Answered: At Tw= 100oC uniform temperature, L=…

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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At Tw= 100oC uniform temperature, L= 26m long, D=2.3cm diameter pipe passes motor oil at =3 kg/s flow rate and Ti = 40oC temperature. The flow is hydrodynamically developed and the average Nusselt number is Num=7.5. Accordingly; Find a) the average heat transfer coefficient, b) the outlet temperature of the engine oil, c) the total amount of heat transfer transferred to the oil, and d) the thermal inlet length. (Variables: L= 20-40m, =2-4 kg/s, D=1.5-3 cm)

D=2.5cm I 100°C
T;=?
40c: fo876 kg/m, ç= 1964J/kg.c, 9= 2.4xl0 m/s,
k= 0.144 w/m.c, Pr= 2870.
-4
T;= 40°C
L= 40m
m=3 kg/s

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