Download PDF by Klaus A. Hoffmann, Steve T. Chiang: Computational fluid dynamics

By Klaus A. Hoffmann, Steve T. Chiang

ISBN-10: 0962373168

ISBN-13: 9780962373169

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This, along with the known cross-sectional area of the capillary, can be used to estimate the bubble volume. With the assumption of a spherical bubble a diameter for the bubble can be computed. The schematic of the system is illustrated in Fig. 10. Greaves and Kobbacy (1984) and Pilhofer et al. (1974) have used this method for bubble size estimation. Transmitter Receiver Bubbles Figure 9 Measurement principle of the Ultrasound Doppler technique. 26 Non-Invasive Monitoring of Multiphase Flows Reactor Wall Light Sources _cro3__o"-__0| (o - ^ i 1 I I Pump Bubble Phototransislors Oo - /o\ : "I _ -o K^ Figure 10 The isokinetic sampling probe.

Resistance Thermometer Heat Transmitter Figure 12 Arrangement of probes for the heat pulse technique. 34 Non-Invasive Monitoring of Multiphase Flows A technique which is similar to PIV is Laser Induced Photochemical Anemometry (LIPA) in which the liquid and/or the solid phase is doped with photoexcitable chemicals which, upon excitation by a beam of laser, enables the identification of points in the flow. The laser highlighted regions are imaged at successive times, in a manner similar to PIV, and from their displacement by the flow, information concerning the velocity field can be inferred.

1994). By this approach, all the variables influencing the radiation measurement process such as geometry, the attenuation of the flovmig media are accounted for. , 1996). , 1995). In addition to the laborious procedure of calibration, it also appears that one needs to match the particle density to the dynamic density of the dispersion rather than that of the fluid itself Like the LIP A, CARPT is also a method that can be implemented and used conveniently only for laboratory of pilot scale reactors.

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Computational fluid dynamics by Klaus A. Hoffmann, Steve T. Chiang

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