Accession Number : AD0757993

Title :   Periodicity of Combined Heat Transfer from Horizontal Cylinders.

Descriptive Note : Technical rept.,

Corporate Author : COLORADO STATE UNIV FORT COLLINS FLUID DYNAMICS AND DIFFUSION LAB

Personal Author(s) : Nayak,Shrinivas K. ; Sandborn,Virgil A.

Report Date : MAR 1973

Pagination or Media Count : 136

Abstract : Based on experimental and flow visualization studies, a model for directly opposed free and forced convection flow around a heated cylinder (0.01 mm diameter) was developed. Three modes of flow were identified. For velocities less than 15 cm/sec (cylinder Reynolds number = 0.08) a free convection or a buoyant force dominated flow was observed. For velocities greater than 15 cm/sec but less than 21.4 cm/sec the magnitudes of the forced and free convection flows were nearly equal. A periodic oscillation of the stagnation region was observed. For velocities greater than 21.4 cm/sec the forced convection was found to dominate over the free convection. The stagnation region was fixed for each flow velocity at one position above the cylinder. (Author Modified Abstract)

Descriptors :   (*NOZZLE GAS FLOW, *CONVECTION(HEAT TRANSFER)), CYLINDRICAL BODIES, PERIODIC VARIATIONS, FLOW VISUALIZATION, FLOW FIELDS, STAGNATION POINT, VELOCITY, MATHEMATICAL MODELS, OSCILLATION, ANEMOMETERS

Subject Categories : Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE