Computational and Experimental Fluid Dynamics of Jet Loop Reactor

A computational analysis using standard k-e model, RSM and LES has been carried out for jet loop reactors (JLR) to investigate the mean and turbulence quantities. These simulations have revealed that the flow in JLR was different from the self-similar round jets. RSM and LES showed better agreement with PIV measurements compared with standard k-e model. The modeled turbulence production and transport in k-e model overpredicted those estimated from LES data. To reduce the limitations, modified k-e models have been evaluated for JLR. Also, a hybrid k-e model has been suggested, which was found to perform better than other modified k-e models. This model was also found to hold for stirred tank reactors (STRs). Mixing time analysis has been carried out for JLR and STR at same power consumption. It has been shown that JLR can be inferior to STR if proper nozzle diameter is not selected.

[1]  Jyeshtharaj B. Joshi,et al.  Simulation of Flow in Stirred Vessels with Axial Flow Impellers: Effects of Various Numerical Schemes and Turbulence Model Parameters , 1995 .

[2]  B. R. Sehgal,et al.  Experimental and analytical studies of melt jet-coolant interactions: a synthesis , 1999 .

[3]  S. Pope.  Turbulent Flows: FUNDAMENTALS , 2000 .

[4]  J. Lumley,et al.  Turbulence measurements in axisymmetric jets of air and helium. Part 1. Air jet , 1993, Journal of Fluid Mechanics.

[5]  Ashwin W. Patwardhan,et al.  CFD modeling of jet mixed tanks , 2002 .

[6]  B. Launder,et al.  The numerical computation of turbulent flows , 1990 .

[7]  Vivek V. Ranade,et al.  Towards better mixing protocols by designing spatially periodic flows: The case of a jet mixer , 1996 .

[8]  H. Usui,et al.  TURBULENCE STRUCTURE OF SUBMERGED JETS OF DILUTE POLYMER SOLUTIONS , 1980 .

[9]  Toshiro Maruyama,et al.  JET MIXING OF FLUIDS IN TANKS , 1982 .

[10]  Suresh Menon,et al.  Application of the localized dynamic subgrid-scale model to turbulent wall-bounded flows , 1997 .

[11]  S. G. Bankoff,et al.  Large‐scale turbulence characteristics of a submerged water jet , 1963 .

[12]  E. Lindborg,et al.  CORRECTION TO THE FOUR-FIFTHS LAW DUE TO VARIATIONS OF THE DISSIPATION , 1999 .

[13]  J. Joshi,et al.  Evaluation of Local Turbulent Energy Dissipation Rate using PIV in Jet Loop Reactor , 2009 .

[14]  Jyeshtharaj B. Joshi,et al.  Axial mixing in pipe flows: turbulent and transition regions , 2003 .

[15]  B. Ilyushin,et al.  Large eddy simulation of the turbulent round jet dynamics , 2006 .

[16]  C. Meneveau,et al.  Decaying turbulence in an active-grid-generated flow and comparisons with large-eddy simulation , 2003, Journal of Fluid Mechanics.

[17]  Sreenivas Jayanti,et al.  Hydrodynamics of jet mixing in vessels , 2001 .

[18]  C. Fonade,et al.  Experimental study of mixing performances using steady and unsteady jets , 1993 .

[19]  Jyeshtharaj B. Joshi,et al.  MOMENTUM, MASS AND HEAT TRANSFER IN SINGLE-PHASE TURBULENT FLOW , 2002 .

[20]  L. Forney,et al.  Eddy contact model: CFD simulations of liquid reactions in nearly homogeneous turbulence , 2000 .

[21]  William K. George,et al.  Velocity measurements in a high-Reynolds-number, momentum-conserving, axisymmetric, turbulent jet , 1994, Journal of Fluid Mechanics.

[22]  C. Meneveau,et al.  On the properties of similarity subgrid-scale models as deduced from measurements in a turbulent jet , 1994, Journal of Fluid Mechanics.

[23]  John R. Bourne,et al.  Investigation of mixing in jet reactors using fast, competitive—consecutive reactions , 1994 .

[24]  L. Brooker,et al.  Mixing with the jet set , 1993 .

[25]  Brian Launder,et al.  SECOND-MOMENT CLOSURE AND ITS USE IN MODELLING TURBULENT INDUSTRIAL FLOWS , 1989 .

[26]  Branislav Basara,et al.  A new hybrid turbulence modelling strategy for industrial CFD , 2003 .

[27]  Stephen B. Pope,et al.  An explanation of the turbulent round-jet/plane-jet anomaly , 1978 .