Buoyancy effects on conjugate heat transfer due to a laminar impinging jet: Preliminary results

Conference · Thu Jul 01 04:00:00 EDT 1999

OSTI ID:20034221

Altieri, G; De Luca, V; Ruocco, G

A numerical analysis for fluid flow and conjugate conduction/convection heat transfer from a laminar, planar gas jet impingement (JI) on a finite thickness, discretely heated substrate is performed, which includes the effect of buoyancy. The competition between transfer of heat by conduction in the plate and by convection in the fluid is examined. A combination of assisting or opposing mixed convection is modeled, and the related flow field as well as local heat transfer rate is studied as a function of the mixed convection parameter, the Richardson number, for a given geometry and a thermal-fluid base-case. Preliminary evaluations of the heat transfer rate are presented as local Nusselt number distributions, for nonbuoyant, assisted and opposed impinging jets, along the impinged substrate. The complex, non-monotonic progresses of these results justify the inclusion of the conduction mechanism in the substrate, in order to correctly quantify the driving parameters for the heat transfer control. The presented calculations are in fair accordance with existing literature which is limited to pure fluid jet impingement. The inclusion of the conduction mechanism confirms the absence of the conjugate effect when an opposing cooling jet configuration is realized.

• Research Organization: Univ. degli Studi della Basilicata, Potenza (IT)
• OSTI ID: 20034221
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
FLUID FLOW
FORCED CONVECTION
GAS FLOW
IMPINGEMENT
JETS
LAMINAR FLOW
NATURAL CONVECTION
NUMERICAL ANALYSIS
THERMAL CONDUCTION