Mathematical Modeling of Thin-Layer Drying of Longan in Hot Air Tunnel
Keywords:
Semi-theoretical mathematical model, Thin layer dryingAbstract
The objectives of this research is to kinematics study of thin layer drying of longan in hot air dryer tunnel. The drying of longan were conducted under three drying temperature of 55, 65, and 75°C with average layer thickness 15 mm with air velocity 1.0 ms-1. Twelve semi-theoretical drying model were investigated and model parameter were determined by non-linear analysis whereas R2, X2, RMSE, and sum of residuals values are used to confirm goodness of fit in models. According to explore, the Midilli’s model is the best fit of Longan drying via varying drying temperature. By following Fick’s diffusion equation, the effective moisture diffusivity (Deff) of longan drying is in the range 9.47´10-10-20.00´10-10 m2s-1 correlating with drying temperature from 55°C to 75°C. By graphical analysis, the activation energy of diffusion (Ea ) of Longan is 35.60 kJ/mol and the predicted moisture ratio agreed well with experimental values.
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