Effect of fin length on the heat source Inside cavity on the natural convection of nanofluid and efficiency in different Rayleigh numbers

چکیده مقاله

In this thesis, the numerical study of flow field and heat transfer of nanofluid in a square cavity with the constant temperature heat source at the bottom and a thick fin attached to heat source has been executed.With parametric studies, the effects of using nanofluid and existence of fin on heat transfer has been evaluated. considering the single-phase model of Newtonian fluid, using the finite volume method for non-uniform grid and Simpler algorithm for coupling speed - pressure, governing equations are solved. Regarding the desired conditions in this thesis, Results from numerical simulations of flow field and heat transfer in different conditions with variation of Rayleigh number and length of fin have been investigated . Analyzing the results of numerical simulations indicated that with increasing the Rayleigh number, the average Nusselt number increases. The efficiency values of fin for a marked thick showed increase in length of fin at a certain Rayleigh number, increases efficiency and Increasing the Rayleigh number is increased efficiency of fin.