Measurement of local particle velocities and velocity distributions in gas-solid flows by means of the spatial filter method

Fiedler, O.; Werther, Joachim; Labahn, N.; Kumpart, J.; Christofori, K.

doi:10.1016/s0032-5910(97)03287-7

Cited by 15 publications

(9 citation statements)

References 10 publications

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“…Hence, to answer the above questions, and to properly understand the solids flow inside risers, it is first necessary to map the solids flow field inside a pilot-scale riser. Several researchers employed invasive methods such as pitot tubes, extraction probes, isokinetic probes, spatial filter processes, and optical fiber probes to characterize mean radial velocity profiles (Bader et al; 1 Miller and Gidaspow; 8 Harris et al; 9 Fiedler et al; 10 Parssinen and Zhu 4 ). Some noninvasive methods used were based on optical techniques such as PIV, LDV, and high-speed cameras (Rhodes et al; 11 Wang et al 12 ), while a few others were based on the use of radioisotopes, such as PEPT (Stellema 13 ) and radioactive particle tracking (Godfroy et al 14 ).…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of the Solids Velocity Field in Gas−Solid Risers

Bhusarapu

Al‐Dahhan

Duduković

et al. 2005

Ind. Eng. Chem. Res.

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Solids flow dynamics in gas-solid risers is inherently complex. Model refinement through experimental validation requires the acquisition of detailed nonintrusive measurements. In this study, noninvasive computer-automated radioactive particle tracking (CARPT) is employed to visualize and quantify in a three-dimensional domain the solids dynamics and mixing in gassolid risers. This technique has the added advantage that, along with the derived Eulerian solids flow field (time-average velocity map and various turbulence parameters such as the Reynolds stresses, turbulent kinetic energy), it also provides directly the Lagrangian description of the solids motion. The solids velocity field data are obtained in two different risers at low and high solids fluxes at varying superficial gas velocity to span both the fast-fluidized (FF) and dilute phase transport (DPT) regimes. The effect of operating conditions on solids flow and mixing is studied. Comparative analysis of the results is presented to provide insights into the complex solids flow patterns characteristic of gas-solid risers.

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Section: Introductionmentioning

confidence: 99%

Experimental Study of the Solids Velocity Field in Gas−Solid Risers

Bhusarapu

Al‐Dahhan

Duduković

et al. 2005

Ind. Eng. Chem. Res.

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“…The output signals of these sensors are cumulated (e.g. by means of a lens in optical systems (Fiedler et al, 1997). Bypassing inhomogeneities also have an impact on the readout of the measurement signals, of capacitive sensors, which is dependent on the media velocity and on the geometrical dimensions of the sensing volume.…”

Section: Spatial Filtering Principlementioning

confidence: 99%

Non-invasive measurements of fluids by means of capacitive sensors

Zangl

Fuchs

Bretterklieber

2009

Elektrotech. Inftech.

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“…The velocity of moving surfaces can be measured without contact using optical sensors, whose working principles are based on, e.g., correlation 6,7 or spatial filter 8,9 methods. Typically, such sensors have an optical system to project the object surface onto several detectors aligned in the direction of motion in its image plane.…”

Section: Noncontact Velocity Measurement With Optical Sensorsmentioning

confidence: 99%

Design of telecentric imaging systems for noncontact velocity sensors

Berger

2002

Opt. Eng

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Abstract. Optical sensors for noncontact velocity measurement require imaging systems with constant optical magnification in spite of the variable distance between the sensor and the object of measurement. This requirement can be met using telecentric systems. When such systems are set up, several design considerations must be taken into account. These concern the decision as to whether a single or a double telecentric system shall be used, as well as the choice of the optical magnification and the dimensioning of the aperture stop. The results of the theoretical analysis are confirmed by experiments with a prototype velocity sensor for belt drives.

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Measurement of local particle velocities and velocity distributions in gas-solid flows by means of the spatial filter method

Cited by 15 publications

References 10 publications

Experimental Study of the Solids Velocity Field in Gas−Solid Risers

Experimental Study of the Solids Velocity Field in Gas−Solid Risers

Non-invasive measurements of fluids by means of capacitive sensors

Design of telecentric imaging systems for noncontact velocity sensors

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