Results 271 to 280 of about 180,663 (310)
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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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Development and application of a quadruple hot-wire technique for turbulent flows
Measurement Science and Technology, 1996An analytical evaluation method to compute the instantaneous velocity vector from the signals of multiple hot-wire probes with nearly arbitrary geometry was developed. The domain of flow angles, in which for any given set of measured sensor voltages only one single solution for the instantaneous velocity vector exists, was determined for several probe ...
Rosemann, H. +2 more
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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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Measurement of Swirling Flow Field Using the Single Slanted Hot-Wire Technique
Volume 1: Aircraft Engine; Turbomachinery, 1985This paper presents the use of a single slanted hot wire to measure the three velocity components of a swirling flow field. In its usage, the hot wire probe has been calibrated in a subsonic air jet for both speed and direction. It was then used to measure the swirling flow field associated with the presence of an inlet model.
H.W. Shin, Z.A. Hu
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Low Defect Density Microcrystalline-Si Deposited by the Hot Wire Technique
MRS Proceedings, 1998ABSTRACTThe optical and electronic properties of a series of microcrystalline silicon (μ-Si) films, deposited by the hot wire (HW) technique, are reported. Preliminary results suggest, using moderate H2 /SiH4 dilution ratios and substrate temperatures (320°C), high filament temperatures, and no H gas purifier, that the subgap absorption for these films,
A. H. Mahan +5 more
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Hot-wire measurement procedures and their appraisal through a simulation technique
Journal of Physics E: Scientific Instruments, 1987The general response equations for a hot wire arbitrarily placed in a moderately three-dimensional turbulent flow are derived. These equations are then used to develop two procedures to evaluate the mean velocity vector and the whole Reynolds stress tensor through digital processing of the signals from single or x-wire probes successively positioned at
BURESTI, GUIDO, DI COCCO N. R.
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Thermal diffusivity measurement by the transient hot-wire technique: A reappraisal
International Journal of Thermophysics, 1988The theory of the transient hot-wire technique for thermal conductivity measurements is reassessed in the special context of thermal diffusivity measurements. A careful examination of the working equation and an error analysis are employed to identify the principal sources of error.
C. A. Nieto de Castro +3 more
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High quality hydrogenated amorphous germanium prepared by the hot wire technique
Applied Physics Letters, 1995Hydrogenated amorphous germanium films were deposited by thermal dissociation of undiluted germane. The optical and electronic properties of the material were investigated using infrared spectroscopy (IR), photothermal deflection spectroscopy, spectroscopic ellipsometry, and conductivity measurements.
L. Zanzig, W. Beyer, H. Wagner
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A simple automated hot-wire positioning technique for near-wall measurements
Experiments in Fluids, 1993A simple hot-wire sensor positioning technique is presented. The technique is easily integrated with a personal computer to achieve a completely automated system. A single initial calibration of the system outside of the test section is all that is necessary and no subsequent manual re-positioning is required during experimentation.
G. Papadopoulos, M. V. Ötügen
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Nanocrystalline Undoped Silicon Films Produce by Hot Wire Plasma Assisted Technique
MRS Proceedings, 2000ABSTRACTIn this work, we show results concerning electro-optical properties, composition and morphology of nanocrystalline hydrogenated undoped silicon (nc-Si:H) films produced by hot wire plasma assisted chemical vapour deposition process (HWPA-CVD) and exhibiting a compact granular structure, as revealed by SEM micrographs.
Isabel M.M. Ferreira +4 more
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