Q.4 In an experimental setup, mineral oil is filled in between the narrow gap of two horizontal smooth plates. The setup has arrangements to maintain the plates at desired uniform temperatures. At these temperatures, ONLY the radiative heat flux is negligible. The thermal conductivity of the oil does not vary perceptibly in this temperature range. Consider four experiments at steady state under different experimental conditions, as shown in the figure Ql. The figure shows plate temperatures and the heat fluxes in the vertical direction. What is the steady state heat flux (in W m) with the top plate at 90°C and the bottom plate at 45°C? 30°C 70°C 40°C 90°C flux 39 Wm2 flux =30 Wm2 flux 52 Wm flux=? Wm %3D 60°C 35°C 80°C 45°C Experiment 1 Experment 2 Experiment 3 Experiment 4

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