IT KING

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Teaching Since: Apr 2017
Last Sign in: 453 Weeks Ago, 4 Days Ago
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  • MSC,MBA(IT)
    Standford
    Jun-1997 - Sep-2000

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    Honeywell
    Aug-2001 - Present

Category > Applied Sciences Posted 30 Apr 2017 My Price 9.00

Consider the steel balls


Consider the steel balls of Problem 5.6, except now the air temperature increases with time as T∞(t) 325 K at, where a 0.1875 K/s.

 

(a) Sketch the ball temperature versus time for 0 ≤ t ≤ 1 h. Also show the ambient temperature, T∞, in your graph. Explain special features of the ball temperature behavior.

(b) Find an expression for the ball temperature as a function of time T(t), and plot the ball temperature for 0 ≤ t ≤ 1 h. Was your sketch correct?

Problem 5.6

Steel balls 12 mm in diameter are annealed by heating to 1150 K and then slowly cooling to 400 K in an air environment for which T∞ = 325 K and h = 20 W/m2 ∙ K. Assuming the properties of the steel to be k = 40 W/m∙ K, 7800 kg/m3, and c = 600 J/kg ∙ K, estimate the time required for the cooling process.

Answers

IT KING
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Status NEW Posted 30 Apr 2017 07:04 AM My Price 9.00

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