A non-skiving tape head with sub-ambient air pressure cavities

2015 ◽  
Author(s):  
J. B. Engelen ◽  
V. Jonnalagadda ◽  
S. Furrer ◽  
H. Rothuizen ◽  
M. Lantz
Keyword(s):  
Ambient Air ◽  
Air Pressure

Effects of Ambient Air Pressure on Femtosecond Laser Induced Periodic Ripple Structure on Chromium Films

2018 ◽  
Vol 47 (7) ◽  
pp. 714001
Author(s):  
刘琦 LIU Qi ◽  
张楠 ZHANG Nan ◽  
杨建军 YANG Jian-jun
Keyword(s):  
Femtosecond Laser ◽  
Ambient Air ◽  
Air Pressure ◽  
Ripple Structure ◽  
Chromium Films

Influence of Ambient Air Pressure on Pressure-Swirl Atomization

1987 ◽  
Author(s):  
X. F. Wang ◽  
A. H. Lefebvre
Keyword(s):  
Drop Size ◽  
Cone Angle ◽  
Ambient Air ◽  
Air Pressure ◽  
Spray Angle ◽  
Flow Number ◽  
Spray Cone Angle ◽  
Spray Cone ◽  
Continuous Increase ◽  
Pressure Swirl

The spray characteristics of six simplex atomizers are examined in a pressure vessel using a standard light diffraction technique. Attention is focused on the effects of liquid properties, nozzle flow number, spray cone angle, and ambient air pressure on mean drop size and drop-size distribution. For all nozzles and all liquids it is found that continuous increase in air pressure above the normal atmospheric value causes the SMD to first increase up to a maximum value and then decline. An explanation for this characteristic is provided in terms of the measurement technique employed and the various competing influences on the overall atomization process. The basic effect of an increase in air pressure is to improve atomization, but this trend is opposed by contraction of the spray angle which reduces the relative velocity between the drops and the surrounding air, and also increases the possibility of droplet coalescence.

Ambient Air Effects on Electrical Transport Properties of ZnO Nanorod Transistors

2008 ◽  
Vol 8 (11) ◽  
pp. 5929-5933 ◽  
Author(s):  
Jae Young Park ◽  
Ju-Jin Kim ◽  
Sang Sub Kim
Keyword(s):  
Transport Properties ◽  
Electrical Transport ◽  
High Vacuum ◽  
Ambient Air ◽  
Air Pressure ◽  
Zno Nanorod ◽  
Electrical Transport Properties ◽  
Large Shift ◽  
Oh Groups ◽  
Drain Electrode

ZnO nanorod (NR) transistors were fabricated in a back-gated structure, and their electrical transport properties were investigated as a function of air pressure. A large shift (19.4 V) of threshold voltage Vt, g toward negative gate bias is observed as the air pressure decreases to 9.06 × 10−4 Pa. The shift of Vt, g and the change in the flowing current between the source and drain electrode with changing the air pressure are fully reversible. The adsorption and desorption of oxygen molecules and/or OH groups in air are likely to be responsible for the reversibility. Most importantly, the electron concentration and the flowing current rapidly change only in a vacuum regime less than a certain pressure as likely as 1.33 × 10−1 Pa. In contrast, in the low vacuum regime (>1.33 × 10−1 Pa) ZnO NR transistors are insensitive to the change of air pressure. This observation indicates that nanosized vacuum sensors based on ZnO NR transistors will be effective only in the high vacuum regime.

Effect of ambient air pressure on the oxidation kinetics of Fe–6at.% Si alloy

2008 ◽  
Vol 50 (9) ◽  
pp. 2580-2587 ◽  
Author(s):  
Abdel-Rahman Lashin ◽  
Oldřich Schneeweiss ◽  
Yvan Houbaert
Keyword(s):  
Oxidation Kinetics ◽  
Ambient Air ◽  
Air Pressure ◽  
Kinetics Of

Effect of low ambient air pressure on spray characteristics of water mist

2015 ◽  
Vol 66 ◽  
pp. 7-12 ◽  
Author(s):  
Xishi Wang ◽  
Pei Zhu ◽  
Yuan Li ◽  
Xiaomin Ni ◽  
Minghao Fan
Keyword(s):  
Ambient Air ◽  
Water Mist ◽  
Air Pressure ◽  
Spray Characteristics

Comparative studies of wet oxidation of ammonium compounds using persulfate at temperatures of 313–343K under ambient air pressure

2014 ◽  
Vol 250 ◽  
pp. 205-213 ◽  
Author(s):  
Taichi Nakamura ◽  
Ryo Uchida ◽  
Mitsuhiro Kubota ◽  
Hitoki Matsuda ◽  
Tadashi Fukuta
Keyword(s):  
Comparative Studies ◽  
Ambient Air ◽  
Air Pressure ◽  
Wet Oxidation ◽  
Ammonium Compounds

Experimental Study of Air-Assist Atomizers for Fogging Systems

2006 ◽  
Author(s):  
Y. Levy ◽  
V. Sherbaum ◽  
V. Ovcharenko ◽  
S. P. Levitsky ◽  
M. P. Levitsky
Keyword(s):  
Gas Turbines ◽  
Water Injection ◽  
Ambient Air ◽  
Vortex Chamber ◽  
Air Pressure ◽  
Flow Rate Ratio ◽  
Liquid Pressure ◽  
Spray Cone ◽  
Input Pressure ◽  
Temperature Water

It is known that the temperature of the ambient air significantly affects the power output of gas turbines. To decrease inlet air temperature water injection at the intake of the turbine is commonly used. Existing air-assist atomizers consume significant more energy in the form of high-pressure air (about 6 bars) as compared to the jet impinging ones. Two new designs of the air-assist atomizers for fogger system are developed and studied. These atomizers differ from the existing ones by special air vortex chamber. It enables to achieve high tangential air velocities and reduce air input pressure. It is shown that at air pressure drop of 0.75–1 bar, the Sauter Mean Diameter of droplets is in the range from 20 to 25 μm when air-to-liquid flow rate ratio is equal to 4:1. Water supply pressure was in the range of 0.5–1 bar during the tests and its value did not markedly affected droplets diameter. It is expected that during optimization of the design and operating condition (air and liquid pressure), the size of the droplets would be further reduced. When air pressure was above 1 bar the droplets diameter was almost not affected by this parameter. Droplet velocity and droplet flux distribution along spray radius were also measured. It was found that the droplets distribution along radius is almost uniform. Spray cone was 30° for one device and 90° for the other.

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