A composite slab has two layers of different materials with thermal conductivities k₁ and k₂. If each layer has the same thickness, then the equivalent thermal conductivity of the slab will be?

k₁ k₂
(k₁ + k₂)
(k₁ + k₂)/ k₁ k₂
2 k₁ k₂/ (k₁ + k₂)

LohaHridoy

5 views

2025-01-04 04:42

1 Answers

AhmedNazir

Answer: Option 4

conductance = k * (A/l) where A = slab area, l = slab thickness, k = conductivity. The equation for series conductance is : cond(total) = (cond1 * cond2)/(cond1 + cond2) Because the geometry of the slabs is the same: k(total) = 2(k1 * k2)/(k1 + k2)

5 views Answered 2022-09-01 13:21

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