Experimental investigation on flow characteristics in circular tube inserted with rotor-assembled strand using PIV
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摘要
Rotor-assembled strand works as a typical tube insert to achieve heat transfer augmentation and scale inhibition in a heat exchanger.In this work, the PIV experiment regarding the flow fields in a circular tube inserted with rotor-assembled strand was conducted and the flow characteristics on transverse section and longitudinal section were analyzed.The results showed that swirling flow was produced in the tube inserted with rotors and it was particularly strong within the swing diameter of the rotor on the section that contains the rotor;the average turbulence intensity and the radial velocity were improved notably; the velocity vectors on the longitudinal section remained along the direction of a straight line; both the swirling flow and average turbulence intensity were higher for the rotor with three blades than for the rotor with two blades except that the radial velocity was approximate, but they were all reduced by enlarging the lead of the rotor.Characterization of the flow patterns in a circular tube contributes to understanding the heat transfer efficiency and scale inhibition performance of the rotor-assembled strand and provides guidance for its application.
Rotor-assembled strand works as a typical tube insert to achieve heat transfer augmentation and scale inhibition in a heat exchanger.In this work, the PIV experiment regarding the flow fields in a circular tube inserted with rotor-assembled strand was conducted and the flow characteristics on transverse section and longitudinal section were analyzed.The results showed that swirling flow was produced in the tube inserted with rotors and it was particularly strong within the swing diameter of the rotor on the section that contains the rotor;the average turbulence intensity and the radial velocity were improved notably; the velocity vectors on the longitudinal section remained along the direction of a straight line; both the swirling flow and average turbulence intensity were higher for the rotor with three blades than for the rotor with two blades except that the radial velocity was approximate, but they were all reduced by enlarging the lead of the rotor.Characterization of the flow patterns in a circular tube contributes to understanding the heat transfer efficiency and scale inhibition performance of the rotor-assembled strand and provides guidance for its application.
Rotor-assembled strand works as a typical tube insert to achieve heat transfer augmentation and scale inhibition in a heat exchanger.In this work, the PIV experiment regarding the flow fields in a circular tube inserted with rotor-assembled strand was conducted and the flow characteristics on transverse section and longitudinal section were analyzed.The results showed that swirling flow was produced in the tube inserted with rotors and it was particularly strong within the swing diameter of the rotor on the section that contains the rotor;the average turbulence intensity and the radial velocity were improved notably; the velocity vectors on the longitudinal section remained along the direction of a straight line; both the swirling flow and average turbulence intensity were higher for the rotor with three blades than for the rotor with two blades except that the radial velocity was approximate, but they were all reduced by enlarging the lead of the rotor.Characterization of the flow patterns in a circular tube contributes to understanding the heat transfer efficiency and scale inhibition performance of the rotor-assembled strand and provides guidance for its application.
引文
[1]A.E.Bergles,ExHFT for fourth generation heat transfer technology,Exp.Thermal Fluid Sci.26(2002)335-344.
[2]A.E.Bergles,Enhanced heat transfer:Endless frontier,or mature and routine?Enhanc.Heat Transf.6(1999)79-88.
[3]M.A.Akhavan-Behabadi,R.Kumar,M.R.Salimpour,R.Azimi,Pressure drop and heat transfer augmentation due to coiled wire inserts during laminar flow of oil inside a horizontal tube,Int.J.Therm.Sci.49(2010)373-379.
[4]O.Keklikcioglu,V.Ozceyhan,Entropy generation analysis for a circular tube with equilateral triangle cross sectioned coiled-wire inserts,Energy 139(2017)65-75.
[5]K.Sharifi,M.Sabeti,M.Rafiei,A.H.Mohammadi,L.Shirazi,Computational fluid dynamics(CFD)technique to study the effects of helical wire inserts on heat transfer and pressure drop in a double pipe heat exchanger,Appl.Therm.Eng.128(2018)898-910.
[6]Y.Qi,Y.Kawaguchi,R.N.Christensen,J.L.Zakin,Enhancing heat transfer ability of drag reducing surfactant solutions with static mixers and honeycombs,Int.J.Heat Mass Transf.46(2003)5161-5173.
[7]S.Chamoli,R.Lu,P.Yu,Thermal characteristic of a turbulent flow through a circular tube fitted with perforated vortex generator inserts,Appl.Therm.Eng.121(2017)1117-1134.
[8]Y.G.Lei,F.Zheng,C.F.Song,Y.K.Lyu,Improving the thermal hydraulic performance of a circular tube by using punched delta-winglet vortex generators,Int.J.Heat Mass Transf.111(2017)299-311.
[9]A.T.Wijayanta,T.Istanto,K.Kariya,A.Miyara,Heat transfer enhancement of internal flow by inserting punched delta winglet vortex generators with various attack angles,Exp.Thermal Fluid Sci.87(2017)141-148.
[10]C.C.Zhang,D.B.Wang,K.Ren,Y.Han,Y.G.Zhu,X.Peng,J.Deng,X.Y.Zhang,Acomparative review of self-rotating and stationary twisted tape inserts in heat exchanger,Renew.Sust.Energ.Rev.53(2016)433-449.
[11]N.Mashoofi,S.Pourahmad,S.M.Pesteei,Study the effect of axially perforated twisted tapes on the thermal performance enhancement factor of a double tube heat exchanger,Case Stud.Therm.Eng.10(2017)161-168.
[12]N.Piriyarungrod,S.Eiamsa-ard,C.Thianpong,M.Pimsarn,K.Nanan,Heat transfer enhancement by tapered twisted tape inserts,Chem.Eng.Process.Process Intensif.96(2015)62-71.
[13]C.Z.Man,J.Y.Yao,C.Wang,The experimental study on the heat transfer and friction factor characteristics in tube with a new kind of twisted tape insert,Int.Commun.Heat Mass Transf.75(2016)124-129.
[14]S.Chokphoemphun,M.Pimsarn,C.Thianpong,P.Promvonge,Thermal performance of tubular heat exchanger with multiple twisted-tape inserts,Chin.J.Chem.Eng.23(2015)755-762.
[15]W.M.Yang,Y.M.Ding,L.B.Geng,W.Huang,Rotor-assembled Automatic Cleaning and Heat Transfer Enhancement Device,CN Pat,200520127121.9,2005.
[16]C.G.Han,W.M.Yang,Y.M.Ding,C.F.Guan,F.X.Li,Z.Zhang,H.Yan,Experimental study of heat transfer enhancement and friction loss induced by inserted rotor-assembled strand(II)lubricant oil 22,Chin.J.Chem.Eng.19(2011)1069-1074.
[17]Z.Zhang,W.M.Yang,C.F.Guan,Y.M.Ding,H.Yan,Numerical study on thermohydraulic characteristics of turbulent flow in a circular tube fitted with helical blade rotors,Int.J.Heat Mass Transf.60(2013)603-611.
[18]P.Jiang,W.M.Yang,H.Yan,C.F.Guan,Performance assessment in a tube with rotorassembled strands mixed by spiral slot rotor and low flow resistance rotor,Appl.Therm.Eng.52(2013)69-76.
[19]Z.Zhang,H.Yan,W.M.Yang,Y.P.Zhou,Y.M.Ding,C.F.Guan,Heat transfer enhancement in the tube fitted with Left-Right helical blade rotors,Appl.Therm.Eng.55(2013)95-101.
[20]P.B.Jasiński,Numerical study of the thermo-hydraulic characteristics in a circular tube with ball turbulators.Part 1:PIV experiments and a pressure drop,Int.J.Heat Mass Transf.74(2014)48-59.
[21]M.S.Song,S.H.Park,E.S.Kim,Particle image velocimetry measurements of 2-dimensional velocity field around twisted tape,Fusion Eng.Des.109-111((2016)596-601.
[22]C.C.Che,M.C.Tian,G.M.Zhang,X.L.Leng,Experimental study by PIV of swirling flow induced by trapezoid-winglets,J.Hydrodyn.Ser.B 25(2013)919-928.
[23]L.C.He,C.F.Guan,C.W.Zhang,C.J.He,J.Y.He,H.Yan,PIV experiment for tube fitted with rotors,CIESC J.65(2014)4755-4759(in Chinese).
[2]A.E.Bergles,Enhanced heat transfer:Endless frontier,or mature and routine?Enhanc.Heat Transf.6(1999)79-88.
[3]M.A.Akhavan-Behabadi,R.Kumar,M.R.Salimpour,R.Azimi,Pressure drop and heat transfer augmentation due to coiled wire inserts during laminar flow of oil inside a horizontal tube,Int.J.Therm.Sci.49(2010)373-379.
[4]O.Keklikcioglu,V.Ozceyhan,Entropy generation analysis for a circular tube with equilateral triangle cross sectioned coiled-wire inserts,Energy 139(2017)65-75.
[5]K.Sharifi,M.Sabeti,M.Rafiei,A.H.Mohammadi,L.Shirazi,Computational fluid dynamics(CFD)technique to study the effects of helical wire inserts on heat transfer and pressure drop in a double pipe heat exchanger,Appl.Therm.Eng.128(2018)898-910.
[6]Y.Qi,Y.Kawaguchi,R.N.Christensen,J.L.Zakin,Enhancing heat transfer ability of drag reducing surfactant solutions with static mixers and honeycombs,Int.J.Heat Mass Transf.46(2003)5161-5173.
[7]S.Chamoli,R.Lu,P.Yu,Thermal characteristic of a turbulent flow through a circular tube fitted with perforated vortex generator inserts,Appl.Therm.Eng.121(2017)1117-1134.
[8]Y.G.Lei,F.Zheng,C.F.Song,Y.K.Lyu,Improving the thermal hydraulic performance of a circular tube by using punched delta-winglet vortex generators,Int.J.Heat Mass Transf.111(2017)299-311.
[9]A.T.Wijayanta,T.Istanto,K.Kariya,A.Miyara,Heat transfer enhancement of internal flow by inserting punched delta winglet vortex generators with various attack angles,Exp.Thermal Fluid Sci.87(2017)141-148.
[10]C.C.Zhang,D.B.Wang,K.Ren,Y.Han,Y.G.Zhu,X.Peng,J.Deng,X.Y.Zhang,Acomparative review of self-rotating and stationary twisted tape inserts in heat exchanger,Renew.Sust.Energ.Rev.53(2016)433-449.
[11]N.Mashoofi,S.Pourahmad,S.M.Pesteei,Study the effect of axially perforated twisted tapes on the thermal performance enhancement factor of a double tube heat exchanger,Case Stud.Therm.Eng.10(2017)161-168.
[12]N.Piriyarungrod,S.Eiamsa-ard,C.Thianpong,M.Pimsarn,K.Nanan,Heat transfer enhancement by tapered twisted tape inserts,Chem.Eng.Process.Process Intensif.96(2015)62-71.
[13]C.Z.Man,J.Y.Yao,C.Wang,The experimental study on the heat transfer and friction factor characteristics in tube with a new kind of twisted tape insert,Int.Commun.Heat Mass Transf.75(2016)124-129.
[14]S.Chokphoemphun,M.Pimsarn,C.Thianpong,P.Promvonge,Thermal performance of tubular heat exchanger with multiple twisted-tape inserts,Chin.J.Chem.Eng.23(2015)755-762.
[15]W.M.Yang,Y.M.Ding,L.B.Geng,W.Huang,Rotor-assembled Automatic Cleaning and Heat Transfer Enhancement Device,CN Pat,200520127121.9,2005.
[16]C.G.Han,W.M.Yang,Y.M.Ding,C.F.Guan,F.X.Li,Z.Zhang,H.Yan,Experimental study of heat transfer enhancement and friction loss induced by inserted rotor-assembled strand(II)lubricant oil 22,Chin.J.Chem.Eng.19(2011)1069-1074.
[17]Z.Zhang,W.M.Yang,C.F.Guan,Y.M.Ding,H.Yan,Numerical study on thermohydraulic characteristics of turbulent flow in a circular tube fitted with helical blade rotors,Int.J.Heat Mass Transf.60(2013)603-611.
[18]P.Jiang,W.M.Yang,H.Yan,C.F.Guan,Performance assessment in a tube with rotorassembled strands mixed by spiral slot rotor and low flow resistance rotor,Appl.Therm.Eng.52(2013)69-76.
[19]Z.Zhang,H.Yan,W.M.Yang,Y.P.Zhou,Y.M.Ding,C.F.Guan,Heat transfer enhancement in the tube fitted with Left-Right helical blade rotors,Appl.Therm.Eng.55(2013)95-101.
[20]P.B.Jasiński,Numerical study of the thermo-hydraulic characteristics in a circular tube with ball turbulators.Part 1:PIV experiments and a pressure drop,Int.J.Heat Mass Transf.74(2014)48-59.
[21]M.S.Song,S.H.Park,E.S.Kim,Particle image velocimetry measurements of 2-dimensional velocity field around twisted tape,Fusion Eng.Des.109-111((2016)596-601.
[22]C.C.Che,M.C.Tian,G.M.Zhang,X.L.Leng,Experimental study by PIV of swirling flow induced by trapezoid-winglets,J.Hydrodyn.Ser.B 25(2013)919-928.
[23]L.C.He,C.F.Guan,C.W.Zhang,C.J.He,J.Y.He,H.Yan,PIV experiment for tube fitted with rotors,CIESC J.65(2014)4755-4759(in Chinese).