Accession Number : ADP008998

Title :   The Onset to Turbulence in a Buoyancy-Driven Cubical Enclosure Using a LDA Measuring System,

Corporate Author : DELFT UNIV OF TECHNOLOGY (NETHERLANDS)

Personal Author(s) : Opstelten, I. J. ; Piereij, J. P. ; Janssen, R. J. ; Henkes, R. A.

Report Date : 23 JUL 1992

Pagination or Media Count : 6

Abstract : The transition from a laminar natural-convection flow to a turbulent flow is studied both experimentally and numerically for air in a cubical enclosure. Special effort was taken in the experimental configuration to make the boundary conditions resemble those of a side-heated adiabatic cubical enclosure. It is shown that radiation between the walls, conduction in the horizontal walls and heat losses to the environment have a significant influence on the temperature at the horizontal walls and consequently on the transition of the flow. Temperatures and velocities were measured with a thermo-resistance probe and an 1-D LDA system. (Author)

Descriptors :   *LASER ANEMOMETERS, *TURBULENCE, CONVECTION, FLOW FIELDS, BOUNDARY LAYER, PROBES, DOPPLER EFFECT, NETHERLANDS.

Subject Categories : Fluid Mechanics
      Optical Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE