IDDES simulation of flow and mixing characteristics in a confined impinging jet reactor

doi:10.7523/j.ucas.2022.050

Abstract

Abstract: There exist various vortical structures in the turbulent flow field of confined impinging jet reactors, which have important effects on the flow characteristic and mixing performance. A numerical study was conducted on the flow field of a confined impinging jet reactor using the IDDES method based on SST k-ω turbulent model. Various large-scale vortical structures were identified, and their generation and evolution mechanisms were discussed. The effects of vortices on the phase-averaged temperature and heat flux fields were discussed to reveal the mixing mechanism. Results indicated that the alternating deflection of two jets leaded to unequal momentum between them, and the self-sustained oscillation of two jet shear layers caused the periodic motion of vortices, hence the stagnation point deviated from the mid-point periodically. Large-scale spanwise vortices were generated in the downstream region due to the development of K-H instability. The streamwise vortices in the impinging region only enhanced the thermal mixing near the channel axis, while the spanwise vortices could stimulate a large-scale heat transport and turbulent mixing in the downstream region.

Key words: impinging jet reactors, IDDES, vortical structure, flow characteristics, mixing characteristics

CLC Number:

TQ021.1

JIN Linna, CAO Yuhui. IDDES simulation of flow and mixing characteristics in a confined impinging jet reactor[J]. Journal of University of Chinese Academy of Sciences, 2024, 41(2): 165-175.

References

[1] Teixeira A M, Santos R J, Costa M R P F N, et al. Hydrodynamics of the mixing head in RIM: LDA flow-field characterization[J]. AIChE Journal, 2005, 51(6): 1608-1619. DOI:10.1002/aic.10454.
[2] Santos R J, Teixeira A M, Lopes J C B. Study of mixing and chemical reaction in RIM[J]. Chemical Engineering Science, 2005, 60(8/9): 2381-2398. DOI:10.1016/j.ces.2004.11.050.
[3] Stull F D, Craig R R, Streby G D, et al. Investigation of a dual inlet side dump combustor using liquid fuel injection[J]. Journal of Propulsion and Power, 1985, 1(1):83-88. DOI:10.2514/3.22763.
[4] Hosseinalipour S M, Mujumdar A S. Flow, heat transfer and particle drying characteristics in confined opposing turbulent jets: a numerical study[J]. Drying Technology, 1995, 13(3): 753-781. DOI:10.1080/07373939508916982.
[5] Johnson B K, Prud’homme R K. Mechanism for rapid self-assembly of block copolymer nanoparticles[J]. Physical Review Letters, 2003, 91(11): 118302. DOI:10.1103/PhysRevLett.91.118302.
[6] Sultan M A, Fonte C P, Dias M M, et al. Experimental study of flow regime and mixing in T-jets mixers[J]. Chemical Engineering Science, 2012, 73: 388-399. DOI:10.1016/j.ces.2012.02.010.
[7] Krupa K, Nunes M I, Santos R J, et al. Characterization of micromixing in T-jet mixers[J]. Chemical Engineering Science, 2014, 111: 48-55. DOI:10. 1016/j.ces.2014.02.018.
[8] Li W F, Du K J, Yu G S, et al. Experimental study of flow regimes in three-dimensional confined impinging jets reactor[J]. AIChE Journal, 2014, 60(8): 3033-3045. DOI:10.1002/aic.14459.
[9] Wang S J, Mujumdar A S. A numerical study of flow and mixing characteristics of three-dimensional confined turbulent opposing jets: unequal jets[J]. Chemical Engineering and Processing: Process Intensification, 2005, 44(10): 1068-1074. DOI:10.1016/j.cep.2005.02.003.
[10] Srisamran C, Devahastin S. Numerical simulation of flow and mixing behavior of impinging streams of shear-thinning fluids[J]. Chemical Engineering Science, 2006, 61(15): 4884-4892. DOI:10.1016/j.ces.2006.03.031.
[11] Qiu S X, Xu P, Qiao X W, et al. Flow and mixing characteristics of pulsed confined opposed jets in turbulent flow regime[J]. Heat and Mass Transfer, 2013, 49(2): 277-284. DOI:10.1007/s00231-012-1092-9.
[12] Fonte C P, Sultan M A, Santos R J, et al. Flow imbalance and Reynolds number impact on mixing in Confined Impinging Jets[J]. Chemical Engineering Journal, 2015, 260: 316-330. DOI:10.1016/j.cej.2014.08.090.
[13] Schwertfirm F, Gradl J, Schwarzer H C, et al. The low Reynolds number turbulent flow and mixing in a confined impinging jet reactor[J]. International Journal of Heat and Fluid Flow, 2007, 28(6): 1429-1442. DOI:10.1016/j.ijheatfluidflow.2007.04.019.
[14] Wang S J, Mujumdar A S. Three-dimensional analysis of flow and mixing characteristics of a novel in-line opposing-jet mixer[J]. Industrial & Engineering Chemistry Research, 2007, 46(2): 632-642. DOI:10.1021/ie060659z.
[15] Shi Z H, Li W F, Du K J, et al. Experimental study of mixing enhancement of viscous liquids in confined impinging jets reactor at low jet Reynolds numbers[J]. Chemical Engineering Science, 2015, 138: 216-226. DOI:10.1016/j.ces.2015.08.014.
[16] Zhang J W, Liu S F, Cheng C, et al. Investigation of three-dimensional flow regime and mixing characteristic in T-jet reactor[J]. Chemical Engineering Journal, 2019, 358: 1561-1573. DOI:10.1016/j.cej.2018.10.112.
[17] Devahastin S, Mujumdar A S. A study of turbulent mixing of confined impinging streams using a new composite turbulence model[J]. Industrial & Engineering Chemistry Research, 2001, 40(22): 4998-5004. DOI:10.1021/ie010153a.
[18] Hwang Y H, Hung Y H. Turbulent transport phenomena in three-dimensional side-dump ramjet combustors[J]. International Journal of Heat and Mass Transfer, 1989, 32(11): 2113-2125. DOI:10.1016/0017-9310(89)90118-X.
[19] Wang S J, Mujumdar A S. Flow and mixing characteristics of multiple and multi-set opposing jets[J]. Chemical Engineering and Processing: Process Intensification, 2007, 46(8): 703-712. DOI:10.1016/j.cep.2006.09.006.
[20] Liou T M, Wu S M, Hwang Y H. Experimental and theoretical investigations of turbulent flow in a side-inlet rectangular combustor[J]. Journal of Propulsion and Power, 1990, 6(2): 131-138. DOI:10.2514/3.23234.
[21] Spalart P R, Jou W H, Strelets M, et al. Comments on the feasibility of LES for wings, and on a hybrid RANS/LES approach[C]//Proceedings of first AFOSR International Conference on DNS/LES. Greyden Press. August 4-8, 1997, Ruston, Louisiana. 1997: 137-147.
[22] Shur M L, Spalart P R, Strelets M K, et al. A hybrid RANS-LES approach with delayed-DES and wall-modelled LES capabilities[J]. International Journal of Heat and Fluid Flow, 2008, 29(6): 1638-1649. DOI:10.1016/j.ijheatfluidflow.2008.07.001.
[23] Niu J Q, Wang Y M, Zhang L, et al. Numerical analysis of aerodynamic characteristics of high-speed train with different train nose lengths[J]. International Journal of Heat and Mass Transfer, 2018, 127: 188-199. DOI:10.1016/j.ijheatmasstransfer.2018.08.041.
[24] Wang J B, Minelli G, Dong T Y, et al. Impact of the bogies and cavities on the aerodynamic behaviour of a high-speed train. An IDDES study[J]. Journal of Wind Engineering and Industrial Aerodynamics, 2020, 207: 104406. DOI:10.1016/j.jweia.2020.104406.
[25] Li X L, Chen G, Krajnovic S, et al. Numerical study of the aerodynamic performance of a train with a crosswind for different embankment heights[J]. Flow, Turbulence and Combustion, 2021, 107(1): 105-123. DOI:10.1007/s10494-020-00213-2.
[26] Su J, Lei H, Zhou D, et al. Aerodynamic noise assessment for a vertical axis wind turbine using improved delayed detached eddy simulation[J]. Renewable Energy, 2019, 141: 559-569. DOI:10.1016/j.renene.2019.04.038.
[27] Kang D G, Na H, Lee C Y. Detached eddy simulation of turbulent and thermal mixing in a T-junction[J]. Annals of Nuclear Energy, 2019, 124: 245-256. DOI:10.1016/j.anucene.2018.10.006.
[28] Zhang J X, Wang J, Fan X, et al. Detached-eddy simulation of turbulent coherent structures around groynes in a trapezoidal open channel[J]. Journal of Hydrodynamics, 2020, 32(2): 326-336. DOI:10.1007/s42241-019-0077-2.
[29] Kubacki S, Dick E. Hybrid RANS/LES of flow and heat transfer in round impinging jets[J]. International Journal of Heat and Fluid Flow, 2011, 32(3): 631-651. DOI:10.1016/j.ijheatfluidflow.2011.03.002.
[30] Kubacki S, Rokicki J, Dick E. Hybrid RANS/LES computations of plane impinging jets with DES and PANS models[J]. International Journal of Heat and Fluid Flow, 2013, 44: 596-609. DOI:10.1016/j.ijheatfluidflow.2013.08.014.
[31] Nosseir N S, Behar S. Characteristics of jet impingement in a side-dump combustor[J]. AIAA Journal, 1986, 24(11): 1752-1757. DOI:10.2514/3.9520.
[32] Miau J J, Sun D J, Yao L S. Streamwise vortices generated by impinging flows in a confined duct[J]. Experiments in Fluids, 1989, 7(7): 497-500. DOI:10.1007/BF00187069.
[33] Ahn K, Yoon Y. Characterization of side-dump combustor flowfield using particle image velocimetry[J]. Journal of Propulsion and Power, 2006, 22(3): 527-533. DOI:10.2514/1.20363.
[34] Gritskevich M S, Garbaruk A V, Schütze J, et al. Development of DDES and IDDES formulations for the k-ω shear stress transport model[J]. Flow, Turbulence and Combustion, 2012, 88(3): 431-449. DOI:10.1007/s10494-011-9378-4.
[35] Matsumura M, Antonia R A. Momentum and heat transport in the turbulent intermediate wake of a circular cylinder[J]. Journal of Fluid Mechanics, 1993, 250: 651-668. DOI:10.1017/s0022112093001600.
[36] Hussain A K M F, Reynolds W C. The mechanics of an organized wave in turbulent shear flow[J]. Journal of Fluid Mechanics, 1970, 41(2): 241-258. DOI:10.1017/s0022112070000605.
[37] 李伟锋, 孙志刚, 刘海峰, 等. 两喷嘴对置撞击流驻点偏移规律[J]. 化工学报, 2008, 59(1): 46-52. DOI:10.3321/j.issn: 0438-1157.2008.01.008.
[38] Li W F, Sun Z G, Liu H F, et al. Experimental and numerical study on stagnation point offset of turbulent opposed jets[J]. Chemical Engineering Journal, 2008, 138(1/2/3): 283-294. DOI:10.1016/j.cej.2007.05.039.
[39] Li W F, Yao T L, Wang F C. Study on factors influencing stagnation point offset of turbulent opposed jets[J]. AIChE Journal, 2010, 56(10): 2513-2522. DOI:10.1002/aic.12188.