Simultaneous heat and mass transfer between air and soybean seeds in a concurrent moving bed

Abstract

Summary The aim of this work was to study the simultaneous heat and mass transfer between air and soybean seeds in concurrent moving bed dryers. The stationary behaviour of the process was described by the mass and energy equations applied to both fluid and particulate phases, assuming uniform velocity of the seeds and flat velocity profile of the air. The results of the fluid‐dynamic study confirmed that the velocity of the seeds and air inlet profiles were essentially uniform. The experimental data and simulated values of the temperature of the fluid and temperature and moisture of the seeds were in good agreement.

Drying kinetics, structural characteristics and vitamin C retention of dedo-de-moça pepper (Capsicum baccatum) during convective and freeze drying

“…Hence, experimental studies and application of simplified models to represent the drying behavior are still required (Barrozo et al, 2001). A number of empirical and semi-empirical equations have been proposed in the literature (Lewis, 1921;Brooker et al, 1974;Henderson and Henderson, 1968;Page, 1949;Overhults et al 1973, among others) to describe the drying kinetics of biological materials.…”

Modelling of fertilizer drying in a rotary dryer: parametric sensitivity analysis

“…Modelling of the drying process in moving bed dryers is based on applying the equations of conservation of mass and energy to the fluid and particulate phases in infinitesimal volume elements of the dryer (Barrozo et al, 2001). Figure 2 shows the scheme of the infinitesimal volume element of a conventional rotary dryer operating in countercurrent flow (Arruda, 2008).…”

Concurrent drying of soybean seeds: the effect of the radial air profile

“…To describe heat and mass transfer between air and soybean seeds in moving bed dryers, the twophase mathematical model was developed based on the following assumptions (Barrozo, 1995;Barrozo, Murata and Costa, 1998):…”

“…In recent years, research on the moving bed technique, specially on its application in agricultural dryers, has intensified (Barrozo, 1995;Barrozo, Murata and Costa, 1998). This technique requires a lower investment and a lower consumption of energy and causes less mechanical damage to the seeds than other techniques.…”

“…The so-called two-phase model (Barrozo, 1995;Barrozo, Murata and Costa, 1998) is used to describe heat and mass transfer between air and soybean seeds in the moving bed dryer. This model comprises the mass and energy balance equations applied to both fluid and solid phases and requires constitutive equations for the coefficient of heat transfer between these two phases, the drying kinetics and the equilibrium moisture content of the solid material.…”