Results 211 to 220 of about 14,276 (253)
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Vacuum, 2002
Abstract In this work we present results concerning the composition and structure of intrinsic thin film silicon carbide alloys obtained by hot wire and hot wire plasma assisted techniques using ethylene as carbon gas source. The data show that by increasing the percentage of ethylene in the gas mixture from 14% to 60% the optical band gap is ...
I Ferreira +3 more
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Abstract In this work we present results concerning the composition and structure of intrinsic thin film silicon carbide alloys obtained by hot wire and hot wire plasma assisted techniques using ethylene as carbon gas source. The data show that by increasing the percentage of ethylene in the gas mixture from 14% to 60% the optical band gap is ...
I Ferreira +3 more
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A hot-wire measurement technique for complex turbulent flows
1st National Fluid Dynamics Conference, 1988A hot-wire technique is described which can be used to measure all three components of the local mean velocity vector and all six components of the Reynolds stress tensor in a low-intensity turbulent flow which is arbitrarily skewed in pitch and yaw by as much as 30 degrees.
M. AL-BEIRUTTY +2 more
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A crossed hot-wire technique for complex turbulent flows
Experiments in Fluids, 1991This paper describes a crossed hot-wire technique for the measurement of all components of mean velocity, Reynolds stresses, and triple products in a complex turbulent flow. The accuracy of various assumptions usually implicit in the use of crossed hot-wire anemometers is examined.
A. D. Cutler, P. Bradshaw
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A technique for cleaning hot-wires used in anemometry
Journal of Scientific Instruments, 1953When a hot-wire is exposed to an air-stream near an industrial area, it collects a deposit consisting of particles of soot and tar. The deposit, by changing the heat-loss from the wire, can decrease the sensitivity by as much as 20%. Even in cleaned air, the useful life of a hot-wire may be no more than 2 hours.
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Fundamental Aspects of Viscosity Monitoring by the Hot Wire Technique
Journal of Food Science, 1990ABSTRACT Fundamental aspects of the monitoring of viscosity by the hot wire technique in stagnant test fluid was investigated. The behavior of the hot wire viscosity sensor was well described, theoretically, by the stagnant layer analysis combined with the Ostrach solution for natural convection heat‐transfer from a vertical plate. To
OSATO MIYAWAKI +4 more
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Experiments in Fluids, 2003
Thermal anemometry is a classic flow-velocity measurement technique that is known to suffer from the inability to discern the flow direction. The current paper describes an innovative approach whereby an oscillating hot wire is used to extract velocity direction and magnitude information from single hot-wire measurements.
Y. Li, A. Naguib
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Thermal anemometry is a classic flow-velocity measurement technique that is known to suffer from the inability to discern the flow direction. The current paper describes an innovative approach whereby an oscillating hot wire is used to extract velocity direction and magnitude information from single hot-wire measurements.
Y. Li, A. Naguib
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Applied Surface Science, 2001
In this work, we report the optical and compositional properties of hydrogenated amorphous silicon carbide (a-SiC:H) thin films produced by plasma-enhanced chemical vapor deposition (PE-CVD), hot wire CVD (HW-CVD) and hot wire plasma-assisted CVD (HWPA-CVD) processes.
I. Ferreira +6 more
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In this work, we report the optical and compositional properties of hydrogenated amorphous silicon carbide (a-SiC:H) thin films produced by plasma-enhanced chemical vapor deposition (PE-CVD), hot wire CVD (HW-CVD) and hot wire plasma-assisted CVD (HWPA-CVD) processes.
I. Ferreira +6 more
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Measurement of the properties of liquids and gases using a transient hot-wire technique
Review of Scientific Instruments, 1978A transient method of making simultaneous, in situ measurements of the thermal conductivity, volumetric specific heat, and kinematic viscosity of liquids and gases is presented. The technique utilizes the temperature response record of a fine horizontal wire, functioning as a resistance thermometer, when subjected to a sudden and constant electrical ...
J R, Parsons, J C, Mulligan
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Multiposition hot-wire technique for the study of swirling flows in vortex chambers
Experimental Thermal and Fluid Science, 1993Abstract A multiposition single-slant hot-wire probe technique for the study of a three-dimensional confined vortex flow is described. Most of the previously reported observations of confined swirling flows were obtained by flow visualization or by using relatively large pressure probes. However, swirling flows are extremely sensitive to disturbances
A. Fitouri, M.K. Khan, H.H. Bruun
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The Hot-Wire Technique in Supersonic Research
2011For the last few years considerable attention has been turned to the problem of turbulence in supersonic flows. There are several new aspects to the compressible case that are of great academic and practical interest. In particular, one should mention the problems of the onset of supersonic turbulence (transition) and of the aerodynamic noise. Although
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