In this work, internal moisture profiles obtained either by simulation or experimentally during the convective drying of resorcinol-formaldehyde gels are compared. Such a comparison constitutes an attractive way to validate drying simulation models. X-ray microtomography, a powerful 3D imaging technique, coupled to image analysis is used to determine the internal moisture profiles in a non dest...

Pulsed electric field (PEF) pretreatments and ultrasound (US) application are techniques previously used to enhance the drying operation, not only increasing kinetics but improving product quality. Because PEF could affect structure US influence depends on internal of products, combination both have a synergistic effect. Thus, combined pulsed during color, total phenolic content, ascorbic acid ...

drying characteristics of green pea (pisum satium) with an initial moisture content of 76% (db) was studied in a fluidized bed dryer assisted by microwave heating. four drying air temperatures (30, 40, 50 and 60ºc) and five microwave powers (180, 360, 540, 720 and 900w) were adopted. several experiments were conducted to obtain data for sample moisture content versus drying time. the results sh...

The use of ultrasound is a new method to enhance convection drying. However, there little information in the literature on improvement convective heat transfer caused by ultrasound. Therefore, transport during ultrasound-assisted heating small samples hybrid dryer was experimentally examined. A Biot number regime considered. results confirmed great enhancement due application Due ultrasound, ex...

The newly developed Heat Exchanger Evacuated Tube Assisted Drying System (HE-ETADS) is fabricated in roof of campus MITS, Gwalior, India. transfer analysis drying system carried out by mushroom inside it. heat coefficient plays a significant role method. study emphasizes on determining the convective as well evaporative coefficients (CHTC & EHTC) and determination best rate model fit fo...

The dehydration tests were conducted at three drying methods to evaluate the drying curves and the energy uptake. Apple (Malus domestica L.) cubes were dried under different processing conditions applying freeze drying (FD), freeze drying assisted by hot air and freeze drying assisted by infrared radiation. Control samples were produced using regular freeze drying without the pre-drying. Hot ai...

The disposal of Waste Activated Sludge is a major problem. The paper presents several disposal routes. The ultimate steps in these routes are indirect drying and subsequent incineration. Although the design of the indirect dryers is straightforward from a required heat input, operating temperature difference between sludge bed and heating medium and the heat transfer coefficient, this coefficie...

orange (citrus cinensis) is one of the most important among citrus fruits. the thin layer drying kinetics of orange (thompson variety) slice was here experimentally investigated in a convective dryer and through mathematical modeling and by use of thin layer drying models. drying characteristics of oranges were determined using heated ambient air at temperatures from 40 to 80 °c and velocities ...