Answered: Figure 9.14 shows a heat exchanger in…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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can you please find solution for the question 9.20?

Transcribed Image Text:S ing Eg (94)compute the ratio of the average velocity to the maximum velocity of flow for the flow of a liquid through a concrete pipe with an inside diameter of 8.00 in with Revnolds numbers of 400o, 10, 10', and 10. 16 Using Eq (9-3), compute several points on the velocity profile for the flow of 400 gal/min of water at 50 F in a dean, 4-in Schedule 40 steel pipe. Make a plot simi- ratio of the volume flow rate in the shell to that in the tube if the average velocity of flow is to be the same in each. 9.20 Figure 9.14 shows a heat exchanger in which each of two DN 150 Schedule 40 pipes carries 450 L/min of water. The pipes are inside a rectangular duct whose inside dimen- sions are 200 mm by 400 mm, Compute the velocity of flow in the pipes. Then, compute the required volume flow rate of water in the duct to obtain the same average velocity. ribel the po rabe de t of the the a new lar to Fig 9.7 with a fairly large scale. 17 Repest Problem 9.16 for the same conditions, except that the inside of the pipe is roughened by age so that 50 x 10. Plot the results on the same graph as 9.21 Figure 9.15 shows the cross section of a shell-and-tube heat exchanger. Compute the volume flow rate required in each small pipe and in the shell to obtain an average velocity of flow of 25 ft/s in all parts. e that used for the results of Problem 9.16, I8 For both situations described in Problems 9.16 and 9,17, compute the pressure drop that would occur over a dis- tance of 250 ft of horizontal pipe. Noncircular Cross Sections-Reynolds Number 9.22 Air with a specific weight of 12.5 N/m' and a dynamic viscosity of 2.0 x 10 Pars flows through the shaded portion of the duct shown in Fig. 9.16 at the rate of 150 m/h. Calculate the Reynolds number of the flow. Noncircular Sections-Average Velocity 9.19 A shell-and-tube heat exchanger is made of two standard steel tubes, as shown in Fig. 9.13. The outer tube has an OD of 7/8 in and the OD for the inner tube is in. Each tube has a wall thickness of 0.049 in. Calculate the required DN 150 Schedule 40 pipes FIGURE 9.14 Problems 9.20, 9.26, and 9.39. 200 mm 400 mm

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