A micro-scale hot wire anemometer based on low stress (Ni/W) multi-layers deposited on nano-crystalline diamond for air flow sensing

2015 ◽  
Vol 25 (12) ◽  
pp. 125029 ◽  
Author(s):  
A Talbi ◽  
L Gimeno ◽  
J-C Gerbedoen ◽  
R Viard ◽  
A Soltani ◽  
...  
Keyword(s):  
Air Flow ◽  
Hot Wire ◽  
Micro Scale ◽  
Flow Sensing ◽  
Nano Crystalline

scholarly journals Pulsating Flow Characteristics of Hot-Wire Air Flow Meter for Gasoline Fuel-Injection System.

1993 ◽  
Vol 59 (559) ◽  
pp. 935-940
Author(s):  
Yoshishige Ohyama ◽  
Khotarou Hirasawa ◽  
Yutaka Nishimura ◽  
Minoru Ohsuga ◽  
Mamoru Fujieda
Keyword(s):  
Fuel Injection ◽  
Air Flow ◽  
Flow Characteristics ◽  
Pulsating Flow ◽  
Injection System ◽  
Fuel Injection System ◽  
Hot Wire ◽  
Flow Meter

A New Approach about Heat Transfer of Hot-Wire Anemometer

2012 ◽  
Vol 232 ◽  
pp. 747-751 ◽  
Author(s):  
Mojtaba Dehghan Manshadi ◽  
Mohamad Kazemi Esfeh
Keyword(s):  
Heat Transfer ◽  
Ambient Temperature ◽  
Air Flow ◽  
Accurate Method ◽  
Fundamental Principle ◽  
Effect Of Temperature ◽  
Hot Wire ◽  
Temperature Drift ◽  
Flow Temperature ◽  
Temperature Variations

The hot-wire anemometer is a famous thermal transducer for turbulence measurements. The fundamental principle of hot-wire anemometer is based on the convective heat transfer, since the heat transfer is directly proportional to the temperature difference between the sensor and the fluid, hence ambient temperature variations are one of the most important error sources in the measurements with the hot-wire anemometers. Many methods have been proposed to compensate for the ambient temperature variations. In such methods the effect of temperature drift is only considered and the effect of Nusselt number is ignored. In the present research the effect of air flow temperature variations on the response of constant temperature anemometer has been studied experimentally. Furthermore, with the basis of air flow velocity and ambient temperature variations, the percentage errors in velocity measurements have been estimated. Finally, based on achieved results, an accurate method has been proposed to compensate the air flow temperature variations.

Performances of Nano/Amorphous Silicon Films Produced by Hot Wire Plasma Assisted Technique

1998 ◽  
Vol 507 ◽  
Author(s):  
I. Ferreira ◽  
H. Águas ◽  
L. Mendes ◽  
F. Fernandes ◽  
E. Fortunato ◽  
...  
Keyword(s):  
Amorphous Silicon ◽  
Transport Properties ◽  
Oxygen Content ◽  
Hydrogen Content ◽  
Crystalline Silicon ◽  
Silicon Films ◽  
Hot Wire ◽  
Hydrogen Dilution ◽  
Nano Crystalline ◽  
Doped Silicon

ABSTRACTThis work reports on the performances of undoped and n doped amorphous/nano-crystalline silicon films grown by hot wire plasma assisted technique. The film's structure (including the presence of several nanoparticles with sizes ranging from 5 nm to 50 nm), the composition (oxygen and hydrogen content) and the transport properties are highly dependent on the filament temperature and on the hydrogen dilution. The undoped films grown under low r.f. power (≍ 4 mWcm−2) and with filament temperatures around 1850 °K have dark conductivities below 10−1Scm−1, optical gaps of about 1.5 eV and photo-sensitivities above 105, (under AM3.5), with almost no traces of oxygen content. N- doped silicon films were also fabricated under the same conditions which attained conductivities of about 10−2Scm−1.

scholarly journals Air velocity distribution of the circumferentially arranged nozzle group

2018 ◽  
Vol 22 (4) ◽  
pp. 1589-1593 ◽  
Author(s):  
Chen-Yang Xu ◽  
Li-Li Wu ◽  
Ting Chen
Keyword(s):  
Flow Field ◽  
Velocity Distribution ◽  
Air Flow ◽  
Hot Wire ◽  
Air Velocity ◽  
Centrifugal Spinning

The air-flow field of the circumferentially arranged nozzle group is modeled and simulated. The air velocity distribution is measured using a hot wire anemometer. The results show that the simulated velocities coincide with the measured ones, confirming the effectiveness of the model. Larger rotating speeds can yield larger air velocities, indicating that introducing auxiliary air is favorable to the polymer drawing in the centrifugal spinning.

Design of a Low-Turbulence Facility for Micro-Scale Aerodynamics

2002 ◽  
Author(s):  
Michael J. Martin ◽  
Iain D. Boyd ◽  
Luis P. Bernal
Keyword(s):  
Wind Tunnel ◽  
Cross Section ◽  
Uniform Flow ◽  
Geometric Constraints ◽  
Velocity Data ◽  
Hot Wire ◽  
Micro Scale ◽  
Wire Probe ◽  
Successful Design ◽  
Lift And Drag

A novel wind-tunnel facility has been designed for measurement of lift and drag on micromachined airfoils. Due to the structural and geometric constraints of the airfoils being tested, the wind tunnel has a 1-centimeter cross-section. This small size allows the use of a 100-1 contraction area, and extremely fine turbulence screens, creating an ultra-low turbulence facility. Preliminary velocity data obtained with a hot-wire probe indicate a successful design, with uniform flow, and turbulence intensities below 1%.

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