Numerical simulation of heat transfer induced by a body moving in the same direction as flowing fluids

Abstract

Variations of flow held and heat transfer induced by a body moving in the same direction as flowing fluids in a channel were studied numerically This situation is cataloged to a kind of moving boundary problem and an arbitrary Lagrangian-Eulerian description method with a Galerkin finite element formulation is adopted to analyze this problem. Several different moving velocities of the body and Reynolds numbers are taken into consideration, The results show that the fluids simultaneously complement the vacant space induced by the movement of the body and new recirculation zones are formed near the body. These phenomena are remarkably different from those of the moving body regarded as a stationary body in the flowing fluids by a relative velocity viewpoint. Heat transfer rates of the body are enhanced significantly as the body moves rapidly, but the slight enhancement is indicated as the body moves slower than the flowing fluids, In the computing range, the mean global Nusselt numbers Nu can be approximately expressed as the form of Nu = 0.62 Re*(1/2) - 2.95.