Journal of Food, Agriculture and Environment

Vol 9, Issue 2,2011
Online ISSN: 1459-0263
Print ISSN: 1459-0255

Drying paddy by microwave vibro-fluidized bed drying using single mode applicator


Rittichai Assawarachan 1*, Jiraporn Sripinyowanich 2, Kriangsak Theppadungporn 3, Athapol Noomhorm 2

Recieved Date: 2010-11-21, Accepted Date: 2011-04-03


This study aimed to develop the system of microwave-assisted vibro-fluidized bed (MVFB) drying for particulate agricultural products by applying the single mode applicator (SMA), where the microwave field can be focused. SMA- and multi-mode applicator (MMA)-MVFB dryers were set up and their microwave efficiency at different levels of microwave power density (0.82, 1.04 and 1.70 kW/kg) was investigated in water system. Types of applicator did not affect microwave generation efficiency but significantly affected microwave absorbance efficiency. Almost 100% efficiency of microwave absorbance was achieved when heating water in SMA. Therefore, SMA-MVFB drying was selected to perform drying characteristics of paddy, the representative of particulate agricultural products. Four drying techniques including MVFB drying at 850 W, low temperature (LT)- MVFB drying at 850 W and 60ºC, LT-vibro-fluidized bed (VFB) drying at 60ºC and high temperature (HT)-VFB drying at 150ºC were used to dry paddy from 27 to 17% w.b. under constant air velocity of 5 m/s and vibration of 1200 rpm. In addition, it consumed the lowest energy and removed the highest amount of water from paddy. The hybrid system of LT-MVFB drying was proven to be superior to the other drying techniques. This study confirmed successfully application of SMA-MVFB drying for paddy.


Microwave drying, vibro-fluidized bed drying, single mode applicator, paddy drying

Journal: Journal of Food, Agriculture and Environment
Year: 2011
Volume: 9
Issue: 2
Category: Food and Health
Pages: 50-54

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