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

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

Elements Of Electromagnetics
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
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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
Transcribed Image Text: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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