Solve correctly maximum number of questions. Cold air at atmospheric pressure and 0°Centers a 120-m long duct of elliptical crosssection (a - 0.8-m, b = 0.2-m) that passesthrough the attic of a factory at a rate ofa rate o0.012 m/s. The duct is equipped with aelectric resistance heater that providesuniform heating throughout the surface ofthe duct at a rate 95o W. Determine thecorresponding values:(for air, use k = 0.032 W/m K, Pr = 0.7, u =2.19 x 10-5 Pa.s, us = 2.01 x 10-5 Pa.s, cp = 1011J/kg K, p = 0.946 kg/m")Perimeter se 3(a + b) – (3a + 6)(a + 36)|Area - abra- Reynolds number R,=b- Entry length L, =c- Nusselt number, Nu =d- Convection heat transfer coefficient, h=W/m2Ke- Exit temperature of the fluid, T, =*CSurface temperature of the duct at theexit Te"C

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Answered: a- Reynolds number R,- b- Entry length…

Engineering

Mechanical Engineering

a- Reynolds number R,- b- Entry length L,- c- Nusselt number, Nu =

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

Solve correctly maximum number of questions.

Cold air at atmospheric pressure and 0°C
enters a 120-m long duct of elliptical cross
section (a - 0.8-m, b = 0.2-m) that passes
through the attic of a factory at a rate of
a rate o
0.012 m/s. The duct is equipped with a
electric resistance heater that provides
uniform heating throughout the surface of
the duct at a rate 95o W. Determine the
corresponding values:
(for air, use k = 0.032 W/m K, Pr = 0.7, u =
2.19 x 10-5 Pa.s, us = 2.01 x 10-5 Pa.s, cp = 1011
J/kg K, p = 0.946 kg/m")
Perimeter se 3(a + b) – (3a + 6)(a + 36)|
Area - abr
a- Reynolds number R,=
b- Entry length L, =
c- Nusselt number, Nu =
d- Convection heat transfer coefficient, h=
W/m2K
e- Exit temperature of the fluid, T, =
*C
Surface temperature of the duct at the
exit Te
"C

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