Abo Bibliothek: Guest

ISSN Online: 2377-424X

ISBN Print: 0-89116-909-1

International Heat Transfer Conference 9
August, 19-24, 1990 , Jerusalem, Israel

EXPERIMENTAL AND NUMERICAL MODELLING OF COMBINED FORCED AND FREE CONVECTION IN A COMPLEX GEOMETRY WITH INTERNAL HEAT GENERATION

Get access (open in a dialog) DOI: 10.1615/IHTC9.2620
pages 327-332

Abstrakt

An experimental and numerical investigation of the flow of water injected into a cylindrical vessel containing an array of heated tubes was conducted. Two distinct flow patterns were observed, depending on the ratio of heat load to flow rate: a buoyancy-dominated (free convection) pattern, and a momentum-dominated (forced convection) pattern. For conditions of most interest, the latter pattern was strongly asymmetric, despite intended symmetry in the geometry, the heat load distribution and the inlet flow rates. A symmetric momentum-dominated flow pattern could be enforced by inserting a wall along the vertical centerline of the test vessel. This resulted in a more efficient cooling of the vessel interior, producing significantly lower average and peak temperatures in the vessel.
Numerical simulations of the tests using a finite-volume computer code (MODTURC-CLAS) yielded predictions in very good qualitative and quantitative agreement with these observations and measurements.