Hot-Wire Calibration at Low Velocities: Revisiting the Vortex Shedding Method

Sattarzadeh, Sohrab S.; Kalpakli, Athanasia

doi:10.1155/2013/241726

Cited by 5 publications

(3 citation statements)

References 36 publications

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“…Among calibration methods that do not require stationary air flow, there is a method that uses vortices shed from a cylinder [ 2 , 3 , 4 ]. The tested device is placed behind the cylinder, and the relationship between the Strouhal and Reynolds numbers is used to determine the flow velocity.…”

Section: Introductionmentioning

confidence: 99%

Experimental Stand for Very-Low-Velocity Gas Flow Generation

Piga

Wodziak

Sobczyk

et al. 2023

Sensors

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This article presents an experimental stand for the generation of gas flows with very low velocities. The constant volume air flow was generated in the measurement area with the use of a Mariotte bottle and a water piston (water column in a tank). The air-flow velocity was determined from the change in the height of the water piston with time, which was measured via the difference between the pressure above the water surface and the pressure at the bottom of the water column. The tests were carried out in the mean velocity range of 0.35–66 cm/s. The five different velocities of air flowing out of the measurement pipe, measured with the particle image velocimetry method were compared with the results from the water piston method. The differences did not exceed 7%.

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Section: Introductionmentioning

confidence: 99%

Experimental Stand for Very-Low-Velocity Gas Flow Generation

Piga

Wodziak

Sobczyk

et al. 2023

Sensors

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show abstract

“…The other technique required no additional instrument and was based on the dependence of vortex shedding frequency behind cylinders on the ow velocity. Di erent aspects of this technique may be found in investigations of Ardekani [10], Sattarzadeh et al [11], and Lee and Budwig [12]. A fully-developed laminar ow in a pipe was also used for calibration, as suggested by Lee and Budwig [12] and Yue and Malmstr om [13].…”

Section: Introductionmentioning

confidence: 99%

Hot-film/hot-wire anemometer calibration for low velocities using image processing

2019

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Calibration of hot-wire and hot-lm probes at low velocities is a di cult task because the dynamic pressure at these velocities is quite low and may not be easily measured. To solve this problem, substituent techniques have been presented in the literature that rely on other phenomena and utilize di erent hardware. This study described a simple and low-cost method which proposes moving the anemometer probe in the quiescent air (here by means of a swinging arm) and tracked this motion with a camera. After processing the images, the time history of the probe velocity was measured by numerical calculations. Calibration curve was, then, obtained without any predetermined relationship. Using a medium-speed video camera, which is often found in laboratories, would obviate the need for a position sensor and a complicated arm on which this sensor is mounted. This technique can be used for not only pendulums but also other means of moving probes in a quiescent medium.

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“…Among various flow sensors, thermal flow sensors have been investigated most extensively due to their higher sensitivity, ease of fabrication, and lack of moving parts compared with nonthermal flow sensing methods [2]. Although optical techniques such as laser Doppler velocimetry (LDV) and particle image velocimetry (PIV) have superseded thermal flow sensors in many areas, there is a renewed interest in the thermal lowspeed probes, due to the advances of its small size and good frequency response as well as applicability to a wide velocity range with high accuracy and resolution, which makes it especially suitable for rapidly changing gas flow velocities such as transient and turbulent flows [3,4].…”

Section: Introductionmentioning

confidence: 99%

A novel five-wire micro anemometer with 3D directionality for low speed air flow detection and acoustic particle velocity detecting capability

Chang

Gao

2018

J. Micromech. Microeng.

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In this paper, a novel five-wire micro-fabricated anemometer with 3D directionality based on calorimetric principle is proposed, which is capable of measuring low speed airflow. This structure is realized by vertically bonding two different dies, which can be fabricated on the same wafer resulting in a simple fabrication process. Experiments on speed lower than 200 mm s−1 are conducted, showing good repeatability and directionality. The speed of airflow is controlled by the volumetric flow rate. The measured velocity sensitivity is 9.4 mV · s m−1, with relative direction sensitivity of 37.1 dB. The deviation between the expected and the measured directivity is analyzed by both theories and simulations. A correction procedure is proposed and turns out to be useful to eliminate this deviation. To further explore the potential of our device, we expose it to acoustic plane waves in a standing wave tube, showing consistent planar directivity of figure of eight. The measured velocity sensitivity at 1 kHz and 120 dBC is 4.4 mV · s m−1, with relative direction sensitivity of 27.0 dB. By using the correction method proposed above, the maximum angle error is about ±2°, showing its good directionality accuracy.

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Hot-Wire Calibration at Low Velocities: Revisiting the Vortex Shedding Method

Cited by 5 publications

References 36 publications

Experimental Stand for Very-Low-Velocity Gas Flow Generation

Experimental Stand for Very-Low-Velocity Gas Flow Generation

Hot-film/hot-wire anemometer calibration for low velocities using image processing

A novel five-wire micro anemometer with 3D directionality for low speed air flow detection and acoustic particle velocity detecting capability

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