The surface hot wire as a means of measuring mean and fluctuating wall shear stress

Sturzebecher, D.; Anders, S.; Nitsche, W.

doi:10.1007/s003480100284

Cited by 65 publications

(17 citation statements)

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“…The local shear stress reaches a local minimum at the separationpoint, and a sudden jump in the fluctuation occurs due to stronger vertical mixing of flow after flow separates [6]. The reason why the local shear stress minimum occurs at the separation point is that reverse flow after separation enhances local heat transfer (in thermal principle).…”

Section: The Universal Statistic Methods For Decision Separation Pointmentioning

confidence: 94%

The fabrication and integration of a novel shear stress sensor array and its wind tunnel test

Liu

Yuan

et al. 2008

J. Micro-Nano Mech.

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A new generation of micro shear stress sensors and flexible PCB for the general purpose of flow separation detection and control is presented here. A novel MEMS shear stress sensor array featuring integration of discrete micro sensors and polyimide substrate has been developed. Then, CFD (Computational Fluid Dynamics) simulations were performed to estimate the corresponding shear stress distribution within the column cylinder aerofoil at flow conditions are the velocity of 17.3 m/s, which is according to the Re of 1×10 5 . In the wind tunnel tests, by disposing the two sensor arrays output signals of the sensors output voltages means and RMS values, the results proved by these flexible arrays could detect the location of the fluid separation point in time.

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Section: The Universal Statistic Methods For Decision Separation Pointmentioning

confidence: 94%

The fabrication and integration of a novel shear stress sensor array and its wind tunnel test

Liu

Yuan

et al. 2008

J. Micro-Nano Mech.

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“…Ref. [1] utilizes flush-mounted hot-wire anemometers to directly measure the skin-friction velocity in laminar-turbulent transition flow (low Reynolds numbers). The wire was capable of measuring the fluctuations in the skin-friction with high quality signal but presents a higher application effort.…”

Section: A Direct Methodsmentioning

confidence: 99%

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2020

IJET

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In the context of measurements in the boundary layer, the problem of estimating the skinfriction velocity is relevant because this velocity is proportional to the drag force and therefore is related to the energy wasted by friction in vehicles such as planes, cars, ships, etc. The existing literature is scarce when presenting an overview of the methods appropriate for the estimation in the scenario: (a) flat plate flow, (b) air incompressible regime, (c) outdoor conditions, (d) turbulent flow. As a response to such shortcomings, this manuscript presents an overview of the methods: (1) hot-wire anemometry, (2) hotfilm anemometry and (3) particle image velocimetry (PIV), in the aforementioned scenario. This manuscript reviews the diverse components that these methods require and contrasts the skin-friction velocity measurements stemming from them. Our results show a consistent estimation of the skin-friction velocity with the three methods. Future work is required in assessing the influence of wall proximity on hot-wire measurements and the influence of different Reynolds regimes on the skin-friction velocity estimations. Future work is required in the aspects of comparing the direct measurement of the skinfriction velocity with the hot-wire probe very close to the wall and the assessment of the accuracy of the techniques at different Reynolds numbers. Keyword-Skin-friction, Boundary Layer, Hot-wire, Hot-fil, Turbulent Flow GLOSSARY Free-stream velocity m/s Boundary layer thickness m Kinematic viscosity m 2 /s ℓ Viscous length scale non-dimensional + Viscous scaled parameters non-dimensional Friction velocity m/s Friction coefficient non-dimensional ISSN (Print) : 2319-8613 ISSN (Online) : 0975-4024 Cristian Rendon-Cardona et al.

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“…An electric current is passed (via aluminum metallization) through the resistor which functions as a hot wire. A flexible shear stress arrays is required because the flow separation point along the leading edge is a function of changing flow velocity and angle of attack of in real flow field [4]. Therefore, a one-dimensional flexible Si-diode shear stress sensor array, which could detect 2D flow separation point, was fabricated on a flexible substrate [5].…”

Section: Flexible Sensor Arraymentioning

confidence: 99%

Detecting boundary-layer separation point with a micro shear stress sensor array

Liu

Yuan

Deng

et al. 2007

Sensors and Actuators A: Physical

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The surface hot wire as a means of measuring mean and fluctuating wall shear stress

Cited by 65 publications

References 0 publications

The fabrication and integration of a novel shear stress sensor array and its wind tunnel test

The fabrication and integration of a novel shear stress sensor array and its wind tunnel test

Untitled

Detecting boundary-layer separation point with a micro shear stress sensor array

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