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HW2 Solutions

HW2 Solutions - ME 364 HW 2 Solutions Problem 1 The...

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() [] C 152.9 ° = = × + = + = K 9 . 425 K) 283 ( ) 10 67 . 5 )( 5 (0.75)(0.2 ) 293 )( 25 . 0 )( 58 . 12 ( 700 ) ( 4 4 8 4 surr 4 s s s s s T T T T T A T T hA Q σε & Discussion Neglecting radiation changed T s by more than 7 ° C, so assumption is not correct in this case. Problem 3: We consider a thin spherical shell element of thickness Δ r in a sphere (see Fig. 2-17 in the text). . The density of the sphere is ρ , the specific heat is c, and the length is L. The area of the sphere normal to the direction of heat transfer at any location is where r is the value of the radius at that location .
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HW2 Solutions - ME 364 HW 2 Solutions Problem 1 The...

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