IN FL U ENCES OF SU RFACTAN T ON FRICTIONAL PRESSU RE DROP IN GAS2L IQU ID FLOW

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1 55 5 Vol Journal of Chemical Industry and Engineering (China) May 2004 (, ) (, 30167, ) 95 % (SDS), 100 mg kg - 1, 8313 % % O A (2004) IN FL U ENCES OF SU RFACTAN T ON FRICTIONAL PRESSU RE DROP IN GAS2L IQU ID FLOW XIA Guodong, WAN G Min, L U Yuanwei and MA Chongfang ( College of Environmental and Energy Engineering, Beijing U niversity of Technology, Beijing , China) MEWES Dirk ( Institute of Process Engineering, U niversity of Hannover, Hannover 30167, Germ any) Abstract The influences of surfactant on the pressure drop in horizontal two2phase flow was investigated experimentally1 Air/ water and air/ 100 mg kg - 1 sodium dodecyl sulphate ( with 95 % purity grade) aqueous solution were used as working fluids1 The results presented a demonstration that the drag reductions depended on flow regimes1 Drag reductions up to 8313 % for stratified flow, 8312 % for plug and slug flows and 3112 % for annular flow were observed in t he experiment1 The drag reduction was caused eit her by adding t he surfactant itself or by the shift of flow regime due to the addition of surfactant Keywords drag reduction, surfactant, gas2liquid two2phase flow,,,,,, , :,, 38, : ( No ) E - mail (No1 KM ) Tsinghua Tongfang Optical Disc Co, Ltd All rights reserved Received date : Corresponding author : XIA Guodong, associate professor

2 ,,, [1 ] Spedding [2 ] ( <0115 m),,, ; 11 (116 m 3 ),,,,, / /,,,, / m <01059 m 11 m Sigma 815 m, 95 % ( SDS) Digima, (Lauda GmbH & Co KG) 5 m, 3 m (20 1 ) SDS,,, /, : MPa ; 1822 ; m ; SDS Wu [3 ], SDS 100 mg kg - 1 Fig11 Schematic diagram of experimental system 1 air blower ; 2 orifice ; 3 rotameter ; 4 test section ; 5 tomography sensor ; 6 light barriers ; 7 outlet ; 8 magnetic flowmeter ; 9 pump ; 10 tank ; 11 tank ; 12 bypass Fig12 Equilibrium surface tensions of surfactant solution 10 (1 m 3 ) 2,, Friedel ; [4 ] 25000, (45T ), 2 LO = (d p F/ d z) (1) (d p F / d z) LO (d p F / d z) LO,, 45T :, 2 3 LO 2,, ; FH LO = E +,, 2 Fr We (2) Tsinghua Tongfang Optical Disc Co, Ltd All rights reserved

3 55 5 : 729 E = (1 - x) 2 + x 2 H = L G L f GO G f LO (3) F = x 0178 (1 - x) 0124 (4) G L G L (5) Fr = G2 gd 2 H (6) We = G2 D (7) H f GO f LO H, H = x x G L - 1 ( L / G ) < 1000, Whalley [5 ] Friedel SDS (p/l ) / /, ( U SL ) : m ; ( U SG ) m (8) 7, (PF), ( EBD), (SF), (AF), (SS), (SR) (SW) [6 ] 3 (a) U SL = 0102 m,,, ;, Fig13 Experimental pressure gradients 3 (b) U SL = 0111 m vs1superficial air velocity,, ( SS), ( EBD), ( SF), ( SR), ( SW) (AF),, / (AF), / U SG = 0172 m,, 3 (d) U SL = 014 m, / 3 (c) U SL = 012 m, / without surfactant ; with surfactant ; Friedel model / / m m ( PF), / ( PF), ( EBD), ( SF), Tsinghua Tongfang Optical Disc Co, Ltd All rights reserved

4 Friedel 3, U SL 4 / Friedel,, Fig14 Comparison between Friedel model and experimental data 312 ( DR), DR = p without - p with p without (9) p with ; p without, % ; 8312 % ; 3112 % Kang [7 ] 81 % 35 %,, U SL = 012 m U SG = 1113 m, /,, [2, 8 ], : Spedding [2 ] ; Rustamov [8 ] Table 1 Experimental results of drag reduction, Rustamov, U SL = 0105 m Spedding : U SG = 0107 m, 6316 % Greskovich [9 ],,, Kang [7 ] 4,, 100 mg kg - 1 / m Tsinghua Tongfang Optical Disc Co, Ltd All rights reserved U SG / m DR Flow regime without/ with SDS SR/ SW SW/ SW AF/ SW AF/ SW AF/ AF AF/ AF SS/ SS SS/ SS SS/ SS SS/ SS SR/ SS SW/ SR SW/ SW SW/ SW SW/ SW AF/ AF AF/ AF AF/ AF SS/ SS SR/ PF SW/ SW SW/ SW SW/ SW AF/ SW AF/ SW AF/ SW AF/ AF AF/ AF PF/ PF EBD/ EBD EBD/ EBD SF/ SF SF/ SF SF/ SW SF/ SW AF/ AF PF/ PF PF/ PF EBD/ EBD EBD/ EBD EBD/ EBD EBD/ EBD

5 55 5 : 731 / 8313 % ; 8312 % ; 3112 %, C, E, F, H Horizontal and Vertical Two2phase Pipe Flow1In : The European Two2phase Group Meeting Ispra, Italy, 1979 D, m 5 Whalley P B1 Boiling, Condensation and Gas2Liquid Flow1 New Fr Froude York : Oxford University Press, 1987 f GO, f LO 6 Xia Guodong ( ), Peng Yan ( ), Ma Chongfang ( References L, m d p F, Pa U SG, U SL, m We Weber x G, L, N s m - 2 G, L, H, kg m - 3 Tubes1 Dokl1 A kad1 N auk A z SS R, 1985, 41 : 68 71, N m Greskovich E J, Shrier A L1 Pressure Drop and Hold2up in 2 LO Horizontal Slug Flow1 A ICh E J, 1971, 17 : Manfield P D, Lawrence C J, Hewitt G F1 Drag Reduction with Additives in Multiphase Flow : A Literature Survey1 M ultiphase Sci1 & Tech1, 1999, 11 : Spedding P L, Hand N P1 A Revised Analysis of the Effect of Surfactants on Two2phase Phenomena in Horizontal Air2Water Pipe Flow1 Dev1 Chem1 Eng1 Mi neral Process, 1997, 5 : Wu W T, Yang Y M, Maa J R1 Nucleate Pool Boiling Enhancement by Means of Surfactant Additives1 Thermal and Fl ui d Science, 1998, 18 : Experi mental 4 Friedel L1 Improved Friction Pressure Drop Correlations for ), Mewes D Tomographic Imaging of Air2aqueous Surfactant Solution Two2phase Flow Chi nese Journal of Engi neeri ng Thermophysics ( ), 2003, 24 : 7 Kang C, Vancko R M, Green A S, Kerr H, Jepson W P1Effect of Drag2reducing Agents in Multiphase Flow Pipelines1J1 of Resources Tech1, 1998, 120 : Energy 8 Rustamov K E1 Gas2Liquid Mixture Flow with Polymer Additives in,,,,,,,,, 9811 %, 9911 %9916 %, 94 %, 98 %96 % ( ) Tsinghua Tongfang Optical Disc Co, Ltd All rights reserved