7-7. Using the methodology developed in the text for a circular pipe, develop the fully developed mean velocity profile and fully developed friction coefficient for the flow between parallel planes. Compare your friction result with Fig. 7-4 and Fig. 7-5. 7.8 Rangat Prob 7x7 for an annulus with radius ratio r. Compare your velocity- Convective Heat and Mass Transfer 25.0 24.0 23.0 130 22.0 TOO a= 5.0 2.0 a = a = 1.0 21.0 20.0 (c; Re). 19.0 18.0 17.0 16.0 15.0 14.0 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 -18 Figure 7-4 Friction coefficients for fully developed laminar flow in rectangular tubes. where the "hydraulic radius" 11 HTD 25 22 22 CHAPTER 7 Laminar Internal Flows: Momentumn Transfer УЯТИЯ ЭТМАЙУЦОЯТҮН Я (81-5) (cf Re) -qu 21 21 20 20 19 dov molinu lyn bod get ano 17 auds bas 18 at at baun no 160 bozessed T 15 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 Figure 7-5 Friction coefficients for fully developed laminar flow in circular-tube annuli.