Results 241 to 250 of about 180,484 (283)

Some studies on hot-wire calibration using Monte Carlo technique

Journal of Physics E: Scientific Instruments, 1984
A numerical experiment has been used to determine the sample size required to accurately determine the calibration constants of hot wires. The method is based on a Monte Carlo simulation of the hot-wire response, for a prescribed set of conditions, by assuming a heat transfer model for the hot wire.
M K Swaminasthan, G W Rankin, K Sridhar
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The Hot-Wire Technique in Supersonic Research

2011
For 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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Experimental comparison of two hot-wire techniques in supersonic flow

AIAA Journal, 1989
The performance of two constant-temperature normal hot-wire techniques for resolution of turbulent mass flux and local stagnation temperature in a supersonic flow is examined. The first technique used a single wire and the rapid scanning of multiple overheat ratios.
D. A. Walker, W. F. Ng, M. D. Walker
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Fundamental Aspects of Viscosity Monitoring by the Hot Wire Technique

Journal of Food Science, 1990
ABSTRACT 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, YUJI SATO, TOSHIMASA YANO, KENSUKE ITO, YUKIHIRO SAEKI   +4 more
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Development and application of a quadruple hot-wire technique for turbulent flows

Measurement Science and Technology, 1996
An 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., Staeger, R., Kreplin, H.-P.   +2 more
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A technique for cleaning hot-wires used in anemometry

Journal of Scientific Instruments, 1953
When 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, 1985
This 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, 1998
ABSTRACTThe 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, M. Vanecek, A. Poruba, V. Vorlicek, R. S. Crandall, D. L. Williamson   +5 more
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Hot-wire measurement procedures and their appraisal through a simulation technique

Journal of Physics E: Scientific Instruments, 1987
The 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, 1988
The 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, B. Taxis, H. M. Roder, W. A. Wakeham   +3 more
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