Velocity Profile Effects on the Discharge Coefficient of Pressure-Differential Meters

1963 ◽  
Vol 85 (3) ◽  
pp. 338-342 ◽  
Author(s):  
A. G. Ferron
Keyword(s):  
Velocity Profile ◽  
Velocity Distribution ◽  
Discharge Coefficient ◽  
Pressure Differential ◽  
Characteristic Manner

Tests performed on a high-differential meter, venturi meter, and orifice indicated changes in the discharge coefficient with changes in upstream velocity distribution. These tests along with those by other investigators lead to the conclusion that all pressure-differential meters are affected by upstream velocity distributions when defined in some characteristic manner. This effect is increased as the beta ratio increases.

Quadrant Edge Orifice Performance-Effect of Upstream Velocity Distribution

1962 ◽  
Vol 84 (4) ◽  
pp. 415-418 ◽  
Author(s):  
Marvin Bogema ◽  
Bradford Spring ◽  
M. V. Ramamoorthy
Keyword(s):  
Reynolds Number ◽  
Velocity Profile ◽  
Velocity Distribution ◽  
Lower Limit ◽  
Discharge Coefficient ◽  
Reynolds Numbers ◽  
Experimental Results ◽  
Performance Effect ◽  
Coefficient Variation ◽  
Discharge Coefficients

Quadrant edge orifices offer constant discharge coefficients to much lower Reynolds numbers than do sharp edge orifices, nozzles, or venturi meters. Published results show different values for the lower limit of constancy. This paper presents experimental results which indicate that at flows below pipe Reynolds number of 4000 the discharge coefficient variation is related to the degree of velocity profile development in the upstream meter run.

scholarly journals The Dynamics of the Amery Ice Shelf

1966 ◽  
Vol 6 (45) ◽  
pp. 335-358 ◽  
Author(s):  
W. Budd
Keyword(s):  
Velocity Profile ◽  
Velocity Distribution ◽  
Power Flow ◽  
Stress Distributions ◽  
Ice Shelf ◽  
General Survey ◽  
Mass Budget ◽  
Preliminary Results ◽  
Amery Ice Shelf ◽  
Theoretical Considerations

A general survey of the preliminary results of a three-year program of measurements on the Amery Ice Shelf by A.N.A.R.E. are presented, together with theoretical considerations of the velocity and stress distributions and the mass and energy regimes of the ice shelf. In order to explain the observed velocity distribution it has been found necessary to extend Weertman’s theory of ice-shelf creep to an ice shelf bounded at its sides. The resulting theoretical velocity profile applied to the results of the Amery Ice Shelf provides estimates of the average values of the power flow-law parameters for the ice shelf. The energy and mass budget considerations, together with the recorded change in form of the ice front, suggest that the ice-shelf regime is not in a continual state of balance but may fluctuate as the ice shelf changes in form over a period of about forty years.

In-Cylinder Flow Correlations Between Steady Flow Bench and Motored Engine Using Computational Fluid Dynamics

2017 ◽  
Vol 139 (7) ◽  
Author(s):  
Xiaofeng Yang ◽  
Tang-Wei Kuo ◽  
Orgun Guralp ◽  
Ronald O. Grover ◽  
Paul Najt
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Steady State ◽  
Velocity Profile ◽  
Discharge Coefficient ◽  
Intake Port ◽  
Charge Motion ◽  
Steady State Flow ◽  
Cfd Simulations ◽  
Motored Engine

Intake port flow performance plays a substantial role in determining the volumetric efficiency and in-cylinder charge motion of a spark-ignited engine. Steady-state flow bench and motored engine flow computational fluid dynamics (CFD) simulations were carried out to bridge these two approaches for the evaluation of port flow and charge motion (such as discharge coefficient, swirl/tumble ratios (SR/TR)). The intake port polar velocity profile and polar physical clearance profile were generated to evaluate the port performance based on local flow velocity and physical clearance in the valve-seat region. The measured data were taken from standard steady-state flow bench tests of an intake port for validation of CFD simulations. It was reconfirmed that the predicted discharge coefficients and swirl/tumble index (SI/TI) of steady flow bench simulations have a good correlation with those of motored engine flow simulations. Polar velocity profile is strongly affected by polar physical clearance profile. The polar velocity inhomogeneity factor (IHF) correlates well with the port discharge coefficient, swirl/tumble index. Useful information can be extracted from local polar physical clearance and velocity, which can help for intake port design.

scholarly journals Analysis of the velocity distribution in different types of ventilation system ducts

2018 ◽  
Vol 180 ◽  
pp. 02081 ◽  
Author(s):  
Kazimierz Peszyński ◽  
Lukasz Olszewski ◽  
Emil Smyk ◽  
Daniel Perczyński
Keyword(s):  
Velocity Profile ◽  
Velocity Distribution ◽  
Cross Section ◽  
Power Law ◽  
Flow Rate ◽  
Fundamental Problem ◽  
Ventilation System ◽  
Different Types ◽  
Actual Profile ◽  
Ventilation Duct

The paper presents the results obtained during the preliminary studies of circular and rectangular ducts before testing the properties elements (elbows, tees, etc.)of rectangular with rounded corners ducts. The fundamental problem of the studies was to determine the flow rate in the ventilation duct. Due to the size of the channel it was decided to determine the flow rate based on the integration of flow velocity over the considered cross-section. This method requires knowledge of the velocity distribution in the cross section. Approximation of the measured actual profile by the classic and modified Prandtl power-law velocity profile was analysed.

Sign in / Sign up

Export Citation Format

Share Document