Fluid Mechanics seventh edition by Frank M. White · Problem P6.17

Viscous Flow in Ducts — Frank M. White

Physics — Fluid Mechanics · laminar-pipe-flow

Problem

A capillary viscometer measures the time required for a specified volume

v

of liquid to flow through a small-bore glass tube, as in Fig. P6.17. This transit time is then correlated with fluid viscosity. For the system shown, (a) derive an approximate formula for the time required, assuming laminar flow with no entrance and exit losses. (b) If

L = 12

cm,

l = 2

cm,

v = 8

^3

, and the fluid is water at 20°C, what capillary diameter

D

will result in a transit time

t

of 6 seconds?

Browse the problem library