2. (Spts) Which one of the statement is not correct to estimate the entrance len

ID: 2074746 • Letter: 2

Question

2. (Spts) Which one of the statement is not correct to estimate the entrance length Le in pipe flow: a) Measuring the distance from the entrance to the location where the pressure gradient is unchanged b) Using the empirical formula Le=.06"Re"D when Re, the flow Reynolds number, is less than 2400 and D is the pipe diameter c) Using the empirical formula Le-4.4 Re6 D when Re, the flow Reynolds number, greater than 2300 and D is the pipe diameter d) Measure the difference in the pressures at entrance and exit