ISSN Online: 2377-424X
ISBN Print: 0-89116-909-1
International Heat Transfer Conference 9
EXPERIMENTAL AND NUMERICAL MODELLING OF COMBINED FORCED AND FREE CONVECTION IN A COMPLEX GEOMETRY WITH INTERNAL HEAT GENERATION
要約
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.
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.