Quiz+4+08+with+key

Quiz+4+08+with+key - FTFE 331E} Sp ring 29% Quiz#4 Name K5...

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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 + mJEj-i—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 mass-avenge 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. 7-2,». 7—7150 . A two-fluid 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" éKH-bu :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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Quiz+4+08+with+key - FTFE 331E} Sp ring 29% Quiz#4 Name K5...

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