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Three rods of same cross-section but dif...

Three rods of same cross-section but different length and conductivity are joined in series . If the temperature of the two extreme ends are `T_(1) and T_(2) (T_(1)gtT_(2))` find the rate of heat transfer H.

Text Solution

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Total thermal resistance R=`R_1+R_2+R_3=(L_1)/(k_1A)+(L_2)/(K_2A)+(L_3)/(K_3A)`
now, `H=(T_1-T_2)/( R)`
`H=(T_1-T_2)/((L_1)/(k_1A)+(L_2)/(k_2A)+(L_3)/(k_3A))`
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