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Unformatted text preview: FTFE 331E}
Sp ring 29% Quiz#4 Name K5 y  ' 1. Write Fisk’s law of diffusion on a mass basis for stationing coordinates. Clearly define all
symhals. (10 points) H" H
" " == — p04,”?de + mJEji—ﬁf'l
_ \........._y_—J ~_._..v_..._....a' HA W
AWLUTE WWHdmlo mum‘buﬁm due to
FLUX diffusion that is motion cf Awiﬂa motion of A relative ta massavenge motion Ream“: w mass—merge maﬁa"! of mm
tbcﬁxed of minute
mardinﬂe
system 5)," (kgm/s ' m2) is the difﬁisive mass ﬂux of species A measured miaﬁve to staﬁonmy coordinates.
51‘5" {kgmfs ‘ m2) is the difﬁlsive mass ﬂux of species 8 measured relative to stationary coorﬁinatss.
Hp is the total mass concentration.
DJ; is the binary diffusion coeﬁicient 01' mass diﬁ‘usivity. T? is the dc} qperator. mm is the mass ﬁacﬁon of species A. 72,». 7—7150 . A twoﬂuid heat exchanger has ﬁelet and outlet temperatures of 65 and 40°C for the hot ﬂuid and 15°C and Tm for the cold ﬂuid.
Tc, If the effectiveness of the exchanger is 0.5, and the cold ﬂuid has the minimum heat capacity rate, what is Tm? ___ {20 points)
€19” Cl"!an (7219” ’23,»)
... m g ——_"‘='—":'—“
C; Zn“ CM!” 7:41“! lg/‘J
é(THJAHT£$ a\: 15:0" T94
_,, —— 4— “’  T "D
(90'; [51" éKHbu :19 )0
b ' "" g C 7” r: ’5 4‘ 0' bm ,, CT” QDC T‘E40C 1'63 3. Saturated water vapor leaves a steam turbine at a ﬂow rate of 1.0 kg/s and a pressure of 0.5}
bar. The vapor is to be completely condensed to saturated liquid in a shell and tube heat
exchanger with one shell pass and two tube passes. City water is used as the cold fluid. The
water is to enter the thin wall tubes at 17°C and is to leave at 579C. Assume the properties of the water and steam are as follows:
Saturated water: Cp = 4173 t/kg  K, p = 1000 kg/m3 and a = 3.43 x 10“ N  s/mz.
Saturated steam at 0.51 bar: Tm = 355 K, hfg 2 2304 KJ/kg and k = 0,0233 W/ 111‘ K. 3 S 5 Assuming that an overall heat transfer coefﬁcient of 40% mez ‘ K, determine:
42’:
(A) The required heat transfer surface area and . (20 points)
(B) The water flow rate to completely condense the vapor. (20 points)
{197. .5 7614‘? b
:1 o «S t " "’
'* ~57°c F Has—'3 1'51‘4/5 4. A this ﬂat rubber membrane is used to separate a container of nitrogen from a gas stream
containing nitrogen with a partial pressui'e of 5 bars The yressure of the nitrogen is 15 bars.
Assume steady state conditions exist an e temperature is constant (298 K). If the
membrane is i—mm thick, what is the f nitrogen éifﬁising through the membrane? (30 points) Assume that the solubility of nitrogen in rubber is 1.56 x 10'3 kneel/(I313 a bar) M £1: O,/5XJDAq/mz/5‘ ...
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 Spring '11
 Dr.Carr

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