The Effect of Blade Manipulator in Fully Developed Pipe Flow

1992 ◽  
Vol 114 (4) ◽  
pp. 687-689 ◽  
Author(s):  
Y. A. Mah ◽  
B. C. Khoo ◽  
Y. T. Chew
Keyword(s):  
Boundary Layer ◽  
Pipe Flow ◽  
Pipe Wall ◽  
Stress Measurement ◽  
Volumetric Flow Rate ◽  
Rate Measurement ◽  
Flow Rate Measurement ◽  
Equivalent Boundary ◽  
Layer Flow ◽  
Wall Shear Stress Measurement

Experiments were carried out in applying the concept of passive device called BLADEs (boundary-layer alteration devices) to fully developed pipe flow to assess its feasibility as a drag reduction device. The results of both the volumetric flow rate measurement and the pipe wall pressure distribution taken far downstream show that there is a net increase in drag with the device. With BLADES in tandem arrangement, there is a further net increase in drag which is contrary to its counterpart in boundary layer flow. Although the wall shear stress measurement following the device indicates some reduction in local drag, its magnitude of reduction is much smaller than that seen in the equivalent boundary flow. All these results suggest little possibility of any useful application of BLADEs to pipe flow.

Flow rate measurement in a pipe flow by vortex shedding

2010 ◽  
Vol 74 (2) ◽  
pp. 77-86 ◽  
Author(s):  
M. Reik ◽  
R. Höcker ◽  
C. Bruzzese ◽  
M. Hollmach ◽  
O. Koudal ◽  
...  
Keyword(s):  
Flow Rate ◽  
Vortex Shedding ◽  
Pipe Flow ◽  
Rate Measurement ◽  
Flow Rate Measurement

C212 A Study of Pipe Flow Rate Measurement Using Air-coupled Ultrasound

2013 ◽  
Vol 2013.18 (0) ◽  
pp. 307-310
Author(s):  
Keisuke TSUKADA ◽  
Nobuyoshi TSUZUKI ◽  
Hiroshige KIKURA
Keyword(s):  
Flow Rate ◽  
Pipe Flow ◽  
Rate Measurement ◽  
Flow Rate Measurement

Rough wall turbulent boundary layers

1969 ◽  
Vol 37 (2) ◽  
pp. 383-413 ◽  
Author(s):  
A. E. Perry ◽  
W. H. Schofield ◽  
P. N. Joubert
Keyword(s):  
Boundary Layer ◽  
Reynolds Number ◽  
Pressure Gradient ◽  
Pipe Flow ◽  
Boundary Layer Flow ◽  
Shear Velocity ◽  
Rough Wall ◽  
Pipe Diameter ◽  
Boundary Layer Development ◽  
Layer Flow

This paper describes a detailed experimental study of turbulent boundary-layer development over rough walls in both zero and adverse pressure gradients. In contrast to previous work on this problem the skin friction was determined by pressure tapping the roughness elements and measuring their form drag.Two wall roughness geometries were chosen each giving a different law of behaviour; they were selected on the basis of their reported behaviour in pipe flow experiments. One type gives a Clauser type roughness function which depends on a Reynolds number based on the shear velocity and on a length associated with the size of the roughness. The other type of roughness (typified by a smooth wall containing a pattern of narrow cavities) has been tested in pipes and it is shown here that these pipe results indicate that the corresponding roughness function does not depend on roughness scale but depends instead on the pipe diameter. In boundary-layer flow the first type of roughness gives a roughness function identical to pipe flow as given by Clauser and verified by Hama and Perry & Joubert. The emphasis of this work is on the second type of roughness in boundary-layer flow. No external length scale associated with the boundary layer that is analogous to pipe diameter has been found, except perhaps for the zero pressure gradient case. However, it has been found that results for both types of roughness correlate with a Reynolds number based on the wall shear velocity and on the distance below the crests of the elements from where the logarithmic distribution of velocity is measured. One important implication of this is that a zero pressure gradient boundary layer with a cavity type rough wall conforms to Rotta's condition of precise self preserving flow. Some other implications of this are also discussed.

Ultrasonic Imaging and Velocimetry in Two-Phase Pipe Flow

1993 ◽  
Vol 115 (2) ◽  
pp. 108-116 ◽  
Author(s):  
S. L. Morriss ◽  
A. D. Hill
Keyword(s):  
Pipe Flow ◽  
Petroleum Industry ◽  
Doppler Velocity ◽  
Measurement Technology ◽  
Pulsed Doppler ◽  
Rate Measurement ◽  
Flow Rate Measurement ◽  
Two Phase ◽  
Ultrasonic Measurements ◽  
First Results

This paper presents the first results of an experimental and theoretical investigation of the feasibility of using ultrasonic measurements in multiphase pipe flow. Extant downhole flow rate measurement technology used in the petroleum industry is not adequate in some multiphase flow regimes, particularly when the well is deviated from vertical. Ultrasonics offers Doppler velocity and imaging capabilities, both of which could be of great value in production logging. Some air-water measurements, both imaging and velocimetry, are presented, along with a discussion of pulsed Doppler theory.

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