Grinding Fluid Flow Field Modeling and Multi-Parameter Numerical Analysis Based on Smooth Model

2010 ◽  
Vol 156-157 ◽  
pp. 948-955
Author(s):  
Guang Yao Meng ◽  
Ji Wen Tan ◽  
Yi Cui
Keyword(s):  
Fluid Flow ◽  
Numerical Analysis ◽  
Flow Field ◽  
Dynamic Pressure ◽  
Grinding Wheel ◽  
Lubricating Film ◽  
Fluid Field ◽  
Grinding Fluid ◽  
Smooth Model ◽  
Area Increase

Relative motion between grinding wheel and workpiece makes the lubricant film pressure formed by grinding fluid in the grinding area increase, consequently, dynamic pressure lubrication forms. The grinding fluid flow field mathematical model in smooth grinding area is established based on lubrication theory. The dynamic pressure of grinding fluid field, flow velocity and carrying capacity of lubricating film are calculated by the numerical analysis method. An analysis of effect of grinding fluid hydrodynamic on the total lifting force is performed, and the results are obtained.

Analysis of Transitional Flow in Tube Based on PIV

2014 ◽  
Vol 574 ◽  
pp. 485-488
Author(s):  
Jun Wang ◽  
Guang Sheng Du ◽  
Yong Hui Liu
Keyword(s):  
Boundary Layer ◽  
Reynolds Number ◽  
Fluid Flow ◽  
Flow Field ◽  
Velocity Distribution ◽  
Axial Velocity ◽  
Transitional Flow ◽  
Experimental Result ◽  
Fluid Field ◽  
Normal Speed

In order to get the situation of transitional flow in tube, we tested the fluid field by PIV experiment and acquired the velocity distribution of the flow field at different Reynolds number (Re=2400 and Re=3000). At the same time the structure and characteristics of the flow field were obtained. The experimental result shows that the change of axial velocity in boundary layer is not obvious at low Reynolds number, the fluctuation of axial velocity appears and normal speed changes a little in mainstream area. With the increase of Reynolds number the axial velocity both in boundary layer and mainstream area change obviously, pulsation of the normal speed increases, the state of fluid flow gradually evolves from laminar to transitional flow.

Stator Temperature Distribution of AC Machine Based on Fluid Flow Field

2013 ◽  
Vol 313-314 ◽  
pp. 27-30
Author(s):  
Cong Hui Huang ◽  
Xin Zhen Wu
Keyword(s):  
Fluid Flow ◽  
Flow Field ◽  
Cooling System ◽  
Three Dimensional ◽  
Temperature Fields ◽  
Transfer Coefficients ◽  
Safe Operation ◽  
Heat Transfer Coefficients ◽  
Fluid Field ◽  
Ventilation Ducts

In order to study the impacts of the stator ventilation structure on the thermal performance, the fluid flow model of the stator radial ventilation ducts is established. The fluid flow fields are calculated and analyzed, from which the three-dimensional fluid field distribution inside the radial ventilation ducts is shown. Subsequently, the heat transfer coefficients are obtained on the basis of calculated results of the fluid flow field, and the stator three-dimensional temperature fields are solved. The numerical results are compared among different inlet velocities at the entrance of the radial ventilation ducts, which provides a theory basis for the design of the cooling system and improves the safe operation level of the generator.

Numerical Analysis of the Flow Field Within Lip Seals Containing Microundulations

1992 ◽  
Vol 114 (3) ◽  
pp. 485-491 ◽  
Author(s):  
R. F. Salant
Keyword(s):  
Numerical Analysis ◽  
Flow Field ◽  
Shear Deformation ◽  
Leakage Rate ◽  
Shaft Speed ◽  
Rotating Shaft ◽  
Lip Seal ◽  
Lubricating Film ◽  
Lip Seals

The flow field within the lubricating film of a rotating shaft lip seal containing microundulations is analyzed numerically. The results demonstrate that the action of the microundulations can prevent leakage through the seal. The effects on leakage rate of shaft speed, undulation amplitude and wavelength, shear deformation of the undulations, flattening of the undulations, and axial lip profile are presented.

Fluid Flow and Pressure in the Grinding Wheel-Workpiece Interface

2005 ◽  
Vol 127 (1) ◽  
pp. 198-205 ◽  
Author(s):  
Vladimir Gviniashvili ◽  
John Webster ◽  
Brian Rowe
Keyword(s):  
Boundary Layer ◽  
Fluid Flow ◽  
Flow Rate ◽  
Atmospheric Pressure ◽  
Fluid Pressure ◽  
Grinding Wheel ◽  
Fluid Density ◽  
Empirical Coefficient ◽  
Grinding Fluid ◽  
Abrasive Property

A model is presented for flow of grinding fluid through the grinding zone. It was found that the flow rate through the contact zone between the wheel and the workpiece is a function of fluid pressure in the grinding zone, delivery flow rate, fluid density, and wheel velocity. An empirical coefficient of value less than 1 is introduced. The coefficient depends on wheel geometry, jet velocity, abrasive property, and fluid property. Air flow interfering with the delivery grinding fluid is also analyzed. A relationship was found between atmospheric pressure and the retention of fluid particles in the boundary layer on the wheel periphery. The model was tested for both porous and impervious wheels.

Numerical Analysis of Grinding Fluid Field in Grinding

2010 ◽  
Vol 97-101 ◽  
pp. 2944-2950
Author(s):  
Guang Yao Meng ◽  
Ji Wen Tan ◽  
Shan Shan Shang ◽  
Chang He Li
Keyword(s):  
Mathematical Model ◽  
Multigrid Method ◽  
Hydrodynamic Lubrication ◽  
Hydrodynamic Pressure ◽  
Grinding Wheel ◽  
Fluid Field ◽  
Grinding Fluid ◽  
Crude Model ◽  
Hydrodynamic Lubrication Theory ◽  
Good Agreement

Based on hydrodynamic lubrication theory, a mathematical model of grinding fluid field in flood is sets up in this paper. Hydrodynamic pressure and velocity of grinding fluid are calculated by multigrid method. Additionally, crude model about the coarseness of grinding wheel and workpiece is built on the basis of slick model and solutions are obtained by multigrid method. Solutions of slick model and crude model are compared. Result shows that the solution of slick model is in good agreement with the crude model and verifies the experimental analysis.

Simulation on Characteristics of Grinding Fluid Jet Based on FLUENT

2011 ◽  
Vol 697-698 ◽  
pp. 19-23
Author(s):  
Cai Xia Chao ◽  
Shao Yong Pei ◽  
Ji Man Luo ◽  
Shi Chao Xiu
Keyword(s):  
Contact Area ◽  
Jet Flow ◽  
Grinding Wheel ◽  
Phase Flow ◽  
Two Phase ◽  
Flow Area ◽  
The Real ◽  
Outlet Pressure ◽  
Fluid Field ◽  
Grinding Fluid

The grinding fluid has the function of cooling and lubricating only when it breaks through the airflow barrier near the grinding wheel and enters into the contact area between the grinding wheel and the workpiece. The air-fluid two-phase flow software is used to simulate the characteristics of the grinding fluid field based on VOF, and the special constraint conditions of the outlet pressure are not applied in simulation. The characteristics of the grinding fluid jet and the real moving characteristics of the grinding fluid between the jet flow area and the grinding area are analyzed. It provides the research foundation for the parameters of the grinding fluid supplying.

NUMERICAL ANALYSIS OF NEWTONIAN FLUID FLOW VARYING THE CONTRACTION GEOMETRY USING OPENFOAM

2019 ◽  
Author(s):  
João Pedro Costa Eliziário ◽  
andrevidy honório ◽  
Marcos Lourenço ◽  
Elie Luis Martínez Padilla
Keyword(s):  
Fluid Flow ◽  
Numerical Analysis ◽  
Newtonian Fluid
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