02 0012 2 06 06 06 1 2 03848

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Unformatted text preview: k k ⎠ྏ ⎥ྏ ⎢ྎ ⎣ྏ ⎦ྏ 1/ 2 u Nu uNu ⎡ྎ⎛ྎ D ⎞ྏ2 ⎛ྎ h ⎞ྏ2 ⎛ྎ −hD ⎞ྏ2 ⎤ྏ = ± ⎢ྎ⎜ྎ u h ⎟ྏ + ⎜ྎ u D ⎟ྏ + ⎜ྎ u ⎟ྏ ⎥ྏ = k ⎠ྏ ⎝ྎ k ⎠ྏ ⎝ྎ k 2 k ⎠ྏ ⎥ྏ ⎢ྎ⎝ྎ ⎣ྏ ⎦ྏ 2 2 2 '! $! $! $* )# 0.02 10.5& + # 150 0.0005& + # −150 x 0.02 0.012 & , =± 2 )" 0.6 % " 0.6 % " 0.6 %, ( + 1 2 = ±0.3848 = ±0.385 where uh = (0.0700)(150.) = 10.5 W/m2-K uD = 0.000500 m uk = (0.0200)(0.600) = 0.0120 W/m-K Then, we estimate the Nusselt number here to...
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This note was uploaded on 01/07/2013 for the course ENGR 201 taught by Professor Miller during the Spring '08 term at Drexel.

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