Question: Friction factor for flow past an infinite cylinder, the flow past a long cylinder is very different from the flow past a sphere, and the

Friction factor for flow past an infinite cylinder, the flow past a long cylinder is very different from the flow past a sphere, and the method introduced in S4.2 can-not be used to describe this system. It is found that, when the fluid approaches with a velocity v_∞, the kinetic force acting on a length L of the cylinder is The Reynolds number is defined here as Re = Dv_∞p/µ. Equation 6B.9-1 is valid only up to about Re = 1. In this range of Re, what is the formula for the friction factor as a function of the Reynolds number?

4,L In (7.4/Re) F=

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