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Abstract
Transient two dimensional and three-dimensional natural convection and two-dimensional steady state mixed convection in rectangular enclosures with a partially heated vertical wall have been numerically studied. The two-dimensional differentially heated side wall problem with the temperature of the hot wall varying linearly with time has also been studied numerically as well as being studied experimentally. The numerical studies have assumed that the flow is laminar and that the fluid properties are constant except for the density change with temperature which gives rise to the buoyancy forces. Results have been obtained for a Prandtl number of 0.7.
The transient natural convective flow within a rectangular enclosure following a sudden temperature change of a rectangular portion of one vertical wall and the heat transfer from this wall portion has been considered. The uniformly heated wall portion(s) or element(s) is(are) on an otherwise insulated vertical wall. The opposite wall is held at the initial wall temperature and all other wall surfaces are assumed to be adiabatic. The two-dimensional analysis of this problem assumes that the enclosure and the heated element are of infinite width, while the three-dimensional analysis assumes that the enclosure has adiabatic end walls and the element(s) is(are) of finite width.
Steady state laminar mixed forced and free convective heat transfer through a cavity which has a portion of one vertical wall heated and the other vertical wall cooled and the remaining wall portions adiabatic has been considered numerically. The cooling fluid enters and leaves through separate openings in the cold wall.
The transient natural convective flow and heat transfer in a rectangular enclosure resulting when the temperature of one vertical wall suddenly starts to increase linearly with time has been considered numerically and experimentally. It has been assumed in the numerical study that the fluid is initially at a uniform temperature and motionless. Then, at time zero, the temperature of one vertical wall starts to increase linearly with time until a final steady state is reached. The opposite vertical wall is kept at the initial fluid temperature and the horizontal wall surfaces are assumed perfectly insulated.
