Theoretical determination of the coordinates of inlets of bottom conduits with rectangular cross section and horizontal bottom

1971 ◽  
Vol 5 (2) ◽  
pp. 158-161
Author(s):  
N. Ya. Konakhovich
Keyword(s):  
Cross Section ◽  
Rectangular Cross Section ◽  
Theoretical Determination ◽  
Horizontal Bottom

The Uniform Flexure of an Incomplete Tore

1949 ◽  
Vol 2 (4) ◽  
pp. 469
Author(s):  
W Freiberger ◽  
RCT Smith
Keyword(s):  
General Solution ◽  
Cross Section ◽  
Harmonic Functions ◽  
Rectangular Cross Section ◽  
Three Dimensional ◽  
Elasticity Problems ◽  
Three Dimensional Elasticity ◽  
Derivatives Of ◽  
Special Case

In this paper we discuss the flexure of an incomplete tore in the plane of its circular centre-line. We reduce the problem to the determination of two harmonic functions, subject to boundary conditions on the surface of the tore which involve the first two derivatives of the functions. We point out the relation of this solution to the general solution of three-dimensional elasticity problems. The special case of a narrow rectangular cross-section is solved exactly in Appendix II.

FLOW MODIFICATION INDUCED BY QUINCKE ROTATION IN A CAPILLARY

2002 ◽  
Vol 16 (17n18) ◽  
pp. 2603-2609 ◽  
Author(s):  
A. CEBERS ◽  
E. LEMAIRE ◽  
L. LOBRY
Keyword(s):  
Cross Section ◽  
Flow Rate ◽  
Effective Viscosity ◽  
Rectangular Cross Section ◽  
Colloidal Suspension ◽  
Direct Determination ◽  
Flow Modification ◽  
Insulating Liquid ◽  
Quincke Rotation

When particles immersed in a semi-insulating liquid are submitted to a sufficiently high DC field, they can rotate spontaneously around any axis perpendicular to the field (Quincke rotation). Recently we have shown that due to Quincke effect the effective viscosity of a colloidal suspension could be reduced. When the suspension is submitted to a shear, the particles rotation is amplified by the electric torque and drives the suspending liquid. For a flow in a capillary, this effect manifests itself by an increase of the flow rate. We present the results of our experiments carried out with a rectangular cross section capillary. These results are compared with the direct determination of the apparent viscosity in a Couette flow rheometer.

scholarly journals Spectral Analysis of Pressure, Noise and Vibration Velocity Measurement in Cavitation

2017 ◽  
Vol 17 (6) ◽  
pp. 250-256 ◽  
Author(s):  
Jana Jablonská ◽  
Miroslav Mahdal ◽  
Milada Kozubková
Keyword(s):  
Experimental Investigation ◽  
Cross Section ◽  
Noise Intensity ◽  
Structural Changes ◽  
Rectangular Cross Section ◽  
Vibration Velocity ◽  
Nozzle Wall ◽  
Air Flow Rate ◽  
Laboratory Equipment

Abstract The article deals with experimental investigation of water cavitation in the convergent-divergent nozzle of rectangular cross-section. In practice, a quick and simple determination of cavitation is essential, especially if it is basic cavitation or cavitation generated additionally by the air being sucked. Air influences the formation, development and size of the cavity area in hydraulic elements. Removal or reduction of the cavity area is possible by structural changes of the element. In case of the cavitation with the suction air, it is necessary to find the source of the air and seal it. The pressure gradient, the flow, the oxygen content in the tank, and hence the air dissolved in the water, the air flow rate, the noise intensity and the vibration velocity on the nozzle wall were measured on laboratory equipment. From the selected measurements the frequency spectrum of the variation of the water flow of the cavity with cavitation without air saturation and with air saturation was compared and evaluated.

Shallow Water and Channel Effects on Wave Resistance

1966 ◽  
Vol 10 (03) ◽  
pp. 164-181 ◽  
Author(s):  
Maria Kirsch
Keyword(s):  
Shallow Water ◽  
Cross Section ◽  
Rectangular Cross Section ◽  
Wave Resistance ◽  
Towing Tank ◽  
Channel Effects

Based on Sretenski's formula, the wave resistance in shallow water and in a channel of rectangular cross section is computed for certain mathematical ship forms. The results are plotted as curves and compared with the wave resistance in an unbounded liquid. The use of these curves for the determination of the wave resistance from towing-tank experiments is illustrated through an example.

scholarly journals Use Of Pulsed IR Thermography For Determination Of Size And Depth Of Subsurface Defect Taking Into Account The Shape Of Its Cross-Section Area

2015 ◽  
Vol 60 (2) ◽  
pp. 615-620 ◽  
Author(s):  
O. Wysocka-Fotek ◽  
M. Maj ◽  
W. Oliferuk
Keyword(s):  
Cross Section ◽  
Rectangular Cross Section ◽  
Time Derivative ◽  
Equivalent Diameter ◽  
Ir Thermography ◽  
Flat Bottom ◽  
Surface Distribution ◽  
Cross Section Area ◽  
Section Area

Abstract The paper is devoted to reconstruction of size and depth (distance from the tested surface) of artificial defects with square and rectangular cross-section areas using the pulsed IR thermography. Defects in form of flat-bottom holes were made in austenitic steel plate. The defect size was estimated on the basis of surface distribution of the time derivative of the temperature. In order to asses the depth of defects with considered geometries on the basis of calibration relations (i.e. dependence of time of contrast maximum vs. defect depth for given defect diameter) obtained for circular defects, the ‘equivalent diameter’ describing not only the defect cross-section area but also its shape was assigned. It has been shown that presented approach gives satisfactory results.

Comparison of Different Methods to Calculate Bed Shear Stress

1992 ◽  
Vol 25 (8) ◽  
pp. 131-140 ◽  
Author(s):  
M. R. Kabir ◽  
H. Torfs
Keyword(s):  
Shear Stress ◽  
Velocity Profile ◽  
Cross Section ◽  
Friction Velocity ◽  
Rectangular Cross Section ◽  
Reference Level ◽  
Bed Shear Stress ◽  
Rough Bed ◽  
Channel Slope

Precise velocity profile measurements were carried out in a fully developed, subcritical and supercritical flow on a smooth and a rough bed in a flume with a rectangular cross section. In both cases different approaches were used to calculate the friction velocity, u*, and comparisons were made. The influence of the reference level (hypothetical bed level) has been discussed. Friction velocities calculated from the velocity profile are very sensitive to the hypothetical bed level. For a smooth bed the determination of the reference level does not present any difficulties. However, for a rough bed this level shows dependency on the channel slope.

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