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KNOWN: Thicknesses of three materials which form a composite wall and thermal conductivities of two of the materials. Inner and outer surface temperatures of the composite; also, temperature and convection coefficient associated with adjoining gas. FIND: Value of unknown thermal conductivity, kg. SCHEMATIC: LA = 0.3m Ts,o=20°C Ts,i=600°C- Too = 800°C h=25W/m2.K KA LB = LC = 0.15m KA=20W/m-K kc=50W/m-K KB kc To LA LB LC LA 'LB Lc' hA KAA kA KA ASSUMPTIONS: (1) Steady-state conditions, (2) One-dimensional conduction, (3) Constant properties, (4) Negligible contact resistance, (5) Negligible radiation effects.

KNOWN: Thicknesses of three materials which form a composite wall and thermal conductivities of two of the materials. Inner and outer surface temperatures of the composite; also, temperature and convection coefficient associated with adjoining gas. FIND: Value of unknown thermal conductivity, kg. SCHEMATIC: LA = 0.3m Ts,o=20°C Ts,i=600°C- Too = 800°C h=25W/m2.K KA LB = LC = 0.15m KA=20W/m-K kc=50W/m-K KB kc To LA LB LC LA 'LB Lc' hA KAA kA KA ASSUMPTIONS: (1) Steady-state conditions, (2) One-dimensional conduction, (3) Constant properties, (4) Negligible contact resistance, (5) Negligible radiation effects.

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
Problem 1.1MA
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KNOWN: Thicknesses of three materials which form a composite wall and thermal conductivities of two of the materials. Inner and outer surface temperatures of the composite; also, temperature and convection coefficient associated with adjoining gas. FIND: Value of unknown thermal conductivity, kg. SCHEMATIC: LA = 0.3m Ts,o=20°C Ts,i=600°C- Too = 800°C h=25W/m2.K KA LB = LC = 0.15m KA=20W/m-K kc=50W/m-K KB kc To LA LB LC LA 'LB Lc' hA KAA kA KA ASSUMPTIONS: (1) Steady-state conditions, (2) One-dimensional conduction, (3) Constant properties, (4) Negligible contact resistance, (5) Negligible radiation effects.
Transcribed Image Text:KNOWN: Thicknesses of three materials which form a composite wall and thermal conductivities of two of the materials. Inner and outer surface temperatures of the composite; also, temperature and convection coefficient associated with adjoining gas. FIND: Value of unknown thermal conductivity, kg. SCHEMATIC: LA = 0.3m Ts,o=20°C Ts,i=600°C- Too = 800°C h=25W/m2.K KA LB = LC = 0.15m KA=20W/m-K kc=50W/m-K KB kc To LA LB LC LA 'LB Lc' hA KAA kA KA ASSUMPTIONS: (1) Steady-state conditions, (2) One-dimensional conduction, (3) Constant properties, (4) Negligible contact resistance, (5) Negligible radiation effects.
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