Hot wire anemometry for the measurement of temperature and velocity fluctuations inside a thermoacoustic cooler

2006 ◽  
Vol 119 (5) ◽  
pp. 3415-3415 ◽  
Author(s):  
Arganthaël Berson ◽  
Philippe Blanc‐Benon ◽  
Luc Mongeau ◽  
Insu Paek
Keyword(s):  
Hot Wire ◽  
Velocity Fluctuations ◽  
Hot Wire Anemometry ◽  
Thermoacoustic Cooler

Response Compensation Scheme for Constant-Current Hot-Wire Anemometry Based on Frequency Response Analysis

2011 ◽  
Author(s):  
Kazuhide Kaifuku ◽  
Soe Minn Khine ◽  
Tomoya Houra ◽  
Masato Tagawa
Keyword(s):  
Turbulent Flows ◽  
Constant Temperature ◽  
Response Speed ◽  
Wake Flow ◽  
Constant Current ◽  
Response Analysis ◽  
Compensation Scheme ◽  
Hot Wire ◽  
Velocity Fluctuations ◽  
Hot Wire Anemometry

Hot-wire anemometry (HWA) is used for measuring velocity fluctuations such as turbulent flows. It is generally operated in three modes; constant-temperature (CT), constant-current (CC) and constant-voltage (CV) types. The constant-temperature anemometer (CTA) is the mainstream anemometer, while others are rarely used in measuring normal turbulent flows because of their insufficient response speed. However, since the constant-current anemometer (CCA) can be composed of simple circuits, the HWA can be realized at quite a low cost. In this study, the response characteristics of the CCA are theoretically analyzed, and a compensation scheme is proposed. The scheme is experimentally tested in a turbulent wake flow formed behind a cylinder. As a result, it has been confirmed that the root-mean-square (rms) velocities and the power-spectrum distributions compensated by the present scheme agree well with those measured with CTA. Hence, the CCA provides reliable measurement of turbulent velocity fluctuations.

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.

Analysis of hot-wire anemometry data obtained in a synthetic jet flow

2004 ◽  
Vol 28 (4) ◽  
pp. 265-272 ◽  
Author(s):  
S.G. Mallinson ◽  
J.A. Reizes ◽  
G. Hong ◽  
P.S. Westbury
Keyword(s):  
Jet Flow ◽  
Synthetic Jet ◽  
Hot Wire ◽  
Hot Wire Anemometry
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