Abstract:
An experimental investigation was carried out to determine the heat transfer coefficient
from a rectangular tilted cavity to the ambient due to the buoyancy driven flow in the
cavity. The cavity is partially open from one side. All the walls ofthe cavity are adiabatic
except the wall facing the cavity opening which is heated at a constant heat flux. Three
different geometrical arrangements for the opening were investigated: (I) high wall slit,
(2) low wall slit and (3) uniform wall slots. Each opening arrangement was studied at
opening ratios of 0.25, 0.50, and 0.75. The average heat transfer coefficient between the
cavity and the sUrrounding air was estimated for each geometrical arrangement for various
tilt angles of the cavity, measured from the vertical direction, ranging from -90 deg to +90
deg with increments of 15 deg. The results are presented in tenns of the average Nusselt
number for different values of the above experimental parameters. Conclusions are
derived for the effect of changing the tilt angle or the opening ratio of the cavity on the
average heat transfer coefficient between the cavity and the ambient air.
