課程名稱︰單元操作
課程性質︰授課無實驗
課程教師︰呂理平
開課學院：化工系
開課系所︰化工系
考試日期（年月日）︰99/1/14
考試時限（分鐘）：open 50 close 90min
是否需發放獎勵金：是
（如未明確表示，則不予發放）
試題 :
Transport Phenomena and Unit Operations(II)
Final Examination(closed book section)
1.(20%)Explain the following terms or questions briefly:
(a)Fick's first law and Fick's second law of diffusion
(b)Higbie's and Danckwert's penetration model
(c)Schmidt number and Prandtl number
(d)Differences between heat transfer by the energy diffusion and heat transfer
by the radiation
2.(15%)
An 8 cm internal diameter, 10 cm high mug is left in a dry air at 20"C,1 atm
with its top open. If the water level in the mug is 8 cm high from the bottom
and is maintained at 20"C , determine how long(in hours)it will take for the
water evaporation and the water level becoming 4 cm high from the bottom.
Data: at 20"C
vapor pressure of water = 2.339 kPa
mass diffusivity of water vapor in air = 2.71*10^-5 m2/s
3.(15%)
For the very long grooves(very long in direction perpendicular to the paper)
shown in the following figures, please find view factor F12 in case(a),F(1+3)2
in case(b)and F21 in case (c).
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