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2015 | 36 | 3 | 277-289
Article title

Secondary flows occurring in a whirlpool separator – A study of phenomena – observation, simulation and measurements

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The whirlpool separator, used for hot trub separation, is prevalent in the brewing industry. It is a kind of a hydrocyclone inside of which a tea leaf effect occurs, which is sediment accumulation into a cone shape at the central part of the tank’s bottom. This manner of sediment accumulation is caused by the secondary flow occurring in the so-called Ekman boundary layer. This article is a summary of the research, which has been conducted for many years and involved observation, simulation and experimental research on the recognition and formation of the secondary flow accumulating the sediment cone. Secondary flows occurring in a whirlpool were identified through CFD simulation and PIV experiments, and are presented in this paper. Based on their location and direction, an attempt to determine their impact on the separation process taking place in the whirlpool has been made. The secondary flow identification methods proposed in this paper can be successfully applied in other solutions, e. g. structural ones, which involve rotational-flow-based separation.
whirlpool   CFD   PIV  

Physical description
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  • Koszalin University of Technology, Faculty of Mechanical Engineering, Department of Food Industry Processes and Facilities, Raclawicka 15-17,75-620 Koszalin, Poland,
  • Arifin D.R, Yeo L.Y., Friend J.R., 2007. Microfluidic blood plasma separation via bulk electrohydrodynamic flows. Biomicrofluidics, 1, 014103. DOI: 10.1063/1.2409629.
  • Denk V., Dürholt A., 1991. Experimental investigations of the unsteady rotating flow field in a cylindrical vessel. Exp. Fluids, 12, 97-105. DOI: 10.1007/BF00226572.
  • Diakun J., Jakubowski M., 2010. Analysis of the secondary flow velocities forming a settling cone in a whirlpool vat. Chem. Process Eng., 31, 477-488.
  • Diakun J., Jakubowski M., 2013. Dimensionless numbers of structural and process similitude of a whirlpool hot trub separator. J. Food Process Eng., 36, 748-752. DOI: 10.1111/jfpe.12043.
  • Duarte A.P.E., Cristianini M., 2012. Using Computational Fluid Dynamics (CFD) for evaluation of fluid flow through a gate valve. Int. J. Food Eng., 8. DOI: 10.1515/1556-3758.2207.
  • Dürholt A., 1988. Experimental investigation of the unsteady rotational flow in the settling vessel “whirlpool”. Fortschr.-Ber. VDI 14(38), 24-28. VDI-Verlag Düsseldorf (in German).
  • Einstein A., 1926. The cause of the formation of meanders in the courses of rivers and of the so-called Baer’s law. Naturwissenschaft, 14, 2, 223-224 (in German).
  • Geiger H., 1937. Sand Trap. US Patent 2088294.
  • Kunze W. Technology brewing and malting. 2014, VLB, Berlin, 356-360.
  • Jakubowski M., Diakun J., 2007. Simulation investigations of the effects of whirlpool dimensional ratios on the state of secondary whirls. J. Food Eng., 1, 107-110. DOI: 10.1016/j.jfoodeng.2006.12.025.
  • Jakubowski M., 2011. Three-dimensional model of fluid flow in the whirlpool, Technol. Progress Food Process., 1, 24-28 (in Polish).
  • Jakubowski M., Sterczyńska M., Matysko R., Poreda A., 2014. Simulation and experimental research on the flow inside a whirlpool separator. J. Food Eng., 133, 9-15. DOI: 10.1016/j.jfoodeng.2014.02.011.
  • Jakubowski M., Wyczalkowski W., Poreda A., 2015. Flow in a symmetrically filled whirlpool: CFD modelling and experimental study based on Particle Image Velocimetry (PIV). J. Food Eng., 145, 64-72. DOI: 10.1016/j. jfoodeng.2014.08.009.
  • Sterczyńska M., Jakubowski M., Tuszyński T., 2014. The swirling vat used particularly in brewing process and method of filling it. National Patent Application; P.407021 (in Polish).
  • Škerlavaj A., Škerget L., Ravnik J., Lipej A., 2014. Predicting free-surface vortices with single-phase simulations. Eng. Appl. Comp. Fluid Mech., 8, 193-210. DOI: 10.1080/19942060.2014.11015507.
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