railway RRB JE (CBT I + CBT II) Mock Test 2024 Heat Transfer Fins

The efficiency of a pin fin with insulated tip is

1
\(\frac{{\tanh mL}}{{\sqrt {\frac{{hA}}{{kP}}} }}\)
2
\(\frac{{\tanh mL}}{{mL}}\)
3
\(\frac{{mL}}{{\tanh mL}}\)
4
\(\frac{{\sqrt {\frac{{hA}}{{kP}}} }}{{\tanh mL}}\)
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