In regions far from the entrance, fluid flow througha circular pipe is one dimensional, and the velocity profile forlaminar flow is given by u(r) = umax(1 - r 2/R2), where R isthe radius of the pipe, r is the radial distance from the center ofthe pipe, and umax is the maximum flow velocity, which occursat the center. Obtain (a) a relation for the drag force applied bythe fluid on a section of the pipe of length L and (b) the valueof the drag force for water flow at 20°C with R 5 0.08 m,L = 30 m, umax = 3 m/s, and m = 0.0010 kg/m?s.

College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
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In regions far from the entrance, fluid flow through
a circular pipe is one dimensional, and the velocity profile for
laminar flow is given by u(r) = umax(1 - r 2/R2), where R is
the radius of the pipe, r is the radial distance from the center of
the pipe, and umax is the maximum flow velocity, which occurs
at the center. Obtain (a) a relation for the drag force applied by
the fluid on a section of the pipe of length L and (b) the value
of the drag force for water flow at 20°C with R 5 0.08 m,
L = 30 m, umax = 3 m/s, and m = 0.0010 kg/m?s.

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