Examination of the flow around a hot-wire probe using particle image velocimetry |
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Authors: | L J W Graham J Soria K Bremhorst |
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Institution: | (1) CSIRO Division of Building, Construction and Engineering, PO Box 56, 3190 Highett, Victoria, Australia;(2) Department of Mechanical Engineering, Monash University, 3168 Clayton, Victoria, Australia;(3) Department of Mechanical Engineering, The University of Queensland, 4072 Brisbane, Qld, Australia |
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Abstract: | Previous work has shown that the k
2 term in the effective cooling velocity equation for inclined hot-wires can become negative under certain probe configurations and wire length-to-diameter ratios. It was hypothesised that this was due to a downwash component of velocity along the wire when prong interference effects were expected to be minimal. Direct measurements of the flow around a typical hot-wire probe using digital particle image velocimetry have shown that this downwash velocity component does exist, leading to negative values of k
2 as calculated from the angle of deviation from the free stream.List of symbols
d
diameter of hot-wire mm
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k
factor in equation for effective dimensionless velocity for inclined hot-wire
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l
length of hot-wire mm
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Q
effective velocity mm/s
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U
free stream velocity mm/s
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angle between free stream and degrees wire normal
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angle through which flow is degrees deflected at working section of wire |
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Keywords: | |
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