Thermodynamics HW Solutions 539

Thermodynamics HW Solutions 539 - Chapter 7 External Forced...

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Unformatted text preview: Chapter 7 External Forced Convection Chapter 7 EXTERNAL FORCED CONVECTION Drag Force and Heat Transfer in External Flow 7-1C The velocity of the fluid relative to the immersed solid body sufficiently far away from a body is called the free-stream velocity , V ∞ . The upstream (or approach ) velocity V is the velocity of the approaching fluid far ahead of the body. These two velocities are equal if the flow is uniform and the body is small relative to the scale of the free-stream flow. 7-2C A body is said to be streamlined if a conscious effort is made to align its shape with the anticipated streamlines in the flow. Otherwise, a body tends to block the flow, and is said to be blunt . A tennis ball is a blunt body (unless the velocity is very low and we have “creeping flow”). 7-3C The force a flowing fluid exerts on a body in the flow direction is called drag . Drag is caused by friction between the fluid and the solid surface, and the pressure difference between the front and back of...
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