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Dimensionless analysis of fluid-to-particle heat transfer coefficients
Baptista, Paulo N.; Oliveira, Fernanda A.R.; Oliveira, Jorge C.; Sastry, Sudhir K.Average fluid-to-particle heat transfer coefficients were experimentally determined for spherical aluminium particles heated in car☐ymethylcellulose solutions. Two situations were considered: a still panicle immersed in a moving fluid, and a particle rotating in an otherwise stagnant fluid. Fluid flow rate, rotating particle velocity, particle diameter and fluid rheological properties were varied, covering a la...
Dimensionless analysis of the flow of spherical particles in two-phase flow in ...
Baptista, Paulo N.; Oliveira, Fernanda A.R.; Oliveira, Jorge C.; Sastry, SudhirIn the aseptic processing of particulate fluid foods, the residence time distribution of particles and the fluid-to-particle heat transfer are intimately related to the linear and rotational velocities of the particles. The development of models correlating these velocities with fluid and particle characteristics and with operating conditions is therefore very useful, as it provides a fast method to estimate fl...
Effect of product and process variables in the flow of spherical particles in a...
Baptista, Paulo N.; Oliveira, Fernanda A. R.; Caldas, Susana M.; Oliveira, Jorge C.; Sastry, Sudhir K.Residence time of particles and fluid-to-particle heat transfer coefficient, two of the major unknowns in the aseptic processing of particulate fluid foods, are intimately related with the linear and rotational velocities of the solid particles. These two velocities were measured by videotaping the flow of individual spherical particles in transparent straight tubes. The effect of fluid velocity and viscosity, ...
Influence of large solid spherical particles on the residence time distribution...
Baptista, Paulo N.; Oliveira, Fernanda A. R.; Cunha, Luís M.; Oliveira, Jorge C.The effect of large solid particles on the residence time distribution of the fluid in two-phase flow was studied in a pilot scale continuous tubular system. The residence time distribution was characterized with four parameters: the normalized minimum and mean residence time, the normalized standard deviation and the skewness. The effect of particle concentration (1 and 3%) and particle diameter (diameters app...
Optimum feed- and tank-operating conditions to maintain constant particle conce...
Baptista, Paulo N.; Oliveira, Fernanda A.R; Oliveira, Jorge C.Ensuring product safety and constant quality in aseptic processing of particulate fluid foods can be a problem if feed particle concentration varies with time. the variability of particle concentration distributions from a vertical stirred feed tank was measured as standard deviations of mean particle concentrations at the tank outlet and as differences between this concentration and the bulk concentration in t...
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