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Modelling non‐Newtonian two‐phase flow in conventional and helical‐holding tubes
Author(s) -
Sandeep K. P.,
Zuritz Carlos A.,
Puri Virendra M.
Publication year - 2000
Publication title -
international journal of food science and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.831
H-Index - 96
eISSN - 1365-2621
pISSN - 0950-5423
DOI - 10.1046/j.1365-2621.2000.00408.x
Subject(s) - mechanics , residence time (fluid dynamics) , residence time distribution , flow (mathematics) , volumetric flow rate , tube (container) , laminar flow , fluid dynamics , newtonian fluid , non newtonian fluid , heat transfer , particle (ecology) , materials science , simulation , physics , engineering , composite material , geology , geotechnical engineering , oceanography
Summary The research described in this communication was undertaken to test the hypothesis that the fluid mechanics and heat‐transfer aspects involved in aseptic processing could be modelled. In order to do this, a finite difference FORTRAN program (using the fourth‐order, four‐stage explicit Runge–Kutta method) was written by the authors to compute the velocity of fluid elements and particles during fully 3‐dimensional flow in conventional and helical‐holding tubes. The effect of particles on the fluid‐flow field and the interaction between particles was taken into account during the modelling. Simulation results showed that an increase in specific gravity, tube diameter or coil diameter resulted in an increase in the residence time of the particles, while an increase in the flow rate decreased the residence time of the particles. An increase in the particle diameter or the flow rate narrowed the Residence Time Distribution (RTD) of the particles, while an increase in specific gravity or the tube diameter increased the RTD of the particles.