An Experimental and Modeling Investigation on Drying of Ragi (<i>Eleusine corocana</i>) in Fluidized Bed

Srinivasakannan, C.; Balasubramaniam, N.

doi:10.1080/07373930601031588

Cited by 18 publications

(8 citation statements)

References 14 publications

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“…Different theoretical kinetic models for changes of moisture against time were presented for different materials by Hii et al (2009) and Srinivasakannan and Balasubramaniam (2006). Some of these models were applied to paddy drying by Das et al (2004Das et al ( , 2009).…”

Section: Drying Kineticsmentioning

confidence: 99%

Sequential modeling of fluidized bed paddy dryer

Bizmark

Mostoufi

Sotudeh‐Gharebagh

et al. 2010

Journal of Food Engineering

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Section: Drying Kineticsmentioning

confidence: 99%

Sequential modeling of fluidized bed paddy dryer

Bizmark

Mostoufi

Sotudeh‐Gharebagh

et al. 2010

Journal of Food Engineering

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“…Studies on drying were conducted by several authors using different variety of millets like Finger millet by Srinivasakannan and Balasubramaniam (), Pearl millet by Srinivasakannan and Balasubramanian (), Kodo millet by Yogendrasasidhar and Pydi Setty (), and so on, varying operating conditions in the fluidized bed dryer. The drying rates of materials have showed increment with increase of temperature and air velocity in literature reports.…”

Section: Resultsmentioning

confidence: 99%

“…In agricultural products, millet grains are important feed material for food processing units and beverage industries and also it is used as food material for different countries like Srilanka, India, Africa, and so on. Drying, exergy and exergy analyses have been carried out using different types of millets like Kodo millet (Yogendrasasidhar & Pydi Setty, ), Pearl millet (Srinivasakannan & Balasubramanian, ), and Finger millet (Srinivasakannan & Balasubramaniam, ). Barnyard millet is rich in iron and calcium and it contains high carbohydrate, protein, fat, and fiber nutrients.…”

Section: Introductionmentioning

confidence: 99%

Energetic and exergetic analyses of Barnyard millet drying using continuous multistage fluidized bed dryer

Devani

Yelamarthi

2019

J Food Process Engineering

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Most of the exergy studies reported were in batch fluidized bed drying process. The continuous dryer plays a pivotal role in industrial usage. In this study, exergy and energy analyses of multistage fluidized bed drying of Barnyard millet with stages connected externally were examined. The dryer was operated by changing wall temperature of stages (313–328 K), air inlet velocity (1.01–1.3 m/s), downcomer height (50–70 mm), and flow rate of solids (5–10 kg/h). Drying characteristics of Barnyard millet by changing process operating conditions of the dryer, were reported and the energy utilization ratio, exergy loss and exergy efficiency of dryer were also reported. The EUR of dryer at steady state has been found to be in the range of 0.25–0.46 and the maximum exergy efficiency of dryer was observed as 0.64 and lowest as 0.371 in the continuous drying process. Practical Applications Fluidized beds offer many distinct features and advantages for processing of particulate food materials. To decrease the drying time than that for single stage dryers, continuous multistage fluidized bed dryer was introduced. Reducing moisture content from feed materials in continuous dryers while discharging continuously, helps to process large quantity of solid materials with good quality of product. Several dryers with different modifications and designs have been suggested by many earlier investigators but continuous dryers play significant role in particulate industry. The multistage dryer is designed by connecting two or more fluidized beds internally or externally, where each bed is termed as a stage. Advantages of the multistage dryer are improvement in gas–solid axial mixing, which results in good quality of product. Due to stage‐wise contact of solids with gas, dried product with uniform moisture content can be obtained.

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“…These models have been successfully applied to describe the stationary‐ and fluidized‐bed drying of grains and fruits (Srinivasakannan and Balasubramaniam 2006; Thakur and Gupta 2006; Aktas and Polat 2007; Wang et al. 2007).…”

Section: Methodsmentioning

confidence: 99%

Effect of Airflow Reversal on Packed‐bed Drying of Carrots

Herman‐Lara

Martínez‐Sánchez

Amador-Mendoza

et al. 2010

J Food Process Engineering

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The effect of the periodical application of airflow reversals on drying rate has been investigated during the packed‐bed drying of carrots. Drying experiments were obtained from a complete 34 factorial design with air temperature (50, 70 and 90C), air velocity (2, 4 and 6 m/s), combined product thickness/bed height (0.001/0.05, 0.01/0.1 and 0.02/0.15 m/m) and frequency of application of the flow reversal (every 900 and 1800 s, and without reversals) as independent variables. Experimental data were fitted to the first‐order exponential model (FOEM) and the Page's model in order to estimate the drying rate constant. A normal quantile–quantile plot for the residuals demonstrated the inadequacy of the FOEM to describe satisfactorily the moisture evolution data. As expected, increasing air temperature and air velocity causes an increase on the drying rate, while a higher product and bed thickness causes the drying rate to decrease (P > 0.95). The effect of application of the airflow reversals was significant on the drying rate with resulting shorter drying times (P > 0.95). Furthermore, the drying rate was found to increase significantly with increase in the frequency of application of the airflow reversal (P > 0.995). PRACTICAL APPLICATIONS Considerable moisture and temperature gradients may develop during batch drying of deep beds due to air saturation, causing the quality loss of the product due to drying stresses and degradation of heat‐sensitive materials. The periodical reversion of airflow direction is a practical and economical way to avoid these phenomena. In this work, the influence of airflow reversal and several drying parameters on the overall drying rate is statistically determined during packed‐bed drying of carrots. Furthermore, the periodical reversion of airflow was demonstrated to reduce (up to 18%) the required time to achieve a given degree of drying, which may lead to decreases in energy consumption.

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An Experimental and Modeling Investigation on Drying of Ragi (Eleusine corocana) in Fluidized Bed

Cited by 18 publications

References 14 publications

Sequential modeling of fluidized bed paddy dryer

Sequential modeling of fluidized bed paddy dryer

Energetic and exergetic analyses of Barnyard millet drying using continuous multistage fluidized bed dryer

Effect of Airflow Reversal on Packed‐bed Drying of Carrots

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