Title of article :
Alternating mixing tabs in multifunctional heat exchanger-reactor
Author/Authors :
Habchi، نويسنده , , Charbel and Lemenand، نويسنده , , Thierry and Valle، نويسنده , , Dominique Della and Peerhossaini، نويسنده , , Hassan، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2010
Abstract :
Streamwise vortices are used in many applications for mixing processes, fast chemical reactions and heat-transfer enhancement. In this work we studied experimentally and numerically the effects of vorticity field redistribution on the turbulence energy dissipation rate in a modified geometry of the high-efficiency vortex (HEV) mixer, in which the mixing tab arrays are periodically rotated by 45° to better distribute the vorticity field. Attention focuses on the evolution and distribution of turbulence energy dissipation, since this describes quantitatively the drop breakup and turbulent micromixing mechanism, which controls fast chemical reactions. It is found that redistribution of the vorticity field locally intensifies turbulent micromixing relative to the classical HEV mixer, producing a local mixing intensification of up to 120%. In addition, the alternating vortex generator arrays improve homogenization of the turbulence field in the mixer.
Keywords :
Turbulence energy dissipation , Micromixing , Process intensification , Multifunctional heat exchanger/reactor , static mixer , Vortex Generators
Journal title :
Chemical Engineering and Processing: Process Intensification
Journal title :
Chemical Engineering and Processing: Process Intensification