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77. = 2: 2.E, Laminar Flow in a Narrow Slit A viscous fluid is in laminar flow in a slit formed by two parallel walls a distance 2B apart. Make a differential momentum balance and obtain the expressions for the distribu- tions of momentum flux and velocity (see Fig. 2. E): o. (2.E-1) L (9-4) U, (2.E-2) 2,1L in which = p + pgh = p - pra. What is the ratio of average to maximum velocity in the slit? Obtain the analog of the Hagen-Poiseuille law for the slit. 2 (99,-)BW Answer: (02) = ju..mexi Q 3 AL (2). **[- () & criand Annualue Chemie Fluid in body L B! X=0 XzB Fluid out Fig. 2.E. Flow through a slic