Experimental investigation of conjugate natural convection heat transfer from a horizontal isothermal cylinder with a nonisothermal longitudinal plate fin at various angles

Abstract

Steady laminar natural convection heat transfer from a horizontal isothermal cylinder in water with a single nonisothermal longitudinal plate fin at various angles is studied experimentally. Results are obtained at a Rayleigh number of approximately 4.0 × 10 5 with a fin length to cylinder diameter ratio of 0.2 and a Prandtl number near 5. Local fin temperatures and heat transfer from the fin and cylinder are obtained using a Mach-Zehnder interferometer. Overall heat transfer measurements are made from thermocouple and multimeter data for comparison. The total heat transfer does not change significantly from the bare cylinder value. The plume separation shifts from above the heated cylinder to the fin tip when the fin is within 50° of the upward vertical position.