Wall transpiration on mixed convection heat transfer in a square duct rotating about a parallel axis

摘要

A detailed numerical study, using the voticity-velocity method, ahs been carried out to examine the wall tran-spiration on mixed convection flow and heat transfer in a square duct rotating about a parallel axis. The prediction was presented for various parameters, wall reynolds number Re_w, rotational Reynolds number J, and rotational Grashof number Gr_( OMEGA ). Typical developments of axial velcoity, secondary flow, and temperature at various axial locations in the entrance region are pre-sented. Both local cirumferentially averaged friction factors f Re and Nusselt number Nu in the developing region are examined. The predicted results disclosed that the wall transpiration effect has considerable impact on the flow and heat transfer characteristics. Re-sults also showed that both circumferentially averaged friction factor and Nusselt number are enhanced with an increase in J or Gr_( OMEGA ), except for the range of J < 400 or Cr_( OMEGA ) <1000.