Abstract:
Heat transfer enhancement in presence of nanofluid by the effect of mixed convection in a
lid driven cavity are often encountered in engineering systems which has been studied
numerically. A Cartesian co-ordinate system is used with the origin at the lower left corner
of the computational domain. The system consists of a double lid driven cavity with a heat
generating object centered at the origin. Upper and lower lids are kept adiabatic. Two cases
are considered, for case I left and right lids are moving in upward direction while for case
II upper and lower lids are moving in opposite direction. The governing equations are
solved by employing a finite-element method based on Galerkin weighted residuals. The
investigations are conducted for different values of Reynolds number, solid fluid thermal
conductivity ratio, Richardson number, heat generation parameter and solid volume
fraction. Streamlines, isotherms, heatlines and heat transfer rate in terms of the average
Nusselt number (Nuav), average temperature (θav), maximum temperature, and the average
heat flux magnitude for two above mentioned cases are presented for the aforesaid
parameters. The results indicate that the mentioned parameters strongly affect the flow
phenomenon and temperature field inside the cavity. Comparisons with previously
published work are performed and the results are found to be in excellent agreement.
