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[Solved]: Film boiling occurs on the surface of a sphere of
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(Solved): Film boiling occurs on the surface of a sphere of temperature T_(S)=354\deg C and diameter D=2cm whi ...


Film boiling occurs on the surface of a sphere of temperature

T_(S)=354\deg C

and diameter

D=2cm

which is plunged in a bath of saturated water at atmospheric pressure. The sphere is made out of polished copper. (a) Calculate the heat transfer coefficient due to convection,

/bar (h)_(D)

, the correction due to radiation,

/bar (h)_(rad)

, and the total heat transfer rate from the copper ball to the water pool. For the emissivity of the copper surface, assume that

\epsi lon_(w)=0.05

. (b) Model the copper sphere as a lumped capacitance, and calculate its new temperature 10 s after the start of film boiling. For (b) ,consider the following relation for copper ball as capacitance:

-\rho c_(P)V(dT_(S))/(dt)=q_(S)
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