GATE ME 2014 Set 3 — Question 54
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Heat Transfer → Conduction → Composite Wall Conduction
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Question
Heat transfer through a composite wall is shown in figure. Both the sections of the wall have equal thickness (). The conductivity of one section is and that of the other is . The left face of the wall is at K and the right face is at K.The interface temperature (in K) of the composite wall is _______
Correct answer
399 to 401
Solution
Under steady-state conditions, the heat flux () through both sections of the composite wall is the same.For the first section (conductivity ):
For the second section (conductivity ):
Equating the two expressions for :
KThus, the interface temperature is K.
For the second section (conductivity ):
Equating the two expressions for :
KThus, the interface temperature is K.
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