A Numerical Study Of Three Dimensional Laminar National Convection In A Vented Enclosure
E. Yu and Y. Joshi
A three dimensional numerical investigation of steady laminar natural
convection in vented enclosures is carried out. A discrete flush-type
heat source mounted on the substrate is used to simulate an electronic
component. Four different vent locations are investigated.
Combined natural convection in the air and conduction in the heat source,
the substrate and the enclosure walls are solved for. Solutions are
obtained for Rayleigh numbers ranging from 10 (4) to 10 (6), different
substrate thermal conductivity ratios and varied vent sizes. The
calculation domain is extended beyond the cubic enclosure in x, y and z
directions. Appropriate boundary conditions are prescribed on the
extended computational domain. The resulting flow and temperature
patterns are discussed. Also, the local and overall heat transfer
and the substrate, in terms of Nusselt numbers and the surface temperatures,
are presented to illustrate the vent effects.