歯522박병호.PDF

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1 2001 The Effect of Nozzle Locaton on the Concentraton Profles n Chemcal Addton Tank,,, , dsk block, CFD FLUENT 5, Abstract A numercal analyss of the flow and necton characterstcs s performed for the flow feld created by water nected nto a cylndrcal tank wth an ntally statonary flud The flow s relevant to the operaton of the chemcal addton system n the chemcal and volume control system (CVCS) of nuclear power plants Ths study s performed to mprove the current desgn whch has a dsk block nsde tank The numercal analyss for the flow and necton characterstcs n chemcal addton tank are carred out usng CFD code FLUENT 5 Results show that the nlet nozzle nstalled n tangental drecton at the uppermost regon of the tank cylnder and the outlet nozzle located at the center of the tank bottom s very effectve n enhancng the necton n the tank 1 1,,,

2 , [1] (dssolved oxygen), ph (CVCS, Chemcal and Volume Control System) (CAS, Chemcal Addton System) (VCT, Volume Control Tank) (oxdzng speces) (hydrazne, N 2 H 4 ), ph L 7 ( -7) (LOHH 2 O) 1996 dsk block [2] dsk block / dsk block 4 dsk block, 2 1, m 3, (H/D) 2 03 m,, m 3 /s [2] dsk block, ase 1) (Fg 1), case 2) 1/4 (Fg 1), case 3) 1/4 (Fg 1(c)), case 4) (Fg 1(d))

3 (t<0), 1 t=0 0 ( ), Reynolds 3,900 Case 1 3,, [3] ρ t + ( ρu ) = 0 p τ ( ρ u ) + ( ρuu ) = + + ρg (2) t ( ρ ma ) + ( ρuma ) = J A, (3) t ρ u p m,, (1) τ J,,, A u u τ = µ ( + ) (4) ma J A, = ρ DA, m (5) D A, m (mxture) A 0096 m/s, (no-slp condton) CFD FLUENT 5 2 (second-order backward mplct Euler method)

4 , (frst-order upwnd scheme), (segregated) SIMPLE,, (mesh adapton), , , 3,000-5,000, (PWR, Pressurzed Water Reactor) (CSTR, Contnuous Strred-Tank Reactor) [4] win C = CIN + ( CO CIN ) exp( t) (6) W, t=, (sec) TANK C IN =, (kg/kg) C O =, (kg/kg) w IN =, (kg/s) W TANK =, (kg) 100 Table 1 Fg 2 ( ) 1 Fg 2 case % dsk block (6) [2], case 4 dsk block

5 Fg 3 case1 1 1/6, 1/2 5/6, Case 1, case 1 dsk block, Fg 2 case 2, 3 4 case 1, Fg 4, 5 6 case 2, /6, 1/2 5/6, case 2, 3 4 case 4 case 4 H/D Fg 7 H/D 1, H/D 5, CFD FLUENT 5 case 1), case 2) 1/4, case 3) 1/4, case 4),,,

6 6 (1) EPRI, "PWR prmary water chemstry gudelnes, Rev3", TR , 1995 (2) Chang, KS, and Park, BH, "A numercal study on mxng characterstcs of the chemcal necton tank", Journal of the Korean Nuclear Socety, Vol 29, No 1, 1997, pp (3) "FLUENT 5 User's Gude", Fluent Inc, 1998 (4) Brd, RB, Stewart, WE and Lghtfoot, EN, "Transport phenomena", Wley, New York, 1960 (5) Patankar, SV, "Numercal heat transfer and flud flow", McGraw-Hll, New York, 1980 (6) Versteeg, HK, and Malalasekera, W, "An Introducton to Computatonal Flud Dynamcs - The Fnte Volume Method", Longman Scentfc & Techncal, 1995 (7) Van Sonsbeek, HM, van Verlaan, P and Tramper, J, "Hydrodynamcs, mxng, and oxygen transfer n lqud-mpelled loop reactors", Inter Chem E Symposum 121(1990) (8) Yoo, GJ, and So, RMC, "Varable densty effects on axsymmetrc sudden-expanson flows", Inter J Heat Mass Transfer 32(1989) Table 1 Normalzed average speces concentraton for varous tme (t=5 mn) (t=10 mn) (t=15 mn) (t=20 mn) Case Case Case Case Case 1 Cave/Co CSTR Eq Case 2&3 02 Case 4 (c) (d) Tme (mn) Fg1 Inlet/outlet nozzle locaton for each case Fg 2 Tme dependent normalzed average speces concentraton for varous case

7 Fg 3 Contours of concentraton at the cross secton for case 1 (tme=60mn) Fg 4 Contours of concentraton at the cross secton for case 2 (tme = 5 mn) Fg 5 Contours of concentraton at the cross secton for case 3 (tme=5mn) Fg 6 Contours of concentraton at the cross secton for case 4 (tme = 5 mn) 10 Cave/Co H/D=4 04 H/D=1 H/D= Tme (mn) Fg 7 Tme dependent normalzed average speces concentraton for varous geometres (case 4)

DBPIA-NURIMEDIA

DBPIA-NURIMEDIA PE 연료전지에서유로형상변화에따른수치해석적연구 전동협 1) 김병문 *,1) 남진현 2) 동국대학교원자력및에너지공학과 1) 대구대학교기계공학과 2) Numercal study of PE fuel cell accordng to the araton of flow felds Dong Hyup Jeon 1) Byung oon Km *,1) Jn Hyun Nam 2)

歯522박병호.PDF

歯522박병호.PDF