NUMERICAL INVESTIGATION ON CONJUGATE HEAT TRANSFER FROM SUDDEN EXPANSION FLOW USING NANOFLUIDS
Keywords:
Sudden Expansion, Nano Fluid, Recirculation, Conjugate Heat Transfer, Nusselt NumberAbstract
Laminar two-dimensional sudden expansion flow of different nanofluids is studied numerically. The governing equations are solved using unsteady stream function-vorticity method. Conjugate heat transfer from the sudden expansion flow is reported for nanofluid. The effect of volume fractionof the nanoparticles and type of nanoparticles on heat transfer is examined and found significant impact. Local Nusselt number and average Nusselt number are reported in connection with various nanoparticle, volume fraction and Reynolds number for expansion ratio 2. Heat transfer inside and around recirculation eddy differ from rest of the channel with respect to nanoparticles and volume fraction. Symmetry plane temperature shows local peak value. Nusselt number reaches peak values near the reattachment point and reaches asymptotic value in the downstream. Bottom wall eddy and volume fraction shows significant impact on average Nusselt number. When the solid wall thickness is significant, the uniform temperature distribution inside wall is not a valid assumption. Hence the conjugate heat transfer study arises. Both solid wall heat conduction equation and heat convection in fluid region must be solved simultaneously in conjugate heat transfer problems. Along the solid wall interface, the heat flux from solid wall is same as the heat flux received by fluid region.
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