1.

Thermal resistance for hollow cylinder is given as(Where, Am = logarithmic mean area of cylinder,ro, ri, L = Outer radius, inner radius and length of cylinder respectively and k = Thermal conductivity):

A. \(\frac{{{r_o} - {r_i}}}{{k{A_m}}}\)
B. \(\frac{{{r_o} - {r_i}}}{k}\)
C. \(\frac{L}{{kA}}\)
D. \(\frac{{{r_o} - {r_i}}}{{4\pi k\left( {{r_o} \times {r_i}} \right)}}\)
Answer» B. \(\frac{{{r_o} - {r_i}}}{k}\)


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