Transient conjugated mixed-convective heat transfer in a vertical annular passage

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This study presents a numerical solution of the unsteady conjugated mixed-convective heat transfer in an annular passage resulting from a step change in uniform wall heat flux of the core tube. Results indicate that the dimensionless core tube wall thickness, the wall-to-fluid thermal conductivity ratio, and the wall-to-fluid thermal diffusivity ratio have significant influences on the transient heat transfer characteristics. Effects of the ratio of Grashof number to Reynolds number on the unsteady heat transfer are rather insignificant at the early transient.