Hot-Wire Anemometry for Velocity Measurements in Nanopowder Flows

2009 ◽  
Vol 131 (3) ◽  
Author(s):  
Sergey P. Bardakhanov ◽  
Sang W. Joo
Keyword(s):  
Vertical Channel ◽  
Field Measurements ◽  
Hot Wire ◽  
Velocity Measurements ◽  
Flow Measurements ◽  
Chute Flow ◽  
Test Platform ◽  
Hot Wire Anemometry ◽  
Gaseous Flows ◽  
A New Technique

A new technique for velocity-field measurements in fine granular systems is introduced. The hot-wire anemometry, mainly used for gaseous flows, is applied to nanopowders and is found to be a viable experimental method for flow measurements. A generic chute flow of aluminum oxide C and Aerosil A-90 and A-380 powders through a vertical channel is chosen as a test platform, and the results suggest that the hot-wire anemometry is a favorable option for nanopowder measurements.

Hot-wire and hot-film anemometry and conditional measurements: A report on Euromech 132

1981 ◽  
Vol 110 ◽  
pp. 115-128 ◽  
Author(s):  
G. Comte-Bellot ◽  
G. Charnay ◽  
J. Sabot
Keyword(s):  
Fluid Flow ◽  
Hot Wire ◽  
Velocity Measurements ◽  
Complex Flows ◽  
Pattern Recognition Analysis ◽  
Hot Wires ◽  
A New Technique ◽  
Hot Film ◽  
Sampling Pattern ◽  
Hot Film Anemometry

The European Mechanics Colloquium, Euromech 132, was held at the Ecole Centrale de Lyon from 2 to 4 July 1980. Specific areas of hot-wire or hot-film anemometry were presented and discussed, more especially the effect of the finite time constant of the wire supports, the use of yawed hot wires in supersonic flows, the possible improvement of vorticity meters, and multi-point measurements of wall-shear-stress fluctuations. Other subjects described during the meeting included a new technique for concentration measurements in flames, developments and new uses of digitization and conditional sampling, pattern recognition analysis of fluid flow from multi-point, multi-time velocity measurements, and new turbulence measurements in complex flows and in fluid-flow machinery.An exhibition of hot-wire and hot-film anemometers and associated equipment was held during the colloquium.

Detailed Flow Measurements in a Centrifugal Compressor Vaneless Diffuser

1994 ◽  
Vol 116 (3) ◽  
pp. 453-460 ◽  
Author(s):  
A. Pinarbasi ◽  
M. W. Johnson
Keyword(s):  
Centrifugal Compressor ◽  
Turbulent Mixing ◽  
Phase Lock Loop ◽  
Wake Flow ◽  
Hot Wire ◽  
Velocity Measurements ◽  
Vaneless Diffuser ◽  
Flow Measurements ◽  
Loop Technique ◽  
Made In

Hot-wire anemometer measurements have been made in the vaneless diffuser of a 1-m-dia low-speed backswept centrifugal compressor using a phase lock loop technique. Radial, tangential, and axial velocity measurements have been made on eight measurement planes through the diffuser. The flow field at the diffuser entry clearly shows the impeller jet-wake flow pattern and the blade wakes. The passage wake is located on the shroud side of the diffuser and mixes out slowly as the flow moves through the diffuser. The blade wakes, on the other hand, distort and mix out rapidly in the diffuser. Contours of turbulent kinetic energy are also presented on each of the measurement stations, from which the regions of turbulent mixing can be deduced.

Detailed Flow Measurements in a Centrifugal Compressor Vaneless Diffuser

1993 ◽  
Author(s):  
Ali Pinarbasi ◽  
Mark W. Johnson
Keyword(s):  
Centrifugal Compressor ◽  
Turbulent Mixing ◽  
Phase Lock Loop ◽  
Wake Flow ◽  
Hot Wire ◽  
Velocity Measurements ◽  
Vaneless Diffuser ◽  
Flow Measurements ◽  
Loop Technique ◽  
Made In

Hot wire anemometer measurements have been made in the vaneless diffuser of a 1 metre diameter low speed backswept centrifugal compressor using a phase lock loop technique. Radial, tangential and axial velocity measurements have been made on eight measurement planes through the diffuser. The flow field at the diffuser entry clearly shows the impeller jet-wake flow pattern and the blade wakes. The passage wake is located on the shroud side of the diffuser and mixes out slowly as the flow moves through the diffuser. The blade wakes, on the other hand, distort and mix out rapidly in the diffuser. Contours of turbulent kinetic energy are also presented on each of the measurement stations, from which the regions of turbulent mixing can be deduced.

Using single-sensor hot-wire anemometry for velocity measurements in confined swirling flows

Measurement ◽  
2018 ◽  
Vol 129 ◽  
pp. 277-280 ◽  
Author(s):  
I.H. Rusli ◽  
S. Aleksandrova ◽  
H. Medina ◽  
S.F. Benjamin
Keyword(s):  
Swirling Flows ◽  
Hot Wire ◽  
Velocity Measurements ◽  
Hot Wire Anemometry ◽  
Single Sensor

Hot-wire Anemometry in Low-Density Flows

AIAA Journal ◽  
1971 ◽  
Vol 9 (10) ◽  
pp. 2019-2027 ◽  
Author(s):  
E. M. SCHMIDT ◽  
R. J. CRESCI
Keyword(s):  
Low Density ◽  
Hot Wire ◽  
Hot Wire Anemometry

Flow-Induced Vibration in a Single Row of Cylinders With p/D = 1.26

2021 ◽  
Author(s):  
Roberta F. Neumeister ◽  
Adriane P. Petry ◽  
Sergio V. Möller
Keyword(s):  
Hot Wire ◽  
Flow Induced Vibration ◽  
Single Row ◽  
Reference Flow ◽  
Wake Interaction ◽  
Hot Wire Anemometry ◽  
Tube Banks ◽  
Comparison Of The Results ◽  
The Impact ◽  
Space Ratio

Abstract Crossflow over a row of cylinders with a close space ratio presents an asymmetric configuration with large and narrow wakes behind the cylinders. The wake interaction can impact the vibration response of the cylinders. In tube banks, the impact results in damages to the equipment. The present experimental study aims to analyze the influence of close space observed in a single row of cylinders on the flow-induced vibration. The study compares a single row with fixed cylinders and a single row with one cylinder free to vibrate. The cylinder free to vibrate is tested in four configurations. The study was conducted with an aerodynamic channel with a cross-section of 0.193 × 0.146 m and smooth cylinders with a diameter of 25.1 mm, space ratio is 1.26. The measurements are executed with hot-wire anemometry and accelerometers, for the cases with one cylinder free to vibrate and with hot-wire anemometry and microphones for the case with all fixed cylinders. The Reynolds number ranges between 1.0 × 104 and 4.5 × 104, obtained with the reference flow velocity, measured with a Pitot tube, and the cylinder diameter. The comparison between the wake response for single row fixed and single row and free to vibrate are executed using Fourier transform and Wavelet Transform. The comparison of the results with the models presented in the literature to predict the elastic instability of the fluid in a single row of cylinders is performed.

Combined Simultaneous Flow Visualization/Hot-Wire Anemometry for the Study of Turbulent Flows

1980 ◽  
Vol 102 (2) ◽  
pp. 174-182 ◽  
Author(s):  
R. E. Falco
Keyword(s):  
Pressure Gradient ◽  
Flow Visualization ◽  
Turbulent Flows ◽  
Unsteady Flows ◽  
Gradient Flows ◽  
Hot Wire ◽  
Visual Patterns ◽  
Favorable Pressure Gradient ◽  
Hot Wire Anemometry ◽  
Scattering Light

The measurement of coherent motions in turbulent and unsteady flows is discussed. A technique which discriminates these motions based upon the patterns they create by scattering light from a fog of tiny oil drops is described. It is shown that hot-wire anemometry can be used in this oil fog so that hot-wire data can be conditionally sampled to the visual patterns, giving directly interpretable measures of the importance of the selected features. The three-dimensionality of the coherent motions can also be directly accounted for, using mutually orthogonal sheets of light. Results of step flows, and zero and favorable pressure gradient flows are described.

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