Effective moisture diffusivity estimation from drying data. A comparison between various methods of analysis

Zogzas, NP; Maroulis, ZB

dc.contributor.author	Zogzas, NP	en
dc.contributor.author	Maroulis, ZB	en
dc.date.accessioned	2014-03-01T01:11:55Z
dc.date.available	2014-03-01T01:11:55Z
dc.date.issued	1996	en
dc.identifier.issn	0737-3937	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/11865
dc.subject.classification	Engineering, Chemical	en
dc.subject.classification	Engineering, Mechanical	en
dc.subject.other	Dryers (equipment)	en
dc.subject.other	Drying	en
dc.subject.other	Food products	en
dc.subject.other	Mass transfer	en
dc.subject.other	Mathematical models	en
dc.subject.other	Moisture	en
dc.subject.other	Drying calculations	en
dc.subject.other	Model parameter	en
dc.subject.other	Moisture diffusivity	en
dc.subject.other	Diffusion in solids	en
dc.title	Effective moisture diffusivity estimation from drying data. A comparison between various methods of analysis	en
heal.type	journalArticle	en
heal.identifier.primary	10.1080/07373939608917163	en
heal.identifier.secondary	http://dx.doi.org/10.1080/07373939608917163	en
heal.language	English	en
heal.publicationDate	1996	en
heal.abstract	Moisture diffusivity is the most crucial property in drying calculations. Literature data are scarce due to the variation of both experimental measurement techniques and methods of analysis. The effect of using different methods of analysis on the same experimental drying data is examined in this work. Detailed and simplified mathematical models, incorporating moisture diffusivity as model parameter, are applied. It is proved, that significant differences in the calculated values of moisture diffusivity result when different models are used, and probably these differences explain the variation in literature data. Thus, the adoption of a standardised methodology will be of great importance in moisture diffusivity evaluation. The above findings resulted from the application of four alternative models on the drying data of three common food materials, potato, carrot and apple. A typical pilot plant scale dryer with controlled drying air conditions was used for the experiments. The moisture content dependence of the diffusion coefficient was proved significant at the last drying stage, while the temperature dependence followed the well known Arrhenius relation. The effects of considering external mass transfer and volume shrinkage during drying, were also investigated.	en
heal.publisher	MARCEL DEKKER INC	en
heal.journalName	Drying Technology	en
dc.identifier.doi	10.1080/07373939608917163	en
dc.identifier.isi	ISI:A1996VD69200004	en
dc.identifier.volume	14	en
dc.identifier.issue	7-8	en
dc.identifier.spage	1543	en
dc.identifier.epage	1573	en