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Turbulence measurements using a nanoscale thermal anemometry probe

Published online by Cambridge University Press:  01 September 2010

SEAN C. C. BAILEY ,
GARY J. KUNKEL ,
MARCUS HULTMARK ,
MARGIT VALLIKIVI ,
JEFFREY P. HILL ,
KARL A. MEYER ,
CANDICE TSAY ,
CRAIG B. ARNOLD  and
ALEXANDER J. SMITS
SEAN C. C. BAILEY*
Affiliation:
Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, NJ 08544, USA
GARY J. KUNKEL
Affiliation:
Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, NJ 08544, USA
MARCUS HULTMARK
Affiliation:
Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, NJ 08544, USA
MARGIT VALLIKIVI
Affiliation:
Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, NJ 08544, USA
JEFFREY P. HILL
Affiliation:
Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, NJ 08544, USA
KARL A. MEYER
Affiliation:
Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, NJ 08544, USA
CANDICE TSAY
Affiliation:
Department of Electrical Engineering, Princeton University, Princeton, NJ 08544, USA
CRAIG B. ARNOLD
Affiliation:
Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, NJ 08544, USA
ALEXANDER J. SMITS
Affiliation:
Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, NJ 08544, USA
*
†Present address: Department of Mechanical Engineering, University of Kentucky, Lexington, KY 40515, USA. Email address for correspondence: [email protected]
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Abstract

A nanoscale thermal anemometry probe (NSTAP) has been developed to measure velocity fluctuations at ultra-small scales. The sensing element is a free-standing platinum nanoscale wire, 100 nm × 2 μm × 60 μm, suspended between two current-carrying contacts and the sensor is an order of magnitude smaller than presently available commercial hot wires. The probe is constructed using standard semiconductor and MEMS manufacturing methods, which enables many probes to be manufactured simultaneously. Measurements were performed in grid-generated turbulence and compared to conventional hot-wire probes with a range of sensor lengths. The results demonstrate that the NSTAP behaves similarly to conventional hot-wire probes but with better spatial resolution and faster temporal response. The results are used to investigate spatial filtering effects, including the impact of spatial filtering on the probability density of velocity and velocity increment statistics.

JFM classification

Micro-/Nano-fluid dynamics: MEMS/NEMS Turbulent Flows: Turbulent Flows
Type
Papers
Information
Journal of Fluid Mechanics , Volume 663 , 25 November 2010 , pp. 160 - 179
Copyright
Copyright © Cambridge University Press 2010

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Footnotes

‡

Present address: Seagate Technology, Bloomington, MN 55435, USA

Present address: Aero/Fluids/Performance Group, Lockheed Martin Space Systems, Sunnyvale, CA 94086, USA

∥

Present address: MITRE Corporation, McLean, VA 22102, USA

References

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