Study of pulsating flow in close-coupled catalyst manifolds using phase-locked hot-wire anemometry
نویسندگان
چکیده
منابع مشابه
Hot-wire anemometry for superfluid turbulent coflows.
We report the first evidence of an enhancement of the heat transfer from a heated wire to an external turbulent coflow of superfluid helium. We used a standard Pt-Rh hot-wire anemometer and overheat it up to 21 K in a pressurized liquid helium turbulent round jet at temperatures between 1.9 K and 2.12 K. The null-velocity response of the sensor can be satisfactorily modeled by the counterflow m...
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We investigate spatial resolution issues in hot-wire anemometry measurements of turbulence intensity and energy spectra. Single normal hot-wire measurements are simulated by means of filtering direct numerical simulation (DNS) of turbulent channel flow at Res 1⁄4 934. Through analysis of the two-dimensional energy spectra from the DNS, the attenuation of the small-scale energy levels is documen...
متن کاملOn the use of hot-wire anemometry in pulsating flows. A comment on ‘A critical review on advanced velocity measurement techniques in pulsating flows’
In their recent topical review, Nabavi and Siddiqui (Meas. Sci. Technol. 2010 21 042002) recommended the use of hot-wire anemometry for velocity measurements in pulsating flows, especially at high frequency. This recommendation is misleading. The procedures invoked by these authors are valid only for small-amplitude fluctuations, which are of little interest for pulsating flows. When large-ampl...
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Accurate calibration is imperative to obtain reliable flow measurements using hot-wire anemometry. Calibration errors owing to temperature drift, wire degradation, changes in ambient conditions etc can lead to substantial uncertainties in hot-wire measurements. A new calibration procedure is implemented here to account for most forms of drift that are typically encountered during high quality f...
متن کاملA new criterion for end-conduction effects in hot-wire anemometry
The effect of end conduction on constant temperature hot-wire anemometry was studied. A new parameter, = ( /d)√4a(kf /k)Nu, is proposed to describe the significance of end conduction more comprehensively than the commonly used length-to-diameter ratio /d, in that it allows for material property variations, resistance ratio and Reynolds number effects. Numerical and experimental data are used to...
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ژورنال
عنوان ژورنال: Experiments in Fluids
سال: 2004
ISSN: 0723-4864,1432-1114
DOI: 10.1007/s00348-003-0683-0