Residence time distribution of food suspensions containing large particles when flowing in tubular systems

Determination of food particle residence time distributions in coiled tube and straight tube with bends at high temperature using correlation analysis

“…The influence of particle concentration on particle MNRT in tube flow has been reported in the literature (Abdelrahim et al, 1997;Alhamdan & Sastry, 1997;Palmieri et al, 1992;Salengke & Sastry, 1996;Sandeep & Zuritz, 1991). Sandeep and Zuritz (1991) found an increasing trend of the particle MNRT in a straight tube as the particle concentration increased for the particle concentration range of 1-5%.…”

“…Sandeep and Zuritz (1991) found an increasing trend of the particle MNRT in a straight tube as the particle concentration increased for the particle concentration range of 1-5%. At a higher level of particle concentration (10-30%), Palmieri et al (1992) and Alhamdan and Sastry (1997) found that the MNRT decreased with an increase in particle concentration. In this study, the effect of particle concentration was found insignificant (P = 0.0585) at 95% confidence level.…”

“…The decrease in SNRT as the particle concentration increased could be the indication of the increase in the particle-particle interaction. It has been reported by Palmieri et al (1992) that the collisions among particles result in the acceleration of the overall motion of the particles and thus provide a lower discrepancy in the residence time between the fastest and the slowest particles. A more notable decrease in the SNRT with particle concentration in the coiled tube could be an implication that there were more particle-particle interactions in the coiled tube than in the straight tube.…”

“…Many residence time distribution studies have been carried out in straight hold tubes (Baptista, Oliveira, Caldas, Oliveira, & Sastry, 1996;Dutta & Sastry, 1990;McCoy, Zuritz, & Sastry, 1987;Palmieri, Cacace, Dipollina, DallÕAglio, & Masi, 1992;Richardson & Gaze, 1986;Yang & Swartzel, 1991). However, only a few studies have been reported on the residence time distribution of food suspensions in curved tubes.…”

Characterization of solid–liquid suspensions (real, large non-spherical particles in non-Newtonian carrier fluid) flowing in horizontal and vertical pipes

“…The expected advantages of a continuous process are an increase in production capacity, a reduction in power consumption, an improved treatment homogeneity and a conservation of the integrity of particles. However, microbial safety and nutritional quality of liquid-solid mixtures being functions of time and temperature in the aseptic processing system, Residence Time Distribution (RTD) and heat transfer studies have been carried out by many authors (Aströ m & Bark, 1994;Chandarana, 1992;Dutta & Sastry, 1990a, 1990bEliot-Godereaux, Fairhurst, Goullieux, & Pain, 2001;Fairhust & Pain, 1999;Palmieri, Cacae, Dipollian, & DallÕaglio, 1992;Sastry, 1992Sastry, , 1993Zaboubi, 1995) using real food particles such as carrots or potato cubes or model particles often made of alginate. In continuous process, hydraulic and thermal phenomena will be closely associated.…”