Accession Number : AD0685176

Title :   AN EXPERIMENTAL INVESTIGATION OF NATURAL CONVECTION IN A HORIZONTAL CYLINDER,

Corporate Author : CASE WESTERN RESERVE UNIV CLEVELAND OHIO DIV OF FLUID THERMAL AND AEROSPACE SCIENCES

Personal Author(s) : Brooks,Irving H. ; Ostrach,Simon

Report Date : JAN 1969

Pagination or Media Count : 68

Abstract : The study deals with an experimental investigation into the natural convection inside a horizontal cylinder. The fluid, geometry, and thermal boundary condition were chosen so as to have a high Prandtl number and unit order Grashof number. The thermal boundary condition was established by imposing temperatures at two points, 180 degrees apart, on the circumference of the cylinder. The resulting boundary condition for the full 360 degrees was found experimentally and is presented. The apparatus was constructed so that the entire cylinder could be rotated. This was done so that the diameter containing the two imposed temperatures could vary from being horizontal to being vertical. In this way an arbitrary heating angle was incorporated into the boundary condition. Temperature profiles and streamline patterns were observed at steady state for various values of this heating angle and for various initial conditions. For some cases, velocity profiles were also plotted. It was found that the interior 'core' of fluid was thermally stratified when the diameter containing the two imposed temperatures was horizontal. The flow occurred primarily in the region close to the cylinder wall. The cylinder was rotated so that the diameter containing the two imposed temperatures made an angle with the horizontal. (Author)

Descriptors :   (*FLUIDS, HEAT TRANSFER), BOUNDARY LAYER, VELOCITY, GEOMETRY, ROTATION, TEMPERATURE, PHOTOGRAPHIC EQUIPMENT, CAMERAS, THERMOCOUPLES, GRAPHICS

Subject Categories : Fluid Mechanics
      Thermodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE