Analysis of Fluid Flow through the Grinding Zone

1992 ◽  
Vol 114 (4) ◽  
pp. 427-434 ◽  
Author(s):  
C. Guo ◽  
S. Malkin
Keyword(s):  
Fluid Flow ◽  
Flow Rate ◽  
Tangential Velocity ◽  
Depth Of Penetration ◽  
Creep Feed ◽  
Useful Flow Rate ◽  
Useful Flow ◽  
Nozzle Position ◽  
Flow Through ◽  
Main Factors

A theoretical model of fluid flow in grinding has been developed by an analysis of fluid flow through a porous medium. Fluid tangential velocity, radial velocity, depth of penetration into the wheel, and the useful flow rate through the grinding zone are predicted by using this model. The analysis indicates that the nozzle position, nozzle velocity (or flow rate), and the effective wheel porosity are the three main factors which most significantly influence the useful flow rate through the grinding zone. A dimensionless effective wheel porosity parameter is introduced which is the ratio of the effective wheel porosity to its bulk porosity. By fitting the theoretical analysis to available experimental results, creep feed wheels were found to have much bigger dimensionless effective porosities than conventional wheels, which enhances their ability to more effectively pump fluid through the grinding zone.

Experimental Measurement of Fluid Flow Through the Grinding Zone

1992 ◽  
Vol 114 (1) ◽  
pp. 61-66 ◽  
Author(s):  
F. Engineer ◽  
C. Guo ◽  
S. Malkin
Keyword(s):  
Fluid Flow ◽  
Flow Rate ◽  
Depth Of Cut ◽  
Grinding Wheel ◽  
Surface Porosity ◽  
Test Rig ◽  
Useful Flow Rate ◽  
Useful Flow ◽  
Nozzle Position ◽  
Flow Through

An experimental test rig was developed to measure the amount of grinding fluid which flows through the grinding zone in straight plunge grinding. Proportional relationships were generally obtained between the flow rate from the nozzle and the useful flow rate of fluid passing through the grinding zone. The percentage of applied fluid passing through the grinding zone was found to depend mainly on the bulk porosity of the grinding wheel and the nozzle position. Wheel dressing has only a secondary influence, which is attributed to its influence on the surface porosity of the wheel. The workspeed and wheel depth of cut have virtually no influence.

On the Mechanism of Fluid Transport Across the Grinding Zone

1996 ◽  
Vol 118 (3) ◽  
pp. 332-338 ◽  
Author(s):  
C. C. Chang ◽  
S. H. Wang ◽  
A. Z. Szeri
Keyword(s):  
Flow Rate ◽  
Fluid Transport ◽  
Tangential Velocity ◽  
Hydrodynamic Pressure ◽  
Pressure Effects ◽  
Depth Of Penetration ◽  
Continuity Equations ◽  
Creep Feed ◽  
Ram Pressure ◽  
Flow Through

By considering both hydrodynamic pressure and ram pressure effects on flow through a porous wheel, we construct here a predictive model for calculating the flow-rate of the cooling fluid through the grinding zone. The hydrodynamic pressure is computed by means of a modified Reynolds equation, with upstream boundary conditions supplied by the ram pressure. To find the tangential velocity, the radial velocity, the depth of penetration of the fluid into the wheel, and the flow rate through the grinding zone, we solve momentum and continuity equations for flow through porous media. An empirical correlation for permeability, containing two dimensionless parameters, is employed to provide correction for wheel surface roughness, yielding theoretical results that show good agreement with experimental data for both conventional and creep feed grinding.

Study of fluid flow through a channel deformed by piezoelement

2018 ◽  
Vol 13 (3) ◽  
pp. 1-10 ◽  
Author(s):  
I.Sh. Nasibullayev ◽  
E.Sh Nasibullaeva ◽  
O.V. Darintsev
Keyword(s):  
Fluid Flow ◽  
Pressure Drop ◽  
Boundary Conditions ◽  
Flow Rate ◽  
Contact Surface ◽  
Piezoelectric Element ◽  
Neumann Boundary ◽  
Differential Pressure ◽  
Physical Parameters ◽  
Flow Through

The flow of a liquid through a tube deformed by a piezoelectric cell under a harmonic law is studied in this paper. Linear deformations are compared for the Dirichlet and Neumann boundary conditions on the contact surface of the tube and piezoelectric element. The flow of fluid through a deformed channel for two flow regimes is investigated: in a tube with one closed end due to deformation of the tube; for a tube with two open ends due to deformation of the tube and the differential pressure applied to the channel. The flow rate of the liquid is calculated as a function of the frequency of the deformations, the pressure drop and the physical parameters of the liquid.

Numerical Analysis of Flare Gas Recovery Ejector

2014 ◽  
Author(s):  
Arihant Sonawat ◽  
Abdus Samad ◽  
Afshin Goharzadeh
Keyword(s):  
Fluid Flow ◽  
Flow Rate ◽  
Oil And Gas ◽  
Oil And Gas Industry ◽  
Gas Industry ◽  
Gas Recovery ◽  
System A ◽  
Primary Fluid ◽  
Recovery System ◽  
Flow Through

Flaring and venting contributes significantly to greenhouse gas emissions and environmental pollution in the upstream oil and gas industry. Present work focuses on a horizontal flow, multiphase ejector used for recovery of these flared gases. The ejector typically handles these gases being entrained by high pressure well head fluid and a comprehensive understanding is necessary to design and operate such recovery system. A CFD based analysis of the flow through the ejector has been reported in this paper. The flow domain was meshed and the mass and momentum equations for fluid flow were solved using commercial software CFX (v14.5). Euler-Euler multiphase approach was used to model different phases. The entrainment behavior of the ejector was investigated and compared for different fluid flow conditions. It was observed that for a fixed primary fluid flow rate, the entrained or secondary flow rate decreased linearly with an increase in pressure difference between exit and suction pressure. The higher was primary flow rate, the greater was the suction created ahead of the primary nozzle and greater was the amount of energy added to the entrained fluid.

Fluid flow through the hydraulic resistance with a dynamically variable geometry

2017 ◽  
Vol 12 (1) ◽  
pp. 59-66 ◽  
Author(s):  
I.Sh. Nasibullayev ◽  
E.Sh. Nasibullaeva
Keyword(s):  
Fluid Flow ◽  
Hydraulic Resistance ◽  
Flow Rate ◽  
Dynamic Change ◽  
Variable Geometry ◽  
Transverse Compression ◽  
Flat Channel ◽  
Channel Geometry ◽  
Flow Through ◽  
Through Hole

In this paper the fluid flow in a flat channel with a hydraulic resistance is studied for two cases of a dynamic change in the channel geometry: transverse compression of the opening of the hydraulic resistance (the flow is caused by a pressure drop applied to the layer) and longitudinal movement of the hydraulic resistance along the channel (the flow is caused by this movement). It is obtained that in a geometry with transverse compression the flow is laminar without the formation of vortices. In a geometry with longitudinal movement of the hydraulic resistance the flow rate of the liquid remains constant with the formation of stable vortices that move along the channel at the rate of motion of the hydraulic resistance. On the base of the modeling results an analytical model that takes into account the flow rate of the fluid from the width of the through hole of the resistance is constructed. This model contains four interpolation parameters and it can be used as an element of a computational stand for determining the generalized flow of liquid in the system under consideration.

scholarly journals Effect of Swirl on Rotordynamic Forces Caused by Front Shroud Pump Leakage

2002 ◽  
Vol 124 (4) ◽  
pp. 1005-1010 ◽  
Author(s):  
Yun Hsu ◽  
Christopher E. Brennen
Keyword(s):  
Fluid Flow ◽  
Flow Rate ◽  
Leakage Flow ◽  
Unsteady Forces ◽  
Low Leakage ◽  
Leakage Path ◽  
Leakage Flow Rate ◽  
Inlet Swirl ◽  
Flow Through ◽  
Rotordynamic Forces

Unsteady forces generated by fluid flow through the impeller shroud leakage path of a centrifugal pump were investigated. The effect of leakage path inlet swirl (pump discharge swirl) on the rotordynamic forces was re-examined. It was observed that increasing the inlet swirl is destabilizing both for normal and tangential rotordynamic forces. Attempts to reduce the swirl within the leakage path using ribs and grooves as swirl brakes showed benefits only at low leakage flow rate.

Fluid-Induced Rotordynamic Instability in Rotary Atomizers

1989 ◽  
Vol 111 (2) ◽  
pp. 318-324
Author(s):  
J. Colding-Jorgensen
Keyword(s):  
Fluid Flow ◽  
Flow Rate ◽  
High Speed ◽  
Test Stand ◽  
Design Parameters ◽  
Rotordynamic Coefficients ◽  
Fluid Properties ◽  
Flow Through

A theory is presented for the calculation of rotordynamic coefficients for the fluid-rotor interaction in rotary atomizers, based on calculation of the fluid flow through a whirling atomizer wheel. The theory predicts potentially unstable rotor whirl in high-speed rotary atomizers. The whirl frequency can be that of the first critical forward or the first critical backward precession of the rotor, depending on atomizer wheel geometry, speed, fluid properties, and flow rate. The predicted whirl phenomena have been produced in an atomizer test stand. Both forward and backward precession have been observed to become unstable. The observed whirl directions and amplitudes are consistent with the calculated coefficients. Some design parameters are identified that can help control and suppress the whirl.

scholarly journals The influence of thermodynamic state of mineral hydraulic oil on flow rate through radial clearance at zero overlap inside the hydraulic components

2016 ◽  
Vol 20 (suppl. 5) ◽  
pp. 1461-1471 ◽  
Author(s):  
Darko Knezevic ◽  
Aleksandar Milasinovic ◽  
Zdravko Milovanovic ◽  
Sasa Lalos
Keyword(s):  
Fluid Flow ◽  
Physical Properties ◽  
Flow Rate ◽  
Mathematical Description ◽  
Radial Clearance ◽  
Model Description ◽  
Hydraulic Systems ◽  
Thermodynamic State ◽  
Valve Opening ◽  
Flow Through

In control hydraulic components (servo valves, LS regulators, etc.) there is a need for precise mathematical description of fluid flow through radial clearances between the control piston and body of component at zero overlap, small valve opening and small lengths of overlap. Such a mathematical description would allow for a better dynamic analysis and stability analysis of hydraulic systems. The existing formulas in the literature do not take into account the change of the physical properties of the fluid with a change of thermodynamic state of the fluid to determine the flow rate through radial clearances in hydraulic components at zero overlap, a small opening, and a small overlap lengths, which leads to the formation of insufficiently precise mathematical models. In this paper model description of fluid flow through radial clearances at zero overlap is developed, taking into account the changes of physical properties of hydraulic fluid as a function of pressure and temperature. In addition, the experimental verification of the mathematical model is performed.

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