Quadrant-Edge Orifice and Performance at Very High Reynolds Numbers

1966 ◽  
Vol 88 (1) ◽  
pp. 9-13 ◽  
Author(s):  
M. V. Ramamoorthy ◽  
K. Seetharamiah
Keyword(s):  
Experimental Investigation ◽  
Discharge Coefficient ◽  
Reynolds Numbers ◽  
Fluid Medium ◽  
High Reynolds Numbers ◽  
And Performance ◽  
High Reynolds ◽  
Coefficient Of Discharge ◽  
Very High

This paper presents the results of an experimental investigation on the discharge coefficient of a quadrant-edge orifice meter at high Reynolds numbers (in the range of 20,000 to 600,000). Results show that the coefficient of discharge can be related qualitatively with the drag of a cylinder in an infinite fluid medium. Results regarding upper constancy limit and reproducibility are also furnished.

Experimental Investigation of the Tip Vortex Influence on Viv of a Circular Cylinder at High Reynolds Numbers

2021 ◽  
Author(s):  
Mohamed Youssef ◽  
Simon T\xf6dter ◽  
Jens Neugebauer ◽  
Bettar El Moctar ◽  
Thomas E. Schellin
Keyword(s):  
Experimental Investigation ◽  
Circular Cylinder ◽  
Reynolds Numbers ◽  
Tip Vortex ◽  
High Reynolds Numbers ◽  
High Reynolds

Turbulent boundary layer statistics at very high Reynolds number

2015 ◽  
Vol 779 ◽  
pp. 371-389 ◽  
Author(s):  
M. Vallikivi ◽  
M. Hultmark ◽  
A. J. Smits
Keyword(s):  
Boundary Layer ◽  
Reynolds Number ◽  
High Reynolds Number ◽  
Reynolds Numbers ◽  
Working Fluid ◽  
Mean Velocity ◽  
High Reynolds Numbers ◽  
Layer Flow ◽  
High Reynolds ◽  
Very High

Measurements are presented in zero-pressure-gradient, flat-plate, turbulent boundary layers for Reynolds numbers ranging from $\mathit{Re}_{{\it\tau}}=2600$ to $\mathit{Re}_{{\it\tau}}=72\,500$ ($\mathit{Re}_{{\it\theta}}=8400{-}235\,000$). The wind tunnel facility uses pressurized air as the working fluid, and in combination with MEMS-based sensors to resolve the small scales of motion allows for a unique investigation of boundary layer flow at very high Reynolds numbers. The data include mean velocities, streamwise turbulence variances, and moments up to 10th order. The results are compared to previously reported high Reynolds number pipe flow data. For $\mathit{Re}_{{\it\tau}}\geqslant 20\,000$, both flows display a logarithmic region in the profiles of the mean velocity and all even moments, suggesting the emergence of a universal behaviour in the statistics at these high Reynolds numbers.

The Importance of Secondary Shedding in Two-Dimensional Wake Formation at Very High Reynolds Numbers

1982 ◽  
Vol 33 (2) ◽  
pp. 105-123 ◽  
Author(s):  
P.K. Stansby ◽  
A.G. Dixon
Keyword(s):  
Vortex Method ◽  
Reynolds Numbers ◽  
Discrete Vortex ◽  
Pressure Distributions ◽  
Pressure Fields ◽  
High Reynolds Numbers ◽  
First Approximation ◽  
High Reynolds ◽  
Very High ◽  
Good Agreement

SummaryUncertainties in the use of the discrete-vortex method in modelling the time development of the wake of a circular cylinder at very high Reynolds numbers are investigated. It is shown that simply introducing vorticity at generally accepted separation positions at a rate of ½Us2, Us being the velocity at separation, gives wholly unrealistic wake predictions. In the base region pressure fields occur which would promote separation in steady flow and so a first approximation for ‘secondary’ separation is incorporated into the model. This brings pressure distributions and vorticity structures at subcritical and supercritical Reynolds numbers into good agreement with experiment. The convection of the vortices is calculated using the cloud-in-cell technique and comparisons are made with direct summation methods.

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