Moisture Diffusion and Desorption Isotherms for Banana

Abstract

The desorption isotherms for whole peeled banana, convection dried in warm air, have been measured and fitted by the Modified-Oswin and Modified-Chung-Pfost equations. The equations agreed with the water activity observed in commercial sun-dried banana packs from Thailand. The convective drying curves for peeled banana were determined and fitted by the Newton (exponential) and Diffusion models. The Newton model was found more effective, probably due to a surface resistance that develops during drying. The drying constant, K in the Newton model, was fitted to banana temperature by the Arrhenius equation. Moisture diffusivity results agreed with previous work, including the activation energy in the Arrhenius equation.

Moisture sorption isotherms for mungbean (Vigna radiata L)

“…Therefore, it could be concluded that a single model is not sufficient to describe the adsorption behaviour in terms of both M = f(rh, T) and rh = f(M, T). These types of fitting results were also reported by Sun and Woods (1994) and Phoungchandang and Woods (2000).…”

Integrated approach on solar drying, pilot convective drying and microstructural changes

“…The Arrhenius law is often used to describe the relationship (Madamba et al, 1996;Mazza & Le Maguer, 1980;Mulet et al, 1989;Newman, Price, & Woolf, 1996;Phoungchandang & Woods, 2000a;Yusheng & Poulsen, 1988), sometimes expressed in terms of a finite reference temperature, T ref :…”

Microwave blanching and drying characteristics of Centella asiatica (L.) urban leaves using tray and heat pump-assisted dehumidified drying

“…Interestingly, the "Zero model" used the simplified form of moisture ratio as X/X 0 instead of (X-X e )/(X 0 -X e ) by taking the equilibrium moisture content (X e )00 in Eq. (13) (Phoungchandang and Woods 2000). The R 2 for the model were rather high (more than 0.957) with low SEE (lower than 0.081 % d.b.…”

“…Fresh and blanched C. asiatica leaves were placed on a preweighted drying tray in order to proceed to the thin-layer drying process using a tray dryer (Armfield Limited, Hampshire, England) at 50°C to obtain seven different levels of moisture content (Phoungchandang and Woods 2000). The dried leaves of 0.5 g were measured for equilibrium relative humidity at 20, 35 and 50°C, respectively, by using Aqualab (Series 3TE, Devices, America) that is specially designed for temperature -controlled dew point of water activity or relative humidity at equilibrium state with an accuracy of 0.01 %.…”