Answered: The lower surface of a flat Teflon…

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

The lower surface of a flat Teflon plate (k=0.35 W/(m.K),ρ=2200 kg/m3 and cp=1500 J/(kg.K) with 2 m long and 60 mm thick is heated by radiation from infrared lamps that emit a constant flux over this surface, while its opposite surface exchanges heat by convection with an air stream at 15^oC flowing parallel to its length, with speed of 15 m/s. The temperature of surface 1 (T1) is maintained at 60^oC by lamp irradiation and surface temperature 2 (T2) is not known. Under steady-state conditions for heat transfer, it is requested:

(a) Estimate the film coefficient for convection heat exchange (consider the free current temperature to estimate the physical properties);
(b) Estimate the temperature T2 and the heat flux provided by the
heating lamps

Table below about the physical properties of air at 1 atm

T
Cp
k
Pr
|(kg/m³) (kg/m.s) (J/kg. K) (W/m.K)
1,395 159,6x10-7
(K)
250
1006
0,022 | 0,720
1,161 | 184,6x10-7
0,995 208,2x10-7
300
1007
0,026
0,707
350
1009
0,030
0,700
400
0,871 230,1x10-7
1014
0,034
0,690
450
0,774 250,7x10-7
1021
0,037
0,686

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