Derive an expression for the equivalent thermal conductivity of a plane wall composed…

PHYSICS · Subjective · CBSE · Physics · Thermal Properties of Matter · Thermal Properties of Matter

Problem

Derive an expression for the equivalent thermal conductivity

k_{\text{eq}}

of a plane wall composed of three layers of thicknesses

L_1

L_2

L_3

and thermal conductivities

k_1

k_2

k_3

, all having the same cross-sectional area

A

, when the layers are arranged in series.