Cooling analysis of aluminum extrusion (forced convection, transient conduction): determine the minimum time required for an aluminum extrusion to cool to a maximum internal temperature of 40 °c. the extrusion has a square cross section of 4 cm x 4 cm and exits the extruder at a uniform temperature of 150 °c. 20 °c air can be directed towards the extrusion at a velocity of 15 m/s.

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The drive force for diffusion is 7 fick's first law can be used to solve the non-steady state diffusion. a)-true b)-false

An ideal otto cycle with air as the working fluid has a compression ratio of 8. the minimum and maximum temperatures in the cycle are 300 k and 1340 k. use constant specific heats at room temperature to determine (a) the amount of heat transferred to the air during the heat- addition kj/kg, (b) the thermal efficiency, and (c) the thermal efficiency of a carnot cycle ope limits. process, in rating between the same temperature