Impact of the Instant Controlled Pressure Drop Treatment on Hot Air Drying of Cork Granules

Abdulla, Galal; Belghit, Abdelhamid; Allaf, Karim

doi:10.1080/07373930903523829

Cited by 9 publications

(4 citation statements)

References 17 publications

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“…The major advantages of these technique are a reduction in drying time and highly porous dried products with no shrinkage. These techniques of instantaneous and cyclic pressure drop have been successfully applied to the industrial drying of various food products including grains, fruits, medicinal herbs, vegetables, and fish (Maache-Rezzoug et al 2002;Cong et al 2008;Abdulla et al 2009;Abdulla et al 2010). This process has been in commercial use since 1993, mainly in France.…”

Section: Variable Pressure Drop Dryingmentioning

confidence: 99%

Recent Developments in Drying Technologies for Foods

Jangam

Mujumdar

2013

Food Engineering Series

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Section: Variable Pressure Drop Dryingmentioning

confidence: 99%

Recent Developments in Drying Technologies for Foods

Jangam

Mujumdar

2013

Food Engineering Series

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“…A final conventional hydrodistillation followed this operation. DIC reactor was defined and presented in various papers [4,5]. It consists of three main parts: a processing vessel for the vacuum and saturated dry steam pressure (usually up to 1 MPa) stages, a large vacuum tank (120 times the treatment vessel volume), and a vacuum pump of 5 ± 0.1 kPa.…”

Section: Description and Principle Of Dicmentioning

confidence: 99%

Starting-Accessibility / Water Internal Diffusion (SAWID) Phenomenological Model of Myrtle Drying Kinetics

Berrich,

Allaf,

Azzouz

et al. 2023

Preprint

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To avoid empirical modeling and embrace a relevant phenomenological analysis, the present work deals with the conditions allowing to adopt the transfer by internal water diffusion as the limiting process of the whole drying. Verification of the Negligible External Resistance NER criterion has been conducted and the main part of the drying kinetics allows expressing the effective diffusivity Deff of water within the porous material. Moreover, the kinetic experimental data of both the initial and final stages must be excluded. The first one concerns the surface interaction while the last paradoxical stage reveals the vapor transfer within the porous medium. Instant Controlled Pressure-Drop DIC pretreatment was adopted in the drying of myrtle leaves and fruits. An instant pressure drop towards a vacuum occurs after a saturated steam pressure P ranged between 100 and 500 kPa for a short processing time tof20/60s and 10/30 s for myrtle leaves and fruits, respectively. Afterward, the drying experiments were carried out with a constant airflow of 50°C and 2.5 m/s. The phenomenological modeling of drying kinetics was dedicated to well analyzing the impact of DIC operating parameters on the physical and statistical analyses.

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“…By texturing by Instant controlled pressure drop DIC, raw materials (plants, medicinal herbs) could get higher porosity. Dehydration by successive decompression (DDS; de shydratation par de tentes successives) is a process particularly suited to thermo-sensitive products, in which the product undergoes a series of cycles, during which it is placed under pressure (<10 bar) for a defined time and is then subjected to an instantaneous decompression to a vacuum (5-90 kPa) [63][64][65][66][67][68] The product is maintained under a vacuum for a defined time before the following cycle begins. Each decompression step results in partial water removal by autovaporization.…”

Section: Variable Pressure Drop (Instantaneous/cyclic) Methodsmentioning

confidence: 99%

“…A variation of operating pressure by controlled instantaneous means or in cyclic way can be used to achieve high quality of dried products 63,64) . In a controlled instanta-neous pressure drop (commonly referred to as DIC) method, the product is subjected to vacuum in a processing chamber and then exposed to steam pressure followed by an instantaneous drop in pressure toward a vacuum and finally a return to atmospheric pressure 65,66) . By texturing by Instant controlled pressure drop DIC, raw materials (plants, medicinal herbs) could get higher porosity.…”

Section: Variable Pressure Drop (Instantaneous/cyclic) Methodsmentioning

confidence: 99%