The drying kinetics of kale (Brassica oleracea) in a convective hot air dryer

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dc.contributor.authorGikuru, Mwithiga
dc.contributor.authorOlwal, Joseph Ochieng
dc.date.accessioned2015-07-09T07:02:43Z
dc.date.available2015-07-09T07:02:43Z
dc.date.issued2005-12-31
dc.description.abstractThe effect of air temperature and sample thickness on the drying kinetics of kale was investigated using a convective air dryer at a fixed airflow rate of 1 m/s and drying air temperatures of 30, 40, 50 and 60 °C. The sliced kale leaves were dried in wire trays in 10, 20, 40 and 50 mm thick layers. The drying rate increased with drying air temperature but decreased with layer thickness. The effective diffusivity for 10 mm thick layers was found to increase with the drying air temperature and ranged between 14.9 and 55.9 × 10−10 m2/s. The effect of temperature on diffusivity could be expressed by an Arrhenius type relationship with a high R2 of 0.9989. The activation energy of kale was found to be 36.115 kJ/mol. When four drying models were developed using the experimental data the Modified Page model was found to be marginally better than the other models in estimating the drying curve over the experimental temperature range.en_US
dc.identifier.citationJournal of Food engineering Vol.71 (4) pp.373-378en_US
dc.identifier.urihttp://hdl.handle.net/123456789/153
dc.language.isoenen_US
dc.publisherElsevieren_US
dc.subjectKaleen_US
dc.subjectDrying timeen_US
dc.subjectModelingen_US
dc.subjectDiffusivityen_US
dc.subjectActivation energyen_US
dc.titleThe drying kinetics of kale (Brassica oleracea) in a convective hot air dryeren_US
dc.typeArticleen_US
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