Chaotic mixing by longitudinal vorticity

被引:30
作者
Habchi, Charbel [1 ]
Harion, Jean-Luc [2 ,3 ]
Russeil, Serge [2 ,3 ]
Bougeard, Daniel [2 ,3 ]
Hachem, Farouk [1 ]
Elmarakbi, Ahmed [4 ]
机构
[1] LIU, Energy & Thermofluids Grp ETF, Sch Engn, Beirut, Lebanon
[2] Mines Douai, F-59500 Douai, France
[3] Univ Lille Nord France, F-59000 Lille, France
[4] Univ Sunderland, Dept Comp Engn & Technol, Fac Appl Sci, Sunderland SR6 0DD, England
关键词
Vortex generator; Chaotic advection; Chemical reactors; Static mixer; Laminar flow; Mixing; TUBE BANK FIN; HEAT-EXCHANGERS; STATIC MIXERS; FLOW; ADVECTION; INTENSIFICATION; ENHANCEMENT; DISPERSION; REACTORS; FLUID;
D O I
10.1016/j.ces.2013.09.032
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
In this paper, scalar mixing by several arrays of vortex generators mounted inside a circular pipe is investigated using numerical simulations. Two flow configurations are studied in which the arrays are in-line and rotated periodically by an angle of 90 degrees. Each vortex generator creates a pair of streamwise vortices which enhances the mixing process in the flow cross-section, It is shown that the alternate configuration, in which the vortex generators are rotated periodically by an angle of 90 degrees enhances the mixing process relative to the in-line one due to the generation of chaotic advection flow, while in the in-line configuration the Bow is regular and the mixing process is only caused by the convective motion of the longitudinal vortices. Both Eulerian and Lagrangian analyses are used to investigate the chaotic behavior. From the Poincare sections, the alternate rotation of the vortex generators is found to better disperse the fluid particles in the flow cross-section, while in the in-line array the particles are trapped into the vortex core. The Lagrangian study shows that initially close fluid particle paths exhibit an exponential remoteness in the alternate configuration, a sign of chaotic advection flow. This chaotic advection enhances the stretching and folding of the fluid particles which are responsible for mixing in laminar flows. The proposed flow configuration can be used as a multifunctional heat exchanger/reactor for industrial applications such as in chemical reaction and food processing. (C) 2013 Elsevier Ltd. All rights reserved.
引用
收藏
页码:439 / 450
页数:12
相关论文
共 33 条
[1]   Lagrangian chaos, Eulerian chaos, and mixing enhancement in converging-diverging channel flows [J].
Amon, CH ;
Guzman, AM ;
Morel, B .
PHYSICS OF FLUIDS, 1996, 8 (05) :1192-1206
[2]  
[Anonymous], AC RES REL 14 0
[3]   Heat exchanger/reactors (HEX reactors): Concepts, technologies: State-of-the-art [J].
Anxionnaz, Z. ;
Cabassud, M. ;
Gourdon, C. ;
Tochon, R. .
CHEMICAL ENGINEERING AND PROCESSING-PROCESS INTENSIFICATION, 2008, 47 (12) :2029-2050
[4]   STIRRING BY CHAOTIC ADVECTION [J].
AREF, H .
JOURNAL OF FLUID MECHANICS, 1984, 143 (JUN) :1-21
[5]   Chaotic mixing efficiency in different geometries of Hele-Shaw cells [J].
Beuf, Aurelien ;
Gence, Jean-Noel ;
Carriere, Philippe ;
Raynal, Florence .
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, 2010, 53 (04) :684-693
[6]   Procedure for estimation and reporting of uncertainty due to discretization in CFD applications [J].
Celik, Ishmail B. ;
Ghia, Urmila ;
Roache, Patrick J. ;
Freitas, Christopher J. .
JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME, 2008, 130 (07) :0780011-0780014
[7]   Numerical study of the relationship between heat transfer enhancement and absolute vorticity flux along main flow direction in a channel formed by a flat tube bank fin with vortex generators [J].
Chang, Li-Min ;
Wang, Liang-Bi ;
Song, Ke-Wei ;
Sun, Dong-Liang ;
Fan, Ju-Fang .
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, 2009, 52 (7-8) :1794-1801
[8]  
Dean WR, 1928, PHILOS MAG, V5, P673
[9]   CFD calculation of laminar striation thinning in static mixer reactors [J].
Fourcade, E ;
Wadley, R ;
Hoefsloot, HCJ ;
Green, A ;
Iedema, PD .
CHEMICAL ENGINEERING SCIENCE, 2001, 56 (23) :6729-6741
[10]  
Habchi C, 2010, PROCEEDINGS OF THE ASME INTERNATIONAL HEAT TRANSFER CONFERENCE - 2010, VOL 2, P377