Laser anemometry: a report on EUROMECH 36

Durst, F.; Melling, A.; Whitelaw, J. H.

doi:10.1017/s002211207200223x

Cited by 23 publications

(5 citation statements)

References 17 publications

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“…I n order to obtain velocity measurements of higher accuracy and wit'h less disturbance to the flow, the method of photographically timing the progress of dye markers, used in previous experiments, was discarded in favour of a laser-Doppler velocimeter system. These systems have been exteneively discussed in the literature; see, for example, Durst, Melling & Whitelaw (1972) for a general review. In our case the whole system was required t o rotate on the turntable above the working region and this dictated a unit which was compact, fairly light and relatively insensitive to vibration.…”

Section: The Experimental Measurementsmentioning

confidence: 99%

Source–sink flows in a rotating annulus: a combined laboratory and numerical study

Bennetts

Jackson

1974

J. Fluid Mech.

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A general characteristic of rapidly rotating fluids is that accurate experimental measurements can only be made of the main (azimuthal) flow. The secondary flow is then usually deduced from theory, although this is often incomplete in the boundary regions where the secondary flow is of most interest.In this paper we consider the case of source-sink flow between the porous walls of a rapidly rotating annular container and numerically integrate the full equations of motion in order to determine the complete structure of the secondary flow. The results are compared with the (approximate) analytic studies of Hide (1968) and Bennetts & Hocking (1973) to show the differences between the two approaches.A defect of many previous numerical papers has been the inability to check the solution in the nonlinear case. To overcome this, new experimental measurements of the azimuthal velocity profile for a Rossby number of 0·238 have been obtained and these are compared with the numerical results.

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Section: The Experimental Measurementsmentioning

confidence: 99%

Source–sink flows in a rotating annulus: a combined laboratory and numerical study

Bennetts

Jackson

1974

J. Fluid Mech.

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“…The large number of papers published in this field prohibits any attempt of a complete listing here. Some broad aspects of the method are presented in Rolfe et al (1968), Angus et al (1966), Davis (1968), Brayton and Goethert (1971), and Durst et al (1972), to cite a few.…”

Section: Laser-doppler Anemometrymentioning

confidence: 99%

Kinematics of Plane Stagnation Flow

Berker¹,

Lilleleht²

1977

Ind. Eng. Chem. Fund.

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An experimental program was carried out to compare the laminar, plane stagnation flow kinematics of a highpurity Newtonian mineral oil with a viscoelastic fluid of 5% by weight polyisobutylene solution in the same mineral oil solvent. Selected local axial velocity measurements were made over a 10-fold range of fluid flow rates by means of a Laser-Doppler Anemometer specially designed and constructed for this experiment. It is conservatively estimated that the accuracy of the point velocities measured with this method was better than ±5%.It was found that the normalized axial velocity vs. axial position curves superimposed for both fluids at very low flow rates over the entire flow field. However, upon increasing the flow rate, but still remaining in the laminar regime, the viscoelastic fluid velocity curves started to change appreciably, whereas the Newtonian fluid curves did not change at all. Formation of a "stagnant" zone was observed with the viscoelastic fluid near the stagnation point. This zone appeared to increase in thickness with increasing flow rates.

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“…d,, -M ' 2sine *The equations relevant to two-beam anemometers are already available in reference [6]. They are included here for completeness.…”

Section: Two-beam Anemometers*mentioning

confidence: 99%

“…This time interval is assumed the same as that between two zero crossings after band-pass filtering the signal. In reference [6] similar considerations were performed without taking into account any band-pass filtering and P > 0.5 mW/(m/s) was predicted. This is in agreement with the above considerations and corresponds to N,h = 1.…”

Section: U U Fmentioning

confidence: 99%

Light source and geometrical requirements for the optimization of optical anemometry signals

Durst

Whitelaw

1973

Opto-electronics

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The criteria for the design of optical arrangements for laser anemometry are formulated for reference-beam, two-beam and single-beam modes of operation. The dependence of useful light intensity upon optical path-length difference and number of axial laser modes is calculated. Laser power requirements are evaluated and the dependence upon band-pass filtering is quantitatively assessed. A new two-channel integrated-optical unit, with light-path compensation, and embodying the proposed design criteria, is described.

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Laser anemometry: a report on EUROMECH 36

Cited by 23 publications

References 17 publications

Source–sink flows in a rotating annulus: a combined laboratory and numerical study

Source–sink flows in a rotating annulus: a combined laboratory and numerical study

Kinematics of Plane Stagnation Flow

Light source and geometrical requirements for the optimization of optical anemometry signals

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