Volume 19, Issue 5 (May 2019)
Modares Mechanical Engineering 2019, 19(5): 1275-1282 |
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Farsad S, Ardekani M, Farhani F. Experimental Investigation on Negative Values of Yaw Sensitivity Coefficient for Hot Wire Anemometer Sensor in Two-dimensional Flow Measurement. Modares Mechanical Engineering 2019; 19 (5) :1275-1282
URL: http://mme.modares.ac.ir/article-15-22008-en.html
URL: http://mme.modares.ac.ir/article-15-22008-en.html
1- Mechanical Engineering Research Center, Iranian Research Organization for Science and Technology (IROST), Tehran, Iran
2- Mechanical Engineering Research Center, Iranian Research Organization for Science and Technology (IROST), Tehran, Iran ,f.farhani@irost.ir
2- Mechanical Engineering Research Center, Iranian Research Organization for Science and Technology (IROST), Tehran, Iran ,
Abstract: (3642 Views)
In two-dimensional measurements using hot wire anemometer, the sensitivity of the sensor to change the flow direction of direction or of of particular importance. flow velocity vector and heat transfer from the hot wire sensor is determined, using the Yaw sensitivity function and its coefficient. In some cases, negative values of Yaw sensitivity coefficient 
are encountered, for which no specific reason has been presented. In this paper, reason of negative values of 
for un-plated sensors of hot wire anemometer in two-dimensional measurements have been investigated experimentally. For this purpose, flow velocity field between the prongs of a model of a normal probe (SN) at different velocities and Yaw angles have been studied. Results show that the probe’s prongs produce flow disturbances, which cause a reduction in flow velocity and the deviation (rotation) of the flow adjacent to the prongs and the sensor. At different Yaw angles, the maximum reduction in flow velocity amounts to 3% and the deviation of flow direction has a maximum of 6.3°. It is supposed that this phenomenon affects the amount of heat transfer from the sensor and the effective velocity obtained by the hot wire anemometer, which eventually produces the reported negative values.
are encountered, for which no specific reason has been presented. In this paper, reason of negative values of for un-plated sensors of hot wire anemometer in two-dimensional measurements have been investigated experimentally. For this purpose, flow velocity field between the prongs of a model of a normal probe (SN) at different velocities and Yaw angles have been studied. Results show that the probe’s prongs produce flow disturbances, which cause a reduction in flow velocity and the deviation (rotation) of the flow adjacent to the prongs and the sensor. At different Yaw angles, the maximum reduction in flow velocity amounts to 3% and the deviation of flow direction has a maximum of 6.3°. It is supposed that this phenomenon affects the amount of heat transfer from the sensor and the effective velocity obtained by the hot wire anemometer, which eventually produces the reported negative values.
Article Type: Original Research |
Subject:
Experimental Fluid Mechanics
Received: 2018/06/12 | Accepted: 2018/12/17 | Published: 2019/05/1
Received: 2018/06/12 | Accepted: 2018/12/17 | Published: 2019/05/1
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