Mathematical Modeling and Hysteresis of Sorption Isotherms for Paddy Rice Grains

Experimental Investigation of Moisture Sorption Isotherms for Mefenamic Acid Tablets

“…According to [12] the large hysteresis is associated with tightly bound water and the large magnitude of hysteresis loops is due to the difference in the distribution of pore size. [15] explained this phenomenon occurrence by capillary condensation theory: the material porous is formed by narrow capillaries of small diameters, they control capillary emptying during desorption process, causing the relative humidity reduction, while during adsorption process, moisture gained, capillaries were not filled as before desorption, lead to a lower value of moisture content as before.…”

“…The isotherm curves were of type II according to Brunauer`s classification, they had the S-shape, sigmoidal, this shape is common for hygroscopic products, and indicated the formation of a well-defined monolayer [13,14]. It is caused by synergistic effects of the capillarity, Raoult's law, and moisture interactions at the surface of the material [15]. There was a slight increase in EMC at a low and intermediate range of a w .…”

“…The standard error of estimate (SEE), Eq. 4, the model´s ability to describe a certain physical process has an inverse proportional to SEE, low values of SEE indicate a good fit of the model to the data [15,23,24].…”

“…During desorption, the pores were saturated at the beginning then water diffusion occurred from the periphery to the surface and that when the partial pressure of the water vapor in the surrounding air became lower than the vapor pressure inside the capillary. The value of hysteresis is the difference of equilibrium moisture content between desorption and adsorption [14,15,16].…”

Wireless sensors for quality monitoring and management of stored grain inventories

“…In general, the average calculated EMC values during the step-down temperature change were slightly higher compared to during the step-up temperature change. The reasons for this observation are likely related to the hysteresis effect which is well documented for the difference in the EMC relationship during the moisture loss versus moisture gain phases at the same temperature (Zeymer et al, 2019;Santalla & Mascheroni, 2003). The ASABE Standard EMC equations generally apply for the drying condition and do not capture the rewetting condition (ASAE Standards, 2001).…”