Mathcad - Quiz 6 solutions

Mathcad - Quiz 6 solutions - 1. Copper spheres (density...

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or 94.9 C T 367.925 K = T exp h A s ρ V c p t T i T air () T air + := V A s 3.333 10 3 × m = V 4.189 10 6 × m 3 = V 4 3 π r 3 := A s 1.257 10 3 × m 2 = A s 4 π r 2 := Bi << 0.1, so LC method is valid, and Temperature gradient in solid is negligible. Bi 6.65 10 4 × = Bi hL c k := L c 3.333 10 3 × m = L c r 3 := for sphere Calculate Biot number Assume 1. Unsteady state cooling 2. Check to see if Lumped Capacitance is valid 3. Neglect radiation exchange with surroundings 4. Constant properties h8 0 W m 2 K := r 0.01 m = r D 2 := D2 c m := t 2min := T air 303K := T i 453 K = T i 180 273 + () K := α 1.166 10 4 × m 2 s =
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This note was uploaded on 03/11/2011 for the course CHEME 333 taught by Professor Anthony during the Spring '11 term at UNL.

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