Transient Conjugated Heat Transfer Analysis from a Sphere with Nonlinear Boundary Conditions

摘要: The problem of conjugate unsteady convective and radiative heat transfer from a solid spherical particle is numerically investigated for Reynolds numbers up to 100 using Chebyshev-Legendre spectral method. treatment nonlinear boundary condition the radiation sphere surface assessed successfully implemented. This work an extension previous effort simulating flow around method include transfer. assumption quasi-steady field calculation compared with fully transient both temperature fields. It found that underestimates overall rate at very early time stages (up 9% underestimation mean Nusselt number). However, discrepancy becomes smaller as elapses. underprediction larger number increases fixed Prandtl number. results different alternate radiation-conduction cases are presented.