Journal ArticleDOI
Particle Residence Time Distributions in Two-phase Flow in Straight Round Conduit
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TLDR
In this paper, the authors studied the effect of particle-to-fluid density ratios on the particle residence time followed a quadratic function where particles with density ratio of 1.01 had the least residence time and velocities of the fastest moving particles were all about 1.25 times the mean fluid velocity in the turbulent flow regime.Abstract:
Residence times were studied for single particles (polystyrene spheres 19.1 mm diam) in the straight portion of the holding section of a continuous flow system. Particle residence times were all less than the mean residence time of fluid; their ranges were within particle-to-fluid residence time ratios of 0.8 to 1.0. The velocities of the fastest moving particles were all about 1.25 times the mean fluid velocity in the turbulent flow regime. Particle density was important in the flow patterns of two-phase flow. The effect of particle-to-fluid density ratios on the particle residence time followed a quadratic function where particles with density ratio of 1.01 had the least residence time.read more
Citations
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Residence time distribution (RTD) in aseptic processing of particulate foods: A review
TL;DR: In this paper, residence time distribution (RTD) of food particles in aseptic processing systems and the different experimental techniques used to gather RTD data as well as mathematical models used to describe RTD curves are discussed.
Journal ArticleDOI
The Fluid Mechanics of Two-Phase Solid-Liquid Food Flows: A Review
TL;DR: In this article, a comprehensive review of the existing knowledge on the fluid mechanics of two phase solid-liquid flows which largely emanates from the process engineering literature, and discusses its exploitation in continuous food processing is presented.
Journal ArticleDOI
Particle velocity profiles for solid-liquid food flows in vertical pipes part I. Single particles
TL;DR: In this paper, the authors used an optical technique to identify particle velocity profiles in a vertical tube 44 mm in diameter, and demonstrated that radial particle migration is significant in vertical flows of up to 10% particle concentration.
Journal ArticleDOI
Concentric flow regime of solid-liquid food suspensions: theory and experiment
TL;DR: In this paper, a Positron Emission Particle Tracking (PEPT) technique was used to determine the trajectories of almost neutrally-buoyant 5-10 mm alginate spheres in viscous non-Newtonian solutions.
Journal ArticleDOI
Residence time distribution of food and simulated particles in a holding tube
TL;DR: In this paper, the authors determined the residence time distribution of tracer tracer particles in a holding tube, as affected by particle shape (cube, cylinder, sphere), particle concentration (10, 20, and 30% w/v), particle type (potato, carrot, turkey, green peas, and polystyrene), fluid viscosity (0.0% CMC, 0.5%, 0.28, and 8.28%), and SSHE shaft speed (30, 60, and 90 rpm).
References
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Journal ArticleDOI
The transverse force on a spinning sphere moving in a viscous fluid
S. I. Rubinow,Joseph B. Keller +1 more
TL;DR: In this article, the Stokes and Oseen expansions of the Oseen equation are used to calculate the transverse force of a spinning sphere in a viscous fluid, which is in such a direction as to account for the curving of a pitched baseball, the long range of a flying golf ball, etc.
Journal ArticleDOI
Particle motion in laminar vertical tube flow
R. C. Jeffrey,J. R. A. Pearson +1 more
TL;DR: In this article, the motion of small rigid spherical particles suspended in a Newtonian viscous liquid flowing under steady laminar conditions in a vertical tube of circular cross-section was studied.
Journal ArticleDOI
Influence of Particle Rotation on Radial Migration in the Poiseuille Flow of Suspensions
TL;DR: Segre and Silberberg as mentioned in this paper observed that the inward motion of the spheres resulted from a force, akin to the Magnus effect, which was present because the spheres rotated as they passed through the tube.
Journal ArticleDOI
Mathematical evaluation of process schedules for aseptic processing of low-acid foods containing discrete particulates.
TL;DR: In this paper, a quantitative methodology was developed for evaluating thermal process schedules for low acid foods containing particulates of any shape, using finite element analysis to determine temperature distributions within particulate foods subjected to timevarying boundary conditions.
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