A flexible integrated micromachined hot-film sensor array for measuring surface flow vector

2011 ◽  
Author(s):  
R. Y. Que ◽  
R. Zhu ◽  
Q. Z. Wei ◽  
Z. Cao
Keyword(s):  
Sensor Array ◽  
Surface Flow ◽  
Film Sensor ◽  
Flow Vector ◽  
Measuring Surface ◽  
Hot Film ◽  
Hot Film Sensor

scholarly journals A Flexible Hot-Film Sensor Array for Underwater Shear Stress and Transition Measurement

Sensors ◽  
2018 ◽  
Vol 18 (10) ◽  
pp. 3469 ◽  
Author(s):  
Baoyun Sun ◽  
Pengbin Wang ◽  
Jian Luo ◽  
Jinjun Deng ◽  
Shiqi Guo ◽  
...  
Keyword(s):  
Shear Stress ◽  
Flat Plate ◽  
Sensor Array ◽  
Experimental Studies ◽  
Boundary Layer Transition ◽  
Empirical Formulas ◽  
Layer Transition ◽  
Film Sensor ◽  
Hot Film ◽  
Hot Film Sensor

A flexible hot-film sensor array for wall shear stress, flow separation, and transition measurement has been fabricated and implemented in experiments. Parylene C waterproof layer is vapor phase deposited to encapsulate the sensor. Experimental studies of shear stress and flow transition on a flat plate have been undertaken in a water tunnel with the sensor array. Compared with the shear stress derived from velocity profile and empirical formulas, the measuring errors of the hot-film sensors are less than 5%. In addition, boundary layer transition of the flat plate has also been detected successfully. Ensemble-averaged mean, normalized root mean square, and power spectra of the sensor output voltage indicate that the Reynolds number when transition begins at where the sensor array located is 1.82 × 105, 50% intermittency transition is 2.52 × 105, and transition finishes is 3.96 × 105. These results have a good agreement with the transition Reynolds numbers, as measured by the Laser Doppler Velocimetry (LDV) system.

Sensing elements space design of hot-film sensor array considering thermal crosstalk

2017 ◽  
Vol 265 ◽  
pp. 217-223 ◽  
Author(s):  
Baoyun Sun ◽  
Binghe Ma ◽  
Jian Luo ◽  
Boyuan Li ◽  
Chengyu Jiang ◽  
...  
Keyword(s):  
Sensor Array ◽  
Film Sensor ◽  
Space Design ◽  
Hot Film ◽  
Hot Film Sensor

Localization of Flow Separation and Transition Over a Pitching NACA0012 Airfoil at Transitional Reynolds Numbers Using Hot-Films

2015 ◽  
Vol 137 (12) ◽  
Author(s):  
Allison Poels ◽  
Daniel Rudmin ◽  
Azemi Benaissa ◽  
Dominique Poirel
Keyword(s):  
Reynolds Numbers ◽  
Correlation Technique ◽  
Film Sensor ◽  
Pitching Airfoil ◽  
Eddy Simulation ◽  
Naca0012 Airfoil ◽  
Large Eddy ◽  
Sensor Signals ◽  
Hot Film ◽  
Hot Film Sensor

Separation and transition of flow over a pitching airfoil at transitional Reynolds Number are analyzed experimentally. The method is based on a windowed correlation between hot-film sensor signals taken simultaneously or synchronized based on the airfoil pitch angle. A comparison with large eddy simulation (LES) simulation obtained in the same conditions is presented and discussed. Our results agree very well with the LES data for the separation location during the pitch-up. For the pitch-down, the results show differences with the LES. However, when the LES data are analyzed with the same correlation technique, the results are in a better agreement.

Unsteady heat film transfer from a thick hot-film sensor

10.2514/3.615 ◽  
1994 ◽  
Vol 8 (4) ◽  
pp. 797-799 ◽  
Author(s):  
Chong H. Park ◽  
Kevin D. Cole
Keyword(s):  
Film Sensor ◽  
Film Transfer ◽  
Hot Film ◽  
Hot Film Sensor

Carbon Nanotube Thermal Probe Using Platinum Nano Hot-Film

2009 ◽  
Author(s):  
Koji Takahashi ◽  
Jun Hirotani ◽  
Satoshi Kai ◽  
Tatsuya Ikuta
Keyword(s):  
Carbon Nanotube ◽  
Contact Point ◽  
Atmospheric Condition ◽  
Thermal Probe ◽  
Film Sensor ◽  
Thermal Sensing ◽  
Water Absorption Effect ◽  
Hot Film ◽  
Air Conduction ◽  
Hot Film Sensor

This paper reports on a thermal probe using a carbon nanotube (CNT) on a platinum hot-film. CNT probe is expected to breakthrough the limitations of the existing ones owing to its unique characteristics but no practical thermal device has been fabricated yet. In order to explore the mechanisms of heating and measuring the smaller region than 10nm, we applied our recently developed sensor coupled with CNT, which consists of a suspended platinum film of 40nm × 500nm × 10micrometer. The principle of this probe as heater and sensor is explained, based on one dimensional heat conduction. Fabrication process using MEMS technique is also introduced, especially for a couple of critical techniques. One is to fabricate the nano sensor on an edge of the sensor substrate. The other is to bond a CNT on the suspended hot-film sensor. A CNT thermal probe using a multi-walled CNT of 70nm diameter and ca. 10 micrometers length is successfully fabricated. Its performances are tested in vacuum environment as to eliminate the presence of in-air conduction effect and water absorption effect around the contact point, which work for heat transport dominantly in atmospheric condition and degrade the spatial resolution. Our CNT probe showed a clear and reliable signal in vacuum and its sensitivity available for nanoscale thermal sensing and heating is confirmed.

215 Development of micro-fabricated hot-film sensor by MEMS and study on its validation of the wall shear stress fluctuation measurement

2014 ◽  
Vol 2014.63 (0) ◽  
pp. _215-1_-_215-2_
Author(s):  
Takuya SAWADA ◽  
Osamu TERASHIMA ◽  
Yasuhiko SAKAI ◽  
Kouji Nagata ◽  
Mitsuhiro SHIKIDA ◽  
...  
Keyword(s):  
Shear Stress ◽  
Wall Shear Stress ◽  
Film Sensor ◽  
Stress Fluctuation ◽  
Wall Shear ◽  
Hot Film ◽  
Fluctuation Measurement ◽  
Hot Film Sensor
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