JP Journal of Heat and Mass Transfer
Volume 1, Issue 2, Pages 187 - 217
(June 2007)
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NUMERICAL ANALYSIS OF MIXED CONVECTION IN AIR IN A CONVERGENT VERTICAL CHANNEL WITH A MOVING PLATE
Assunta Andreozzi (Italy), Giovanni Lacasa (Italy) and Eugenia Rossi Di Schio (Italy)
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Abstract: A numerical investigation of mixed convection in air in a convergent vertical
channel due to the interaction between a buoyancy flow and a moving plate
induced flow is presented. The plate is adiabatic and moves
at a constant velocity in the channel mid-plane in the direction of the buoyancy
force whereas the principal inclined walls of the channel are heated at uniform
heat flux. The numerical analysis is carried out by
means of the finite volume method, using the Fluent commercial code. The effects of the channel spacing, the wall heat flux,
the moving plate velocity and the converging angle on the air streamlines and
temperature fields are investigated. For all analyzed heat fluxes streamlines
show that, when mere natural convection occurs, buoyancy forces draw upwards the
air in the channel. Moreover, downstream of the channel exit section the air
mass flow rate, leaving the channel, drags some air mass flow rate from the
surrounding ambient. When the adiabatic plate moves, air is dragged upwards not
only by buoyancy forces but also by the moving plate. The temperature fields
confirm the fluid dynamic behaviour in the analyzed system.
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Keywords and phrases: Navier-Stokes equations, free convection, heat and mass transfer, heat flow, finite volume methods. |
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