TED-AJ03-224 LAMINAR HEAT TRANSFER WITH VISCOUS DISSIPATION AND FLUID AXIAL HEAT CONDUCTION FOR MODIFIED POWER LAW FLUIDS FLOWING IN PARALLEL PLATES WITH ONE PLATE MOVING

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Using the fully developed laminar velocity distributions obtained by applying the modified power-law model proposed by Irvine and Karni, the thermal-entrance-region heat transfer of non-Newtonian fluids flowing in parallel plates with one plate moving is investigated taking into account both viscous dissipation and fluid axial heat conduction for two kinds of thermal boundary conditions of constant temperature and constant heat flux at the moving wall. The energy equation together with a constant temperature at upstream infinity, fully developed temperature profile at downstream infinity and the appropriate thermal boundary conditions at the upper and lower walls is numerically solved by the finite difference method as an elliptic type problem. The effects of the moving plate velocity (as U^*), rheological property (flow index, n), Brinkman number (Br) and Peclet number (Pe) on the temperature [figure] distribution and Nusselt numbers are discussed. It is observed that the fluid temperature near the moving plate is strongly affected by the velocity profile deformed due to the moving plate and that the Nusselt number at the moving plate wall shows complicate behavior as functions of Br and Pe in the thermal entrance region. With the case of non-Newtonian fluid (n=0.5 and β=1) and a moving lower plate (U^*=1), Nusselt numbers at the heated wall are shown in Fig. A-1 and Fig. A-2 for the two cases of thermal boundary conditions. The curves of Nusselt number are flattened out throughout the axial ordinate (z^*) with a decrease in Pe due to the fluid axial heat conduction from downstream to upstream, as shown in these figures. The effect of viscous dissipation is clearly seen for the case of constant wall heat flux condition, as shown in Fig. A-2. [figure]
社団法人日本機械学会の論文

TED-AJ03-224 LAMINAR HEAT TRANSFER WITH VISCOUS DISSIPATION AND FLUID AXIAL HEAT CONDUCTION FOR MODIFIED POWER LAW FLUIDS FLOWING IN PARALLEL PLATES WITH ONE PLATE MOVING

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