel plate ch
annel, attached transversely with turbulence promoters at regular inte
rvals on the lower surface, have been performed by using a simple turb
ulence model and the Galerkin finite element method. It has been revea
led that, in the optimum case, a vortex of peculiar structure is forme
d behind each turbulence promoter, and it plays a significant role in
enhancing the heat transfer rate; and the maximum augmentation effect
reaches about 13% when taking the pumping power into account, while it
is 67% when neglecting the pumping power. It also turns out that the
optimum interval of turbulence promoters is about 10 times the promote
r diameter, and the optimum Reynolds number is about 9000.