Steady forced convection heat transfer from a heated Cam shaped tube to power-law fluid

In many kinds of heat exchangers it is used tubes with circular cross section shape, but in this research, a cam shaped cross section tube as one of them in the instrument has been considered. Forced convection heat transfer to power-lawfluids from a heated cam shaped tube (assumed as cylinder here) in the steady flow has been investigated numerically by solving the momentum and thermal energy equations using finite volume method and the coupled scheme on astructure grid. Reynolds number is Re  5, 10, 20, 30, 40 and power law index is n  0.8, 1, 1.2 at a constant Prandtl number of 1 . The governing field equations have been solved by using a second-order accurate finite volume method todetermine the drag coefficient, flow patterns and to investigate their dependence on power law index and Reynolds number.  In cylinder (Fig. 1.) is   50,60,70,80,91,100 and Tangential. Results show that Nusselt number and heat transfer of cam shaped cylinder with 91   is greater than other cam shaped cylinder and circular cylinder. The globalcharacteristics such as drag coefficients and average Nusselt number are calculated and the representative streamline contours are presented for the above range of conditions. It has been found that the average Nusselt number increases with Reynolds number for all n considered here and cam shape cylinder with 91   has the highest heat transfer rate.

Keywords:

Heat convection , power-law , heat exchangers , non-Newtonian fluid , Nusselt number