Unformatted text preview: W m K ⋅ := α 1.75 10 7 − ⋅ m 2 s := T air 303K := T i 275K := T mid 288K := Assumptions 1. Long cylinder, L/R > 10 2. 1d conduction in r direction (if LC not valid) 3. neglect radiation 4. check to see if Lumped Capacitance is valid 5. If LC is not valid, check to see if 1term approximate solution is valid Is lumped capacitance valid? L c r 2 := for cylinder L c 0.04 m = Bi h L c ⋅ k := Bi 2 = Bi is > 0.1, so LC method is NOT valid, must consider spatial effects. Recalculate Bi for Table 5.1...
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 Spring '11
 Anthony
 Heat, Heat Transfer, heat transfer coefficient, Tair, diameter cylindrical piece, Lc k Bi

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