A thin flat plate measuring 280 mm x 600 mm at a temperature of 80C is...

 

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A thin flat plate measuring 280 mm x 600 mm at a temperature of 80°C is cooled on one face by air at 10°C flowing at 28 m/s parallel to the 600-mm edges of the plate. Its emissivity is 0.74 and it is placed in a large chamber with walls at 15°C. The other face is insulated. (a) (b) (c) (d) (e) Calculate the rate of convective heat transfer from the plate. Where, if anywhere, does the boundary layer on the plate become turbulent? [10] [2] Sketch and label a graph showing the variation of heat flux along the length of the plate. Sketch and label a diagram of the structure of the boundary layer. [4] Calculate the convective heat flux 200 mm downstream of the leading edge of the plate. [4] Calculate the radiant heat transfer from the plate to the chamber walls. [5] A thin flat plate measuring 280 mm x 600 mm at a temperature of 80°C is cooled on one face by air at 10°C flowing at 28 m/s parallel to the 600-mm edges of the plate. Its emissivity is 0.74 and it is placed in a large chamber with walls at 15°C. The other face is insulated. (a) (b) (c) (d) (e) Calculate the rate of convective heat transfer from the plate. Where, if anywhere, does the boundary layer on the plate become turbulent? [10] [2] Sketch and label a graph showing the variation of heat flux along the length of the plate. Sketch and label a diagram of the structure of the boundary layer. [4] Calculate the convective heat flux 200 mm downstream of the leading edge of the plate. [4] Calculate the radiant heat transfer from the plate to the chamber walls. [5] A thin flat plate measuring 280 mm x 600 mm at a temperature of 80°C is cooled on one face by air at 10°C flowing at 28 m/s parallel to the 600-mm edges of the plate. Its emissivity is 0.74 and it is placed in a large chamber with walls at 15°C. The other face is insulated. (a) (b) (c) (d) (e) Calculate the rate of convective heat transfer from the plate. Where, if anywhere, does the boundary layer on the plate become turbulent? [10] [2] Sketch and label a graph showing the variation of heat flux along the length of the plate. Sketch and label a diagram of the structure of the boundary layer. [4] Calculate the convective heat flux 200 mm downstream of the leading edge of the plate. [4] Calculate the radiant heat transfer from the plate to the chamber walls. [5] A thin flat plate measuring 280 mm x 600 mm at a temperature of 80°C is cooled on one face by air at 10°C flowing at 28 m/s parallel to the 600-mm edges of the plate. Its emissivity is 0.74 and it is placed in a large chamber with walls at 15°C. The other face is insulated. (a) (b) (c) (d) (e) Calculate the rate of convective heat transfer from the plate. Where, if anywhere, does the boundary layer on the plate become turbulent? [10] [2] Sketch and label a graph showing the variation of heat flux along the length of the plate. Sketch and label a diagram of the structure of the boundary layer. [4] Calculate the convective heat flux 200 mm downstream of the leading edge of the plate. [4] Calculate the radiant heat transfer from the plate to the chamber walls. [5]