class 15 - External Flow: Flow over Cylinders Chapter 7...

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Unformatted text preview: External Flow: Flow over Cylinders Chapter 7 Section 7.4 During a cold winter day, wind at 15 m/s is blowing parallel to a 4-m-high and 10-m-long wall of a house. If the air outside is at 5C and the surface temperature of the wall is 12C, determine the rate of heat loss from that wall by convection. Assume the following Air properties: Kinematic viscosity = 1.5 x10-5 m 2 /s Thermal conductivity = 0.02 W/m-K Pr=1 Which form of the Nu correlation should be used: a) b) c) The Cylinder in Cross Flow Conditions depend on special features of boundary layer development, including onset at a stagnation point and separation , as well as transition to turbulence. Stagnation point : Location of zero velocity and maximum pressure . Followed by boundary layer development under a favorable pressure gradient and hence acceleration of the free stream flow As the rear of the cylinder is approached, the pressure must begin to increase. Hence, there is a minimum in the pressure distribution,...
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This note was uploaded on 08/13/2011 for the course CHEM 3210 taught by Professor Degrazia during the Fall '10 term at Colorado.

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class 15 - External Flow: Flow over Cylinders Chapter 7...

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