Air at 10 m/s and 15 C is used to cool a square hot molded
Chapter , Problem 7.103(choose chapter or problem)
Air at 10 m/s and 15 C is used to cool a square hot molded plastic plate 0.5 m to a side having a surface temperature of 140 C. To increase the throughput of the production process, it is proposed to cool the plate using an array of slotted nozzles with width and pitch of 4 mm and 56 mm, respectively, and a nozzle-toplate separation of 40 mm. The air exits the nozzle at a temperature of 15 C and a velocity of 10 m/s. (a) Determine the improvement in cooling rate that can be achieved using the slotted nozzle arrangement in lieu of turbulated air at 10 m/s and 15 C in parallel flow over the plate. (b) Would the heat rates for both arrangements change significantly if the air velocities were increased by a factor of 2? (c) What is the air mass rate requirement for the slotted nozzle arrangement?
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