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Title of Journal: Exp Fluids

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Abbravation: Experiments in Fluids

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Springer-Verlag

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10.1007/bf00043103

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1432-1114

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Turbulence measurements in pipe flow using a nano

Authors: M Vallikivi M Hultmark S C C Bailey A J Smits
Publish Date: 2011/07/21
Volume: 51, Issue: 6, Pages: 1521-1527
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Abstract

A new nanoscale thermal anemometry probe NSTAP has been developed using a novel procedure based on deep reactive ion etching The performance of the new probe is shown to be superior to that of the previous design by Bailey J Fluid Mech 663160–179 2010 It is then used to measure the streamwise velocity component of fully developed turbulent pipe flow and the results are compared with data obtained using conventional hotwire probes The NSTAP agrees well with the hotwire at low Reynolds numbers but it is shown that it has better spatial resolution and frequency response The data demonstrate that significant spatial filtering effects can be seen in the hotwire data for probes as small as 7 viscous units in lengthThe support provided by ONR through Grant N00014910138 Program Manager Dr Ron Joslin is gratefully acknowledged Authors would also like to acknowledge George Patrick Watson of the PRISM Micro/Nano Fabrication Laboratory at Princeton University for his invaluable advice and assistance in developing the NSTAP fabrication process and Jim Sturm the Director of PRISM for making the microfabrication facilities available

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