Quantitative relations between transfer processes

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Dehumidification of air (Fig. 19.4-1) for the system of Example 19.4-1 let the vapor is H20 and the stagnant gas is air. Assume the following conditions (which are representative in air conditioning): (i) at z = d, T = 80°F and xH2O = 0.018; (ii) at z = 0, T = 50°F. (a) For p = 1atm, ca...
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Entrance flow in conduits (a) Estimate the entrance length for laminar flow in a circular tube. Assume that the boundary-layer thickness S is given adequately by Eq. 4.4-17, with v8 of the flat-plate problem corresponding to vmax in the tube-flow problem. Assume further that the entrance ...
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Forced convection from a sphere in creeping flow, a sphere of diameter D, whose surface is maintained at a temperature T0, is located in a fluid stream approaching with a velocity v8 and temperature T = o. The flow around the sphere is in the "creeping flow" regime--that is, with the Reyno...
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Friction factor for a rotating disk, a thin circular disk of radius R is immersed in a large body of fluid with density p and viscosity µ. If a torque Tz is required to make the disk rotate at an angular velocity 12, then a friction factor f may be defined analogously to Eq. 6.1-1 as foll...
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Heat conduction with temperature-dependent thermal conductivity (Fig. 10B.12) the curved surfaces and the end surfaces (both shaded in the figure) of the solid in the shape of a half-cylindrical shell are insulated. The surface ? = p, of area (r2 – r1) L, is maintained at temperat...
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Inadequacy of mean hydraulic radius for laminar flow(a) For laminar flow in an annulus with radii kR and Rr use Eqs. 6.2-17 and 18 to get an expression for the average velocity in terms of the pressure difference analogous to the exact expression given in Eq. 2.4-16. (b) What is the percen...
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Numerical demonstration of the von Karman momentum balance (a) Evaluate the integrals in Eq. 4.4-13 numerically for the Blasius velocity profile given in Fig. 4.4-3. (b) Use the results of (a) to determine the magnitude of the wall shear stress tyx|y = 0. (c) Calculate the total drag forc...
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Power law flow in a narrow slit, in Example 8.3-2 show how to derive the velocity distribution for the region – < x="">< 0,="" is="" it="" possible="" to="" combine="" this="" result="" with="" that="" in="" eq.="" 8.3-13="" into="" one="" equation?=""> ...
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Fresh halibut livers containing 25.7% oil are to be extracted with pure ethyl ether to remove 95% of the oil in a counter current multistage leaching process. The feed rate is 1000 kg of fresh livers per hour. The final exit overflow solution is to contain 70wt% oil. The retention of solution by ine...
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Transpiration cooling in a planar system, two large flat porous horizontal plates is separated by a relatively small distance L. The upper plate at y = L is at temperature TL, and the lower one at y = 0 is to be maintained at a lower temperature T0. To reduce the amount of heat that must b...

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