One type of viscometer is simply a long capillary tube. A commercial device is shown in
Chapter 1, Problem p1.44(choose chapter or problem)
One type of viscometer is simply a long capillary tube. A commercial device is shown in Prob. C1.10. One measures the volume fl ow rate Q and the pressure drop Dp and, of course, the radius and length of the tube. The theoretical formula, which will be discussed in Chap. 6, is p < 8QL/(R4 ) . For a capillary of diameter 4 mm and length 10 inches, the test fl uid fl ows at 0.9 m 3 /h when the pressure drop is 58 lbf/in 2 . Find the predicted viscosity in kg/m s.
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