Velocity measurements in the turbulent pipe flow of a dilute polymer solution

Halliwell, Neil A.; Lewkowicz, A K

doi:10.1088/0022-3735/6/12/028

Cited by 2 publications

(1 citation statement)

References 5 publications

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“…A U-tube manometer is used to determine the static pressure. Velocity heads are measured in the main pipe and the branch pipes using a traverse with a Pitot needle (Halliwell andLewkowicz 1973, Cheong 2001), fabricated indigenously at IISc with an accuracy of 0.0003048 m (0.004 feet). A measurement site, where the stream is flowing in a known direction, is selected and the cross-section divided into a number of equal areas.…”

Section: Methodsmentioning

confidence: 99%

Energy losses at pipe trifurcations

Rao

Kumar

2009

Urban Water Journal

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In the case of pipe trifurcation, previous observations report negative energy losses in the centre branch. This causes an anomaly, because there should not be any negative energy loss due to conservation of energy principle. Earlier investigators have suggested that this may be due to the non-inclusion of kinetic energy coefficient (a) in the computations of energy losses without any experimental evidence. In the present work, through experimentally determined velocity profiles, energy loss coefficients have been evaluated. It has been found that with the inclusion of a in the computations of energy loss, there is no negative energy loss in the centre branch.

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Section: Methodsmentioning

confidence: 99%

Energy losses at pipe trifurcations

Rao

Kumar

2009

Urban Water Journal

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Investigation into the anomalous behavior of Pitot tubes in dilute polymer solutions

Halliwell

Lewkowicz

1975

The Physics of Fluids

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The anomalous behavior of Pitot tubes in the turbluent pipe flow of a dilute polymer solution is investigated and discussed. Pitot tube error is measured using an alternative optical means of local velocity measurement. Unlike previous research in this field a strict control is kept on the state of degradation of the solutions and Pitot tube error is measured directly whilst the tube is under test. Errors which occurred in total head pressure measurement were found to be negative and in some cases were as high as 40%. Factors which influence the Pitot tube accuracy are identified and a dynamical similarity argument is used to express the error as a function of these. Pitot tube error is attributed to the polymer solutions storing energy viscoelastically at the tube tip. A critical review of explanations previously put forward for Pitot error with reference to the results is included in the discussion. The polymer used was polyox WSR-301.

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Velocity measurements in the turbulent pipe flow of a dilute polymer solution

Cited by 2 publications

References 5 publications

Energy losses at pipe trifurcations

Energy losses at pipe trifurcations

Investigation into the anomalous behavior of Pitot tubes in dilute polymer solutions

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