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Solid flux measurement in a solid-liquid micro-circulating fluidised bed

Lookup NU author(s): Dr Vladimir Zivkovic, Emeritus Dr David Reay


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Solid-liquid circulating fluidised beds (CFB) have found industrial applications in many processes due to their good characteristics such is excellent particle-liquid contact, but have not yet been applied in the micro technology context. Solid-liquid micro circulating fluidised beds (|iCFBs), which essentially involve fluidisation of microparticles in sub-centimetre beds, hold promise of applications in the microfluidics and micro-process technology context. From an engineering standpoint, it is vital to know the solid flux, since that dictates the bed capability and operability as processing equipment. Albeit there are several studies on solid flux measurement in CFBs, we are presenting the first experimental study on solid flux measurement in a CFB at micro-scale. The experimental research was performed in a micro-CFB which was made by micromachining channels of 1mm2 cross section in Perspex. PMMA and soda lime glass microparticles were used as the fluidised particles and tap water as the fluidising liquid. The digital particle image velocimetry (PIV) method was used as a novel measurement technique to measure the solid flux in the micro-CFB system. The critical transition velocity, Ucr, is approximately equal to the particle terminal velocity, Ut. As in macroscopic CFBs system, Ucr decreased with solid inventory (1-9%) before levelling off at a high enough solid inventory (10-25%) and it increases with reduction in particle size and density.

Publication metadata

Author(s): Zivkovic V, Do Nascimento OL, Reay DA

Publication type: Conference Proceedings (inc. Abstract)

Publication status: Published

Conference Name: 12th International Conference on Fluidized Bed Technology, CFB 2017

Year of Conference: 2017

Pages: 533-540

Acceptance date: 23/05/2017

Publisher: Warsaw University of Technology