Hot-Wire Anemometry

Perry, A. E.; Libby, Paul A.

doi:10.1115/1.3167010

Cited by 92 publications

(139 citation statements)

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“…Following Perry [26], the fluctuation e of the bridge voltage caused by a hot-wire ran in Constant Temperature Anemometry (CTA) mode can be written in the following form…”

Section: Appendix A: Hot-wire Calibration Methodsmentioning

confidence: 99%

Experiments on the Flow Field and Acoustic Properties of a Mach number 0·75 Turbulent Air Jet at a Low Reynolds Number

Slot

Moore

Delfos

et al. 2009

Flow Turbulence Combust

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In this paper we present the experimental results of a detailed investigation of the flow and acoustic properties of a turbulent jet with Mach number 0·75 and Reynolds number 3·5 10 3 . We describe the methods and experimental procedures followed during the measurements, and subsequently present the flow field and acoustic field. The experiment presented here is designed to provide accurate and reliable data for validation of Direct Numerical Simulations of the same flow. Mean Mach number surveys provide detailed information on the centreline mean Mach number distribution, radial development of the mean Mach number and the evolution of the jet mixing layer thickness both downstream and in the early stages of jet development. Exit conditions are documented by measuring the mean Mach number profile immediately above the nozzle exit. The fluctuating flow field is characterised by means of a hot-wire, which produced radial profiles of axial turbulence at several stations along the jet axis and the development of flow fluctuations through the jet mixing layer. The axial growth rate of the jet instabilities are determined as function of Strouhal number, and the axial development of several spectral components is documented. The directivity of the overall sound pressure level and several spectral components were investigated. The spectral content of the acoustic far field is shown to be compatible with findings of hot-wire experiments in the mixing layer of the jet. In addition, the measured acoustic spectra agree with Tam's large-scale similarity and fine-scale similarity spectra (Tam et al., AIAA Pap 96, 1996).

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“…Following Perry [26], the fluctuation e of the bridge voltage caused by a hot-wire ran in Constant Temperature Anemometry (CTA) mode can be written in the following form…”

Section: Appendix A: Hot-wire Calibration Methodsmentioning

confidence: 99%

Experiments on the Flow Field and Acoustic Properties of a Mach number 0·75 Turbulent Air Jet at a Low Reynolds Number

Slot

Moore

Delfos

et al. 2009

Flow Turbulence Combust

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“…Despite comprehensive studies on the effects of fluid flow around hot wires (Brunn 1995, Collis and Williams 1959, Corrsin 1963, Fingerson and Freymuth 1983, Hinze 1975, Perry 1982, attention has focused on measurements at quite low Reynolds numbers, often at atmospheric pressure. In detailed studies using normal hot wires in fully-developed pipe flow at pressures up to 120 atm (Morrison et al 2002a(Morrison et al , 2002b, it has become apparent that some difficulties associated with hot-wire velocity measurement are particular to high Reynolds numbers.…”

Section: Introductionmentioning

confidence: 99%

“…Note that a 25-fold increase in Re w leads to an approximate 5-fold increase in Nu w because a typical forced convection law, for example that of Fand and Keswani (1972), is given by for 0.1 < Re w < 10 000, where Pr is the Prandtl number of the fluid which changes only slightly with pressure. Modelling a hot-wire system using a third-order transfer function (with a quadratic pole approximation-see Freymuth (1977), Perry (1982)), it can be shown that the effect of increasing the mean cooling velocity on the wire decreases the damping so that the system tends to become unstable. Owing to the form of the cooling law, equation (1.1), the same tendency occurs at high Reynolds numbers, even if the mean velocity is low.…”

Section: Introductionmentioning

confidence: 99%

The response of hot wires in high Reynolds-number turbulent pipe flow

Li¹,

McKeon²,

Jiang³

et al. 2004

Meas. Sci. Technol.

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Issues concerning the accuracy of hot-wire measurements in turbulent pipe flow are addressed for pipe Reynolds numbers up to 6 × 10 6 and hot-wire Reynolds numbers up to Re w ≈ 250. These include the optimization of spatial and temporal resolution and the associated feature of signal-to-noise ratio. Very high wire Reynolds numbers enable the use of wires with reduced length-to-diameter ratios compared to those typical of atmospheric conditions owing to increased wire Nusselt numbers. Simulation of the steady-state heat balance for the wire and the unetched portion of wire are used to assess static end-conduction effects: they are used to calculate wire Biot numbers, √ c 0 l, and fractional end-conduction losses, σ , which confirm the 'conduction-only' theory described by Corrsin. They show that, at Re w ≈ 250, the wire length-to-diameter ratio can be reduced to about 50, while keeping √ c 0 l > 3 and σ < 7% in common with accepted limits at Re w ≈ 3. It is shown that these limits depend additionally on the choice of wire material and the length of unetched wire. The dynamic effects of end-cooling are also assessed using the conduction-only theory.

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“…Este escoamento tem chamado a atenção de pesquisadores e engenheiros há mais de 100 anos, gerando uma grande quantidade de trabalhos publicados sobre este assunto ainda inesgotado (BEAR- MAN, 1969MAN, , 1980ROSHKO, 1993;BARKLEY;HENDERSON, 1996;WILLIAMSON, 1996;ZDRAVKOVICH, 1997ZDRAVKOVICH, , 2003. Vários estudos foram realizados sobre este escoamento, em geral utilizando esteiras de cilindros; porém, até o início da década de 90, grande parte do conhecimento acumulado era basicamente descritivo ou empírico (GERRARD, 1966;PERRY, 1982) e (MATHIS, 1987. Por exemplo, uma descrição de como se dá a formacão da esteira de vórtices atrás de um cilindro circular isolado foi proposta inicialmente por Gerrard (1966) e posteriormente complementada por Perry (1982).…”

Section: Esteirasunclassified

“…Vários estudos foram realizados sobre este escoamento, em geral utilizando esteiras de cilindros; porém, até o início da década de 90, grande parte do conhecimento acumulado era basicamente descritivo ou empírico (GERRARD, 1966;PERRY, 1982) e (MATHIS, 1987. Por exemplo, uma descrição de como se dá a formacão da esteira de vórtices atrás de um cilindro circular isolado foi proposta inicialmente por Gerrard (1966) e posteriormente complementada por Perry (1982). Gerrard (1966) sugeriu que o vórtice que está se formando puxa a camada cisalhante do lado oposto do cilindro através da esteira; eventualmente cortando o fornecimento de vorticidade do vórtice que está se desenvolvendo (WILLIAMSON, 1996).…”

Section: Esteirasunclassified

Análise da instabilidade hidrodinâmica de uma esteira assimétrica

Gennaro¹

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Hot-Wire Anemometry

Cited by 92 publications

References 0 publications

Experiments on the Flow Field and Acoustic Properties of a Mach number 0·75 Turbulent Air Jet at a Low Reynolds Number

Experiments on the Flow Field and Acoustic Properties of a Mach number 0·75 Turbulent Air Jet at a Low Reynolds Number

The response of hot wires in high Reynolds-number turbulent pipe flow

Análise da instabilidade hidrodinâmica de uma esteira assimétrica

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