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S15 Métodos Híbridos em Engenharia Mecânica |
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Title:
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HYBRID APPROACH FOR FULLY TRANSIENT TURBULENT FORCED CONVECTION INSIDE SMOOTH PARALLEL-PLATE CHANNELS
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Summary :
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ABSTRACT. TRANSIENT TURBULENT FORCED CONVECTION OF NEWTONIAN FLUIDS WITHIN PARALLEL-PLATES CHANNELS SUBJECTED TO THIRD KIND BOUNDARY CONDITIONS AND PERIODIC VARIATION OF INLET TEMPERATURE IS CONSIDERED. THE WELL-ESTABLISHED CEBECI-SMITH S TURBULENCE MODEL IS USED IN CONJUNCTION WITH TURBULENT PRANDTL NUMBER MODELS, VALID FOR A WIDE MOLECULAR PRANDTL NUMBER RANGE FOR THE CLOSURE OF THE FORCED CONVECTION FORMULATION. A HYBRID APPROACH IS EMPLOYED TO HANDLE A CLASS OF PARABOLIC-HYPERBOLIC PROBLEM, THAT APPEARS IN CONNECTION WITH TRANSIENT FORCED CONVECTION IN CHANNELS. A INTEGRAL TRANSFORMATION PROCESS ELIMINATES THE INDEPENDENT VARIABLES IN WHICH THE DIFFUSION PHENOMENA OCCURS, WHILE THE RESULTING SYSTEM OF COUPLED HYPERBOLIC EQUATIONS IS SOLVED BY A SECOND-ORDER EXPLICIT FINITE-DIFFERENCE SCHEME. RESULTS ARE PRESENTED FOR AVERAGE FLUID TEMPERATURE AND WALL HEAT FLUX OVER A WIDE RANGE OF THE DIMENSIONLESS AXIAL COORDINATE.
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Author :
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Cotta, Renato M.
Pimentel, Luiz C.G.
Santana, Luiz F.M.
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Paper View :
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