Moisture diffusivity and shrinkage of broad beans during bulk drying in an inert medium fluidized bed dryer assisted by dielectric heating

Hashemi, G.; Mowla, Dariush; Kazemeini, Mohammad

doi:10.1016/j.jfoodeng.2008.12.004

Cited by 67 publications

(53 citation statements)

References 23 publications

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“…Fluidized bed drying is rapid and more uniform compared with fixed bed drying (Soponronnarit et al 1997). Fluidized bed drying was employed for drying of some agricultural grain products such as: broad beans (Hashemi et al 2009) (Souraki, Mowla 2007) and corn (Soponronnarit et al 1997).…”

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confidence: 99%

“…Effective moisture diffusivity is affected by air temperature and velocity (Senadeera et al 2000(Senadeera et al , 2003. All effective parameters on the mass transfer phenomenon in drying process are represented by effective moisture diffusivity (Hashemi et al 2009). Activation energy is important for estimation of minimum energy requirement for carrying out the drying process of garlic (Aghbashlo et al 2008).…”

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confidence: 99%

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Modeling some drying characteristics of garlic sheets under semi fluidized and fluidized bed conditions

Chayjan¹,

Salari²,

Shadidi³

2012

Res. Agric. Eng.

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Amiri Chayjan R., Salari K., Shadidi B., 2012. Modeling some drying characteristics of garlic sheets under semi fluidized and fluidized bed conditions. Res. Agr. Eng., 58: 73-82.Thin layer drying properties of high moisture garlic sheets under semi fluidized and fluidized bed conditions with high initial moisture content (about 154.26% d.b.) were studied. Air temperatures of 50, 60, 70 and 80°C were applied to garlic samples. Among the applied models, Page model was the best to predict the thin layer drying behavior of garlic sheets. Using this model, correlation coefficient (R 2 ) was high for all drying cases. The computed values of D eff were between 3.38 × 10 -10 and 2.54 × 10 -9 m 2 /s during the falling rate drying. Values of D eff for garlic sheets were also increased with increasing in input air temperature. Activation energy values were varied between 51.32 and 60.58 kJ/mol for 50 to 80°C, respectively. The specific energy consumption (SEC) for garlic specimens was placed in the range of 0.316 × 10 6 and 0.979 × 10 6 kJ/kg from 50 to 80°C, respectively. An increase in air temperature caused decrease in SEC value. Application of semi fluidized bed convective drying with temperature between 50 and 60°C was suitable to produce dried garlic.

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confidence: 99%

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confidence: 99%

Modeling some drying characteristics of garlic sheets under semi fluidized and fluidized bed conditions

Chayjan¹,

Salari²,

Shadidi³

2012

Res. Agric. Eng.

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“…Furthermore, fluidized bed drying prevents the hot spots formation and makes easy the control of process, especially for materials sensitive to temperature (Gazor 2009). Fluidized bed drying has been utilized for obtaining dried food and agricultural materials with high quality such as: corn (Soponronnarit et al 1997), broad beans (Hashemi et al 2009), milky mushroom (Arumuganathan (1) inverter, (2) fan and electrical motor, (3) thermostat, (4) electrical heater, (5) mixing chamber, (6) diffuser, (7) thermocouple (8) input air temperature recorder, (9) drying chamber, (10) air velocity sensor, (11) chamber cap, (12) outlet air temperature recorder, (13) computer et al 2009), rough rice (Amiri Chayjan et al 2009) and green beans (Souraki and Mowla 2007).…”

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confidence: 99%

“…Effective moisture diffusivity represents the effect of all input parameters on the mass transfer in drying process (Hashemi et al 2009). Minimum energy requirement for starting the drying process is known as activation energy (Aghbashlo et al 2008).…”

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Modeling moisture diffusivity, activation energy and specific energy consumption of squash seeds in a semi fluidized and fluidized bed drying

et al. 2011

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This study investigated thin layer drying of squash seeds under semi fluidized and fluidized bed conditions with initial moisture content about 83. 99% (d.b.). An experimental fluidized bed dryer was also used in this study. Air temperature levels of 50, 60, 70 and 80°C were applied in drying samples. To estimate the drying kinetic of squash seed, seven mathematical models were used to fit the experimental data of thin layer drying. Among the applied models, Two-term model has the best performance to estimate the thin layer drying behavior of the squash seeds. Fick's second law in diffusion was used to determine the effective moisture diffusivity of squash seeds. The range of calculated values of effective moisture diffusivity for drying experiments were between 0.160×10 −9 and 0.551×10 −10 m 2 /s. Moisture diffusivity values decreased as the input air temperature decreased. Activation energy values were found to be between 31.94 and 34.49 kJ/mol for 50°C to 80°C, respectively. The specific energy consumption for squash seeds was calculated at the boundary of 0.783×10 6 and 2.303×10 6 kJ/kg. Increasing in drying air temperature in different bed conditions led to decrease in specific energy value. Results showed that applying the semi fluidized bed condition is more effective for convective drying of squash seeds. The aforesaid drying characteristics are useful to select the best operational point of fluidized bed dryer and to precise design of system.

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“…Volume shrinkage in bio-materials depends of moisture content [9]. Heating and loss of water causes stresses in the bio-material cell structure, changes in shape and a decrease in dimensions [10,11]. Tissue changes usually associated with dehydration are shrunken, shriveled, darkened materials of poor rehydration ability after drying [12].…”

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confidence: 99%

Drying kinetics and shrinkage analysis of Valeriana officinalis roots

Zlatanović¹,

Pajic²,

Rančić³

et al. 2017

FME Transactions

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Moisture diffusivity and shrinkage of broad beans during bulk drying in an inert medium fluidized bed dryer assisted by dielectric heating

Cited by 67 publications

References 23 publications

Modeling some drying characteristics of garlic sheets under semi fluidized and fluidized bed conditions

Modeling some drying characteristics of garlic sheets under semi fluidized and fluidized bed conditions

Modeling moisture diffusivity, activation energy and specific energy consumption of squash seeds in a semi fluidized and fluidized bed drying

Drying kinetics and shrinkage analysis of Valeriana officinalis roots

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