Mixing Enhancement in a Coaxial Jet Mixer
Affiliation(s)
Rostock University Department of Technical Thermodynamics 18059 Rostock, Germany. Rostock University Department of Technical Thermodynamics 18059 Rostock, Germany.
Rostock University Department of Technical Thermodynamics 18059 Rostock, Germany. Rostock University Department of Technical Thermodynamics 18059 Rostock, Germany.
ABSTRACT
Experimental investigations of mixing in a coaxial jet mixer have been carried out applying Particle Image Velocimetry (PIV) and Planar Laser Induced Fluorescence (PLIF) methods simultaneously. A developed turbulent jet of an aqueous solution of Rhodamine 6G issued from the nozzle was mixed with co-flow water. Velocity and scalar fields were studied quite far downstream flow to control the formation of a quasi homogeneous mixture. The intensity of mixing was varied by mouthpieces with rectangular and triangular vortex generators of different sizes installed in the nozzle. The formation length of the quasi homogeneous mixture was reduced about 10 jet diameters by the tabs. The triangular tabs were more effective than the rectangular ones.
Experimental investigations of mixing in a coaxial jet mixer have been carried out applying Particle Image Velocimetry (PIV) and Planar Laser Induced Fluorescence (PLIF) methods simultaneously. A developed turbulent jet of an aqueous solution of Rhodamine 6G issued from the nozzle was mixed with co-flow water. Velocity and scalar fields were studied quite far downstream flow to control the formation of a quasi homogeneous mixture. The intensity of mixing was varied by mouthpieces with rectangular and triangular vortex generators of different sizes installed in the nozzle. The formation length of the quasi homogeneous mixture was reduced about 10 jet diameters by the tabs. The triangular tabs were more effective than the rectangular ones.
Cite this paper
V. Zhdanov and E. Hassel, "Mixing Enhancement in a Coaxial Jet Mixer," Advances in Materials Physics and Chemistry, Vol. 2 No. 4, 2012, pp. 134-137. doi: 10.4236/ampc.2012.24B035.
V. Zhdanov and E. Hassel, "Mixing Enhancement in a Coaxial Jet Mixer," Advances in Materials Physics and Chemistry, Vol. 2 No. 4, 2012, pp. 134-137. doi: 10.4236/ampc.2012.24B035.
References
[1] K. B. M. Q. Zaman, “Spreading characteristics of compressible jets from nozzles of various geometries”, J. Fluid Mech. vol. 383, pp. 197-228, 1999 [2] S. C. M. Yu, L. P. Chua, and X. K. Wang, “Measurements in the Near Field of a Confined Coaxial Square Jet”, AIAA J. vol. 42, pp.61-69, January 2004 [3] W. R. Quinn, “Near-Field Measurements in an Equilatera Triangular Turbulent Free jet”, AIAA J. vol. 43, pp. 2574-2585, December 2005 [4] D. E. Nikitopoulos, J. W. Bitting, B. Rouge, and S. Gogineni, “Comparisons of Initially Turbulent, Low-Velocity-Ratio Circular and Square Coaxial Jets”, AIAA J. vol. 41, , pp.230-239, February 2003 [5] L. L.Smith, A. J. Majamaki, I. T. Lam, O Delabroy, A. R.Karagozian, F. E Marble, and O. I.Smith, “Mixing Enhancement in a Lobed Injector,” Phys. Fluids, vol. 9, pp. 667–678, 1997 [6] A. J. Majamaki, O. I. Smith, and A. R. Karagozian, “Passive Mixing Control via Lobed Injectors in High-Speed Flow”, AIAA J. vol. 41, pp 623-632, April 2003 [7] L. J. S. Bradbury and A. H. Khadem, “The distortion of a jet by tabs”, J. Fluid Mech. vol. 70, pp. 801-813, 1975 [8] M. Samimy, K. B. M. Q. Zaman and M. F. Reeder, “Effect of Tabs on the Flow and Noise Field of an Axisymmetric Jet”, AIAA J. vol. 31, pp. 609-619, April 1993 [9] M. Q. Zaman, M. F. Reeder and M. Samimy, “Control of an axisymmetric jet using vortex generators”, Phys. Fluids, vol. 6, pp. 778-794, February 1994 [10] M. F. Reeder and M. Samimy, “The evolution of a jet with vortex-generating tabs: real-time visualization and quantitative measurements”, J. Fluid Mech. vol. 311, pp. 73-118, 1996 [11] J. K. Foss, K.B.M.Q. Zaman, “Large- and small scale vertical motion in a shear layer perturbed by tabs”, J. Fluid Mech. vol. 382, pp. 307-329, 1999 [12] S. C. M. Yu and P. K. Koh, “Experimental Investigation of Two-Stream Mixing Flow with Multiple Tabs”, AIAA J. vol. 39, pp. 996-1005, June 2001 [13] V. Zhdanov, N. Kornev, E.Hassel and A. Chorny, “Mixing of confined coaxial flows”, Int. J. Heat and Mass Transfer, pp. 3942-3956, 2006
[1] K. B. M. Q. Zaman, “Spreading characteristics of compressible jets from nozzles of various geometries”, J. Fluid Mech. vol. 383, pp. 197-228, 1999 [2] S. C. M. Yu, L. P. Chua, and X. K. Wang, “Measurements in the Near Field of a Confined Coaxial Square Jet”, AIAA J. vol. 42, pp.61-69, January 2004 [3] W. R. Quinn, “Near-Field Measurements in an Equilatera Triangular Turbulent Free jet”, AIAA J. vol. 43, pp. 2574-2585, December 2005 [4] D. E. Nikitopoulos, J. W. Bitting, B. Rouge, and S. Gogineni, “Comparisons of Initially Turbulent, Low-Velocity-Ratio Circular and Square Coaxial Jets”, AIAA J. vol. 41, , pp.230-239, February 2003 [5] L. L.Smith, A. J. Majamaki, I. T. Lam, O Delabroy, A. R.Karagozian, F. E Marble, and O. I.Smith, “Mixing Enhancement in a Lobed Injector,” Phys. Fluids, vol. 9, pp. 667–678, 1997 [6] A. J. Majamaki, O. I. Smith, and A. R. Karagozian, “Passive Mixing Control via Lobed Injectors in High-Speed Flow”, AIAA J. vol. 41, pp 623-632, April 2003 [7] L. J. S. Bradbury and A. H. Khadem, “The distortion of a jet by tabs”, J. Fluid Mech. vol. 70, pp. 801-813, 1975 [8] M. Samimy, K. B. M. Q. Zaman and M. F. Reeder, “Effect of Tabs on the Flow and Noise Field of an Axisymmetric Jet”, AIAA J. vol. 31, pp. 609-619, April 1993 [9] M. Q. Zaman, M. F. Reeder and M. Samimy, “Control of an axisymmetric jet using vortex generators”, Phys. Fluids, vol. 6, pp. 778-794, February 1994 [10] M. F. Reeder and M. Samimy, “The evolution of a jet with vortex-generating tabs: real-time visualization and quantitative measurements”, J. Fluid Mech. vol. 311, pp. 73-118, 1996 [11] J. K. Foss, K.B.M.Q. Zaman, “Large- and small scale vertical motion in a shear layer perturbed by tabs”, J. Fluid Mech. vol. 382, pp. 307-329, 1999 [12] S. C. M. Yu and P. K. Koh, “Experimental Investigation of Two-Stream Mixing Flow with Multiple Tabs”, AIAA J. vol. 39, pp. 996-1005, June 2001 [13] V. Zhdanov, N. Kornev, E.Hassel and A. Chorny, “Mixing of confined coaxial flows”, Int. J. Heat and Mass Transfer, pp. 3942-3956, 2006