Card 31 / 35: Calculate the Reynolds number for water flowing through a 1.5" diameter pipe at 4.5 gallons per minute.
A) 1500
B) 2500
C) 6500
D) 9500
E) 10500

Answer:
D) 9500

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Explanation:

This calculation requires knowing the definition of the Reynolds number,which equals rho v D / mu. Try to memorize this equation for the Reynolds number. It may also help to review how to convert from flow rate to velocity and from one unit system to another. You need not memorize unit conversion factors; you may look them up. At this point, certain units in a system and the magnitude of certain quantities in a system should be more familiar after repeated use. For example, for the present calculation, many people may remember that the viscosity of water = mu = 1 cP. Other terms are rho = 1 g/cm³, v = 24.9 cm/s, and D = 1.5*2.54 cm.

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Thermal-Fluid Systems ME303

Author:

Dr.Steve GibbsProfessor

The Saylor Foundation

USA

Access: Public Instant Grading

Attribution: Dr. Steve Gibbs. Thermal-Fluid Systems. The Saylor Academy 2014, http://www.saylor.org/courses/me303/

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