Numerical investigation of intermittent drying of a corn for different drying conditions

Abstract

In this study, intermittent drying process of corn was studied numerically for various intermittent periods and drying air temperatures. An Arrhenius type diffusicoefficient D = e (-b/T) ⋅ 10-9 m 2 /s was proposed for the moisture diffusion inside the corn. Numerical simulations were performed by choosing the suitable value for drying constant, b, that yields the best agreement with experimental drying rates. The experimental results were obtained via an experimental setup for intermittent periods of 30 minute and 60 minute, and drying air temperatures of 40 °C, 50 °C, 60 °C, and 70 °C. The results show that overall agreement between the experimental and theoretical prediction is good. On the other hand, the theoretical results overestimate the moisture ratio at the initial stage and underestimate it at the later stage of drying.

Study of heat and mass transfer control inside channel partially filled with a porous medium using nanofluids

“…The average density of this phase is not constant; the mass conservation equation of the gas phase is given by: (6)  Vapour phase (7) o The average velocities of the nanofluid phase and the gas phase are obtained using Darcy's law:  Nanofluid phase (8) -Gas phase (9) o Energy conservation equation (10) is the latent heat of vaporization at temperature T (K):…”

“…Fluid flow and heat transfer in porous media has been the subject of several investigations in the recent years [1][2][3][4][5] due to its wide applications in engineering fields such as heat exchangers, geothermal energy, oil recovery, solar collectors, building construction and especially drying processes [6][7]. Consequently, the high-energy consumption during drying of porous solids has made it a subject of scientific and technological interest in a great number of industrial applications, including food, wood [8], paper, textile, ceramics, building materials, steel Balls [9] and brick which is the subject of our study.…”

Modeling of intermittent convective drying of walnuts in single layer and its influence on deep bed drying simulation

“…During the continuous convection drying, at some point concentration of moisture at the surface becomes too low, and the process efficiency decreases [10]. A process of dehydration where the tempering periods are inserted and the moisture content profile relaxation is allowed in those periods, is usually referred to as an intermittent drying process.…”