283274 ECVT Imaging of 3-D Flow Structures of Irregular Geomteric Multi-Phase Flow Systems

Monday, October 29, 2012: 2:15 PM
Conference C (Omni )
Aining Wang, Qussai Marashdeh and L. - S. Fan, William G. Lowrie Department of Chemical and Biomolecular Engineering, The Ohio State University, Columbus, OH


Aining Wang, Qussai Marashdeh and Liang-Shih Fan*

William G. Lowrie Department of Chemical and Biomolecular Engineering

The Ohio State University

140 West 19th Avenue, Columbus, Ohio 43210, USA

 *To whom correspondence should be addressed (fan@chbmeng.ohio-state.edu)

Measuring the dynamic flow structure in multi-phase flow systems requires a 3-D technique that is capable of sensing the flow field in real-time. Electrical Capacitance Volume Tomography (ECVT) is a newly developed technique that can provide such measurement. In ECVT, a set of non-invasive capacitance sensors are placed around a measurement section of the flow field. Sensors interact with each other collecting real-time measurements that can be related back to phase concentrations in the section. The technique is based on reconstructed volume images from capacitance signals acquired from sensors with inherent 3D features. The attractiveness of the technique is in its low profile sensors, fast imaging speed and scalability to different section sizes, low operating cost, and safety. Moreover, the flexibility of ECVT sensors enables them to be designed around virtually any geometry of the columns. The feasibility and accuracy of the ECVT technique for volume imaging have been demonstrated for various multiphase flow systems including those of a large circular column of 60 inches, with internals, at high temperatures, and with varied shapes.

In this work, an ECVT sensing system is utilized to examine gas-solid flows in irregular shaped conduits of a circulating fluidized bed. Specifically, volume images will be acquired and analyzed of elbow, cylindrical, and converged sections of the flow system. The results will be analyzed quantitatively. Results of volume solid holdup distributions will be reported also. The multi-phase flow system under interrogation will be examined at various flow conditions.

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