Answered: Engine oil flows through a 50 mm…

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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Question

Engine oil flows through a 50 mm diameter tube at an average temperature of
147°C. The flow velocity is 80 cm/s. Calculate the average heat transfer coefficient if the tube wall is maintained at a temperature of 200°C and it is 2 m long. Hint: Area can be assumed to be equal to the vertical projectiion of the tube , i.e. LD. Ans.: h = 377.36 W/m2.K . Draw an illustration.

Note: use the formula on the picture

Convection
O Newton's Law of Cooling
Q = hA(Ts – Tf)
Where:
Q = heat transfer per unit time, J/s or W
%3D
h = convection heat transfer coefficient, W/m.K
A = heat transfer area, m2
T = surface temperature
Tf = bulk fluid temperature
%3D

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