Abstract
Hot air drying of ginger (Zingiber Officinale) samples (10 mm × 10 mm × 5 mm) having an initial moisture content of 84.89% (wet basis) were carried out at 60℃. Effect of treatment prior to drying was studied at different concentrations of calcium chloride (CaCl2) of 3, 3.5, 4, and 4.5 Mol per liter and compared with the samples dried without pretreatment. Also, process intermittency was applied with a pulse ratio of 1.5 by keeping the sample in vacuum or open atmosphere. During intermittent drying, the products were dried in hot air dryer for 40 min, followed by either vacuum drying or open-air drying at ambient conditions for 20 min. It was observed that calcium chloride with higher concentrations had a significant effect on the moisture extraction rate. Open-air intermittency exhibited better rehydration ability and lowest shrinkage ratio, which facilitated a higher drying rate during the falling rate period.
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Abbreviations
- \(m_{d}\) :
-
mass of dried sample (kg)
- \(m_{r}\) :
-
mass of rehydrated sample (kg)
- RH:
-
relative humidity (%)
- \(V_{d}\) :
-
volume of sample after drying (m3)
- \(V_{f}\) :
-
volume of sample before drying (m3)
- w/v:
-
weight per volume
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Majumder, P., Sinha, A., Gupta, R., Mishra, L. (2022). Hot Air Drying Characteristics and Quality Analysis of Ginger (Zingiber Officinale): Effect of Pretreatment and Process Intermittency. In: Palanisamy, M., Natarajan, S.K., Jayaraj, S., Sivalingam, M. (eds) Innovations in Energy, Power and Thermal Engineering . Lecture Notes in Mechanical Engineering. Springer, Singapore. https://doi.org/10.1007/978-981-16-4489-4_19
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