Baiazitov, I.

Brem, G.

Jamil Ur Rahman, U.

Pozarlik, A.K.

English

Conventional spray dryers are known by their high capital and operating costs. Furthermore, low air inlet temperatures and small gas-solid slip velocities limited by gravity leads to low drying rates. In order to develop a commercially viable alternative spray drying technology, a high drying rate in a smaller volume must be achieved. In this study, the possibility of spray drying in a novel multi-zone vortex chamber is investigated using CFD tools. High-G fluidization in vortex chambers leads to intensification of interfacial heat, mass and momentum transfers. Additionally, due to small particle residence times, high air inlet temperatures can be employed that further enhances the drying rates.<br/

University of Twente Research Information

CFD study of spray drying in a lab scale multi-zone vortex chamber U. Jamil Ur Rahman, I. Baiazitov, A. K. Pozarlik, G. BremChair of Thermal Engineering, Faculty of Engineering Technology, University of Twente, The Netherlands.Conventional spray dryers are known by their high capital and operating costs. Furthermore, low air inlet temperatures and small gas-solid slipvelocities limited by gravity leads to low drying rates. In order to develop a commercially viable alternative spray drying technology, a highdrying rate in a smaller volume must be achieved. In this study, the possibility of spray drying in a novel multi-zone vortex chamber isinvestigated using CFD tools. High-G fluidization in vortex chambers leads to intensification of interfacial heat, mass, and momentum transfers[1]. Additionally, due to small particle residence times, higher air inlet temperatures can be employed that further enhances the drying rates.1. MOTIVATIONThis research is conducted within RVO-Vortex chamber II Project(TEEI115007). Authors would like to express their gratitude to RVO andto all project members for their contributions.o A 3D CFD model for spray drying in a vortex chamber wasdevelopedo Overall good agreement with the experimental datao 67 wt.% of product is lost via gas outletso Redesign of current vortex chamber is necessary to harvestits full drying potential1. De Wilde, J. and A. de Broqueville (2008). "Experimental investigation of a rotating fluidized bed in a static geometry." Powder Technology 183(3): 426-435.2. Tourneur, T. , A. de Broqueville and De Wilde, J (2018). Experimental and CFD study of multi-zone vortex chamber spray dryers. International Symposium on Chemical Reactor Engineering-ISCRE 25.o Parametric studies on the influence of solid outlet location on airflow patterns and droplet trajectorieso Influence of G-acceleration on separation efficiency5. CONCLUSIONSACKNOWLEDGMENTSREFERENCES2. CFD MODELonly air with water spray3. EXPERIMENTAL VALIDATIONwith multicomponent sprayonly air4b. RESULTS: Droplet trajectories4a. RESULTS: Temperature fields6. FUTURE WORKwater mass fractionparticle diameter

CFD study of spray drying in a lab scale multi-zone vortex chamber

https://ris.utwente.nl/ws/files/249937276/Jamil2018cfd.pdf

CFD study of spray drying in a lab scale multi-zone vortex chamber

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