Vortex Shedding From Cylinders and the Resulting Unsteady Forces and Flow Phenomena Part II

Fleischmann, Shirley; Sallet, D. W.

doi:10.1177/058310248101301205

Cited by 4 publications

(3 citation statements)

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“…In addition to probe oscillations caused by collisions with individual particles, the probe also responds to fluidinduced oscillations caused by periodic vortex shedding from the probe. The probe Reynolds number Re C = DU/ν varies from 6100 to 18 400 in our experiments, so the probe flow field is laminar with a vortex shedding Strouhal number Sh = f v D/U of approximately 0.2, where f v is the vortex shedding frequency [36]. For the experimental conditions examined in this study, this Strouhal number corresponds to a vortex shedding frequency of between 210 and 640 Hz.…”

Section: Sensor Analysismentioning

confidence: 86%

“…For the experimental conditions examined in this study, this Strouhal number corresponds to a vortex shedding frequency of between 210 and 640 Hz. The probe lift force oscillates at the vortex shedding frequency and the drag force oscillates at a frequency f d equal to twice the vortex shedding frequency [36]. Lashkov [35], in a study of the effect of micron-size particles on the drag force acting on a cylinder, reports that particles can induce early onset of turbulence in the cylinder wake, thereby decreasing the critical Reynolds number for drag crisis.…”

Section: Sensor Analysismentioning

confidence: 99%

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Vibration sensor for particle concentration measurement in pneumatic pipeline flows

Meunier

Watts

Marshall

et al. 2010

Meas. Sci. Technol.

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Accurate measurements of pneumatically driven particle mass flow rate and particle size are necessary in order to maintain optimal combustion efficiency in coal-fired power plants and cement manufacturing facilities, as well as numerous other operations which are fed by multiple particle injection ports. Existing sensors for pneumatic particle concentration, such as concentration sensors, are typically prohibitively expensive and their measurements are sensitive to particle moisture content. A new sensor was developed for particle concentration measurement in pneumatic pipeline flow based on measurement of particle effects on fluid-induced oscillations of a probe extending into the flow. Since fluid-induced oscillations occur at a much lower frequency than do particle collisions, the measurements can be made with much simpler and less expensive equipment than is the case with impact sensors that attempt to resolve individual particle collisions. Experimental tests indicate three statistical measures of the probe acceleration data that exhibit smooth variation with the particle diameter and concentration data. The experimental data are used to train a neural net, which serves to interpolate the data. It is found that by training the neural net data on the statistical measures of the sensor probe acceleration, information on the particle concentration field can be extracted with a reasonable degree of accuracy.

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Section: Sensor Analysismentioning

confidence: 86%

Section: Sensor Analysismentioning

confidence: 99%

Vibration sensor for particle concentration measurement in pneumatic pipeline flows

Meunier

Watts

Marshall

et al. 2010

Meas. Sci. Technol.

View full text Add to dashboard Cite

show abstract

“…Both the drag coefficient Co and the Strouhal number (Str= d~ f/U describes the vortex shedding behind a cylinder) are well known functions of the cylinder Reynolds number over a wide range of Re (Cantwell and Coles 1983;Fleischman and Sallet 1981).…”

Section: Flow Around Cylindersmentioning

confidence: 99%