Application of CFD to model oil–air flow in a grooved two-disc system

Abstract The flow field of an open grooved two-disc system was studied. The system includes a rotating finite disc and a stationary finite disc. The rotating disc has radial grooves. The numerical results for the air–oil two-phase flow inside the open grooved two-disc system calculated by the CFD code FLUENT were proposed. The results are discussed and compared with the published test results. The results indicate that the groove affects the transitional characteristics from a single-phase flow to an air–oil two-phase flow of the flow field. In the same flow area, the radial oil flow coefficient is enhanced with a larger groove number. The oil mainly discharges through the groove and the air flows into the non-grooved area from the upstream side of the groove. The effects of the angular velocity on the oil volume fraction and the drag torque become greater when the disc is grooved. It is weakened in the high-velocity operations. The drag torque can be reduced by increasing the groove number in the same flow area. The axial force applied on the disc is gradually decreased with the increase of the angular velocity and becomes close to zero finally. The increase of the groove number reduces the maximum axial force. The results can be used for the optimisation of the Tesla pump and wet clutch.

[1]  D. D. Col,et al.  Numerical Simulation of Laminar Liquid Film Condensation in a Horizontal Circular Minichannel , 2012 .

[2]  Jc Jaap Schouten,et al.  Boundary layer development in the flow field between a rotating and a stationary disk , 2012 .

[3]  Y. Takeda,et al.  Spiral and circular waves in the flow between a rotating and a stationary disk , 1999 .

[4]  W. Cochran.  The flow due to a rotating disc , 1934, Mathematical Proceedings of the Cambridge Philosophical Society.

[5]  Bruce K. Gale,et al.  Single-disk and double-disk viscous micropumps , 2005 .

[6]  Lionel Schouveiler,et al.  Stability of a traveling roll system in a rotating disk flow , 1998 .

[7]  Izhak Etsion,et al.  Stiffness and Efficiency Optimization of a Hydrostatic Laser Surface Textured Gas Seal , 2007 .

[8]  K. Stewartson.  On the flow between two rotating coaxial disks , 1953, Mathematical Proceedings of the Cambridge Philosophical Society.

[9]  F. Marques,et al.  Crossflow instability of finite Bödewadt flows: Transients and spiral waves , 2009 .

[10]  T. Kármán.  Über laminare und turbulente Reibung , 1921 .

[11]  Henry Hiraki,et al.  Modeling and Parametric Study of Torque in Open Clutch Plates , 2006 .

[12]  J. Lopez.  Characteristics of endwall and sidewall boundary layers in a rotating cylinder with a differentially rotating endwall , 1998, Journal of Fluid Mechanics.

[13]  S. MacGregor,et al.  Experimental study of the flow in the cavity between rotating disks , 1993 .

[15]  A. Luo,et al.  Airflow pressure and shear forces on a rotating, deformed disk in an open shroud , 2004 .

[16]  Alexei Lapin,et al.  Numerical simulation of the dynamics of two-phase gasliquid flows in bubble columns , 1994 .

[17]  I. Etsion.  State of the art in Laser Surface Texturing , 2004 .

[18]  C. W. Hirt,et al.  Volume of fluid (VOF) method for the dynamics of free boundaries , 1981 .

[19]  G. Batchelor.  NOTE ON A CLASS OF SOLUTIONS OF THE NAVIER-STOKES EQUATIONS REPRESENTING STEADY ROTATIONALLY-SYMMETRIC FLOW , 1951 .

[20]  Louis J. Durlofsky,et al.  On rotating disk flow , 1987, Journal of Fluid Mechanics.

[21]  Hiromu Hashimoto,et al.  Optimization of Groove Geometry for Thrust Air Bearing to Maximize Bearing Stiffness , 2008 .

[22]  Hisanao Kitabayashi,et al.  Analysis of the Various Factors Affecting Drag Torque in Multiple-Plate Wet Clutches , 2003 .

[23]  N. Saniei,et al.  Turbulent heat transfer on the stationary disk in a rotor-stator system , 2003 .

[24]  R. E. Nece,et al.  Chamber Dimension Effects on Induced Flow and Frictional Resistance of Enclosed Rotating Disks , 1960 .

[25]  Rong Fung Huang,et al.  Turbulent flow of quadrangle mode in interdisk midplane between two shrouded co-rotating disks , 2011 .

[26]  A. S. Mujumdar,et al.  Simulation of a Spray Dryer Fitted with a Rotary Disk Atomizer Using a Three-Dimensional Computional Fluid Dynamic Model , 2004 .

[27]  P. Woodward,et al.  SLIC (Simple Line Interface Calculation) , 1976 .

[28]  M Fesanghary,et al.  On the modeling and shape optimization of hydrodynamic flexible-pad thrust bearings , 2013 .

[29]  Eysion A. Liu,et al.  An Improved Hydrodynamic Model for Open Wet Transmission Clutches , 2007 .

[30]  Jibin Hu,et al.  Study on Aeration for Disengaged Wet Clutches Using a Two-Phase Flow Model , 2010 .

[31]  Izhak Etsion,et al.  Analytical and Experimental Investigation of Laser-Textured Mechanical Seal Faces , 1999 .

[32]  M. Mohammadi,et al.  Direct numerical simulation of water droplet coalescence in the oil , 2012 .

[33]  E. Ng.  Structure Optimization Study of Hard Disk Drives to Reduce Flow- Induced Vibration , 2011 .

[34]  J. Sethian,et al.  Fronts propagating with curvature-dependent speed: algorithms based on Hamilton-Jacobi formulations , 1988 .

[35]  Gerhart Eigenberger,et al.  Gas—liquid flow in bubble columns and loop reactors: Part I. Detailed modelling and numerical simulation , 1994 .

[36]  Jibin Hu,et al.  Numerical investigation of the air–oil two-phase flow inside an oil-jet lubricated ball bearing , 2014 .

[37]  K. Aruga,et al.  A Study on Positioning Error Caused by Flow Induced Vibration Using Helium-Filled Hard Disk Drives , 2007, IEEE Transactions on Magnetics.

[38]  Abhijit Guha,et al.  A theory of Tesla disc turbines , 2012 .

[39]  Norio Takakura,et al.  Multiphase Drag Modeling for Prediction of the Drag Torque Characteristics in Disengaged Wet Clutches , 2014 .

[40]  Everhardus Albertus Muijderman,et al.  SPIRAL GROOVE BEARINGS , 1965 .

[41]  M. Wörner.  Numerical modeling of multiphase flows in microfluidics and micro process engineering: a review of methods and applications , 2012 .

[42]  C. Soong,et al.  Flow structure between two co-axial disks rotating independently , 2003 .

[43]  F. Al-Bender,et al.  Model for Predicting Drag Torque in Open Multi-Disks Wet Clutches , 2014 .