Response behaviour of hot wires in shear flow

Gessner, F. B.; Möller, Georg

doi:10.1017/s0022112071001162

Cited by 22 publications

(11 citation statements)

References 6 publications

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“…Errors could also arise when measuring with crossed wires in shear layers due to the finite sensor volume. Gessner & Moller (1971) proposed a shear parameter S = ( U /U cl )(d/ l), where U is the velocity change along the length of the wire, and U cl is the velocity at the centre of the wire. In the current experiments S < 2.90 × 10 −4 , and since this is considerably less than the critical value of 10 −3 suggested by Lomas (1986), errors due to mean shear effects were negligible.…”

Section: Angle Calibrationmentioning

confidence: 99%

The intermediate wake of a body of revolution at high Reynolds numbers

2010

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Results are presented on the flow field downstream of a body of revolution for Reynolds numbers based on a model length ranging from 1.1 × 106 to 67 × 106. The maximum Reynolds number is more than an order of magnitude larger than that obtained in previous laboratory wake studies. Measurements are taken in the intermediate wake at locations 3, 6, 9, 12 and 15 diameters downstream from the stern in the midline plane. The model is based on an idealized submarine shape (DARPA SUBOFF), and it is mounted in a wind tunnel on a support shaped like a semi-infinite sail. The mean velocity distributions on the side opposite the support demonstrate self-similarity at all locations and Reynolds numbers, whereas the mean velocity distribution on the side of the support displays significant effects of the support wake. None of the Reynolds stress distributions of the flow attain self-similarity, and for all except the lowest Reynolds number, the support introduces a significant asymmetry into the wake which results in a decrease in the radial and streamwise turbulence intensities on the support side. The distributions continue to evolve with downstream position and Reynolds number, although a slow approach to the expected asymptotic behaviour is observed with increasing distance downstream.

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Section: Angle Calibrationmentioning

confidence: 99%

The intermediate wake of a body of revolution at high Reynolds numbers

2010

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“…The three-wire heat flux probe consisted of two 2.5 µm platinum-coated tungsten hot wires separated by 0.35 mm in a cross-wire formation with a 2.5 µm cold wire placed 0.55 mm upstream of the geometric centre of the cross-wire and perpendicular to the plane of measurement of the cross-wire. The size parameters were chosen following design criteria given in the literature (Wyngaard 1968;Guitton & Patel 1969;Gessner & Moller 1971;Strohl & Comte-Bellot 1973;Nakayama & Westphal 1986;Blair & Bennett 1987;Ligrani & Bradshaw 1987a, b) and following a similar design to that used by Littell & Eaton for their cross-wires. This was done to achieve the best resolution while still measuring temperature and velocity without interference effects.…”

Section: Facility and Experimental Techniquesmentioning

confidence: 99%

Turbulent heat and momentum transport on a rotating disk

Elkins

Eaton

2000

J. Fluid Mech.

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Measurements in the turbulent momentum and thermal boundary layers on a rotating disk with a uniform heat flux surface are described for Reynolds numbers up to 106. Measurements include mean velocities and temperatures, all six Reynolds stresses, turbulent temperature fluctuations, and three turbulent heat fluxes. The mean velocity profiles have no wake region, but the mean temperature profiles do. The turbulent temperature fluctuations have a large peak in the outer layer, and there is a third turbulent heat flux in the cross-flow direction. Correlation coefficients and structure parameters are not constant across the boundary layer as they are in two-dimensional boundary layers (2DBLs), and their values are lower. The turbulent Prandtl number agrees with 2DBL values in the lower part of the outer region but is reduced from the 2DBL values higher in the boundary layer. In the outer region of the boundary layer, the transport processes differ significantly from what is observed in two-dimensional turbulent boundary layers: ejections dominate the transport of momentum while both ejections and sweeps contribute to the transport of the passive scalar.

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“…The smallest wall distance in these measurements was y = 1.5mm, though the results were expected to be impaired by mean-velocity gradients in the vicinity of the wall (see e.g. Gessner & Moller 1971;Sandborn 1976).…”

Section: Experimental Setup and Measurement Techniquementioning

confidence: 90%

Measurement of the Reynolds stresses and the mean-flow field in a three-dimensional pressure-driven boundary layer

Müller¹

1982

J. Fluid Mech.

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An experimental study of a steady, incompressible, three-dimensional turbulent boundary layer approaching separation is reported. The flow field external to the boundary layer was deflected laterally by turning vanes so that streamwise flow deceleration occurred simultaneous with cross-flow acceleration. At 21 stations profiles of the mean-velocity components and of the six Reynolds stresses were measured with single- and X-hot-wire probes, which were rotatable around their longitudinal axes. The calibration of the hot wires with respect to magnitude and direction of the velocity vector as well as the method of evaluating the Reynolds stresses from the measured data are described in a separate paper (Müller 1982, hereinafter referred to as II). At each measuring station the wall shear stress was inferred from a Preston-tube measurement as well as from a Clauser chart. With the measured profiles of the mean velocities and of the Reynolds stresses several assumptions used for turbulence modelling were checked for their validity in this flow. For example, eddy viscosities for both tangential directions and the corresponding mixing lengths as well as the ratio of resultant turbulent shear stress to turbulent kinetic energy were derived from the data.

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Response behaviour of hot wires in shear flow

Cited by 22 publications

References 6 publications

The intermediate wake of a body of revolution at high Reynolds numbers

The intermediate wake of a body of revolution at high Reynolds numbers

Turbulent heat and momentum transport on a rotating disk

Measurement of the Reynolds stresses and the mean-flow field in a three-dimensional pressure-driven boundary layer

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