Experimental determination of the random lump-age distribution in the boundary layer of the turbulent pipe flow using laser-doppler anemometry

Maanen, H.R.E. van; Fortuin, J.M.H.

doi:10.1016/0009-2509(83)80158-4

Cited by 12 publications

(3 citation statements)

References 15 publications

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“…The slope criterion was chosen positive with respect to time, since the 'events' appeared to be marked by a sharp acceleration of the U' velocity. Van Maanen and Fortuin (1983) used a similar detection criterion in a turbulent pipe flow.…”

Section: Results Of the Use Of The Vita Detection Technique To Measurmentioning

confidence: 99%

The detection and measurement of turbulent structures in the atmospheric surface layer

Schols

1984

Boundary-Layer Meteorol

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Turbulence data from the planetary boundary layer (PBL) indicate the presence of deterministic turbulent structures. These structures often show up as asymmetric ramp patterns in measurements of the turbulent fluctuations of a scalar quantity in the atmospheric surface layer (ASL). The sign of the slope of the sharp upstream edge of such a triangular pattern depends on the thermal stability conditions of the ASL.The turbulent structures in the ASL have been tracked by a detection method which searches for rapid and strong fluctuations in a signal -the VITA (variable interval time averaging) technique. This detection method has previously been employed in laboratory boundary layers. The VITA detection method performs well in the ASL and reveals the presence of vertically coherent turbulent structures, which look similar to those in laboratory shear flows. At the moment that a sharp temperature interface appears, the horizontal alongwind velocity shows a sharp increase, along with a sudden decrease of vertical velocity, independent of the thermal stability conditions of the ASL. The fluctuating static pressure reveals a maximum at that moment. The vertical turbulent transports show a twin-peak character around the time that the sharp jumps in the temperature and the velocity signals appear.

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Section: Results Of the Use Of The Vita Detection Technique To Measurmentioning

confidence: 99%

The detection and measurement of turbulent structures in the atmospheric surface layer

Schols

1984

Boundary-Layer Meteorol

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“…Fortuin et al, 1992;Musschenga et al, 1992 . These histograms, derived from LDV signals, show that in turbulent water flows in straight, smooth tubes, the number N of de-Ž tected ages between t and t q ⌬ t can be represented by Van . Maanen and Fortuin, 1983 Nr⌬ t s N rt exp y trt , 2 1 Ž .…”

Section: Detection Parameters a And Kmentioning

confidence: 96%

“…With laser-Doppler ve-Ž . locimetry LDV , it has subsequently been shown that for turbulent Newtonian fluid flows in a pipe, the age distribution of fluid elements at the wall is random and that the mean age is dependent on the tube diameter, and the velocity and Ž viscosity of the fluid Van Maanen and Fortuin, 1983;Muss-. chenga et al, 1992 .…”

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confidence: 99%