Abstract:
Flow in a rectangular enclosure with an uniform heat flux applied across the vertical
sidewall and with the opposite vertical surface cooled to a uniform low temperature has
been numerically studied. Computations has also been carried out for investigating the
heat tral1sfer and now pattern inside that enclosure with uniform heat nux applied at the
lower horizontal wall with the opposite horizontal surface cooled to isothermal low
temperature. The remaining walls are kept adiabatic. In the numerical analysis the
integral form of the governing equations are discretized to algebraic equations by using
control volume based finite volume method with a body fitted grid. Monotone advection '.
and reconstruction scheme and conjugate gradient scheme are used to solve the algebraic
equations. The pressure-velocity coupling is achieved by Semi implicit pressure linked
equation algorithm. Investigations are carricd out for fluid at Rayleigh number 103 to
Rayleigh number 106 It has been assumed that the now is laminar. Boussinesq
Approximation is used i.e. it is assumed that the fluid properties are constant except for
the density range with temperature which gives rise to the buoyancy force.
Investigations are carried out for different size of the enclosure (different aspect ratio)
and different size of heated strip applied to the wall. Flow patterns in terms of velocity
vector, Horizontal velocity, Vertical velocity, Isotherms, Temperature distribution and
Nusselt Number distribution are used to analyze the result obtained. Effect of Rayleigh
number and size of the heated strip on the horizontal and vertical velocity also predicted.
