hw5-010

# hw5-010 - D E P A R T M E N T O F C H E M IC A L E N G IN E...

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DEPARTMENT OF CHEMICAL ENGINEERING UNIVERSITY OF CALIFORNIA, SANTA BARBARA ChE120B Introduction to Heat Transfer Processes Winter 2010 Out Wednesday, February 24 Due: Wednesday, March 3, 2010 1. A plane wall is initially at temperature T 0 . At time t=0, t he temperature on the left side of the wall is changed and then held constant at a temperature T 1 . Determine the time evolution of the temperature recognizing that there is a steady state solution that you are quite familiar with. 2. (from last quarter) Air at 72 F and 1 atm (v = 0.16 cm 2 /sec) flows past a flat plate with a uniform free stream velocity of 3 ft/sec. What is the boundary layer thickness at a point 5 inches from the leading edge? If the plate is 8 ft long and 3 ft wide, what is the drag force on one side of the plate? 3. Sometimes viscous dissipation of heat is important. Consider two large plates separated by a 2 mm thick oil film. The upper plate moves with a constant velocity of 12 m/s, while the lower plate is stationary. Both plates are maintained at 20 C. Take the oil to have k = .145 W/m-K and

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hw5-010 - D E P A R T M E N T O F C H E M IC A L E N G IN E...

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