Engineering, 20.03.2020 04:59 badgirl2005
A 25 cm stainless steel ball is removed from the oven at a uniform temperature of 300 C. The ball isthen subjected to the flow of air at one atm pressure and 27 C with a velocity of 3 m/sec. Thesurface temperature of the ball eventually drops to 200 C. Determine the convection heat transfercoefficient during this cooling process.
Answers: 3
![Nu = \frac{hD}{k} = 2 + [0.4Re^{1/2}+0.06Re^{2/3}]Pr^{0.4}(\frac{\mu_{\infty}}{\mu_s} )\\\\= 2 + [0.4(4.802 \times 10^4)^{1/2}+0.06(4.802 \times 10^4)^{2/3}](0.7296)^{0.4}(\frac{1.849 \times 10^{-5}}{2.76 \times10^5 } )\\\\=135](/tpl/images/0555/4725/d2141.png)
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A 25 cm stainless steel ball is removed from the oven at a uniform temperature of 300 C. The ball is...
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