Abstract
Steady, laminar, mixed convection in the fully developed region of horizontal internally finned tubes is investigated for the case of uniform heat input axially and uniform wall temperature circumferentially. The fluid flow and heat transfer characteristics are found to be dependent on a modified Grashof number Gr +, Prandtl number Pr, number of fins M and the relative fin height H. Governing differential equations are solved numerically for the parametric range M = 4 and 16, H = 0, 0.2, 0.5 and 0.8, Pr = 7 and Gr + = 0 to 2 × 10 6. Computed results include the secondary flow components, axial velocity and temperature distributions, wall heat flux, friction factor and average Nusselt number. Internal finning is found to retard the onset of significant free convective effects and to suppress the enhancements in friction factor and Nusselt number compared to smooth tubes. Satisfactory agreement is obtained between the present numerical results and previous experimental data.
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