Simulation of Heat and Mass Transfer in Ethiopian Fresh Injera Drying Process

Belay, Alamrew

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dc.contributor.author	Belay, Alamrew
dc.date.accessioned	2020-06-12T06:23:44Z
dc.date.available	2020-06-12T06:23:44Z
dc.date.issued	2020-03
dc.identifier.uri	http://hdl.handle.net/123456789/11029
dc.description.abstract	A mathematical model was developed to describe the heat and moisture transport pro cesses occurring in the convective drying of injera. The numerical systems of heat and moisture partial differential equations (PDEs) were numerically solved by the ﬁnite el ement method (FEM) using COMSOL Multi-physics, 5.3. To validate the predicted results, a series of laboratory drying experiments were undertaken using a tunnel dryer atairtemperature(323.15and333.15K)andvelocity(0.25and0.5ms−1). Thepredicted against the experimental result showed a very good agreement with a coefﬁcient of de termination (R2 > 0.95 for both temperature and moisture ratio ) and Root mean square error(RMSE<0.05foramoistureratioandRMSE<3.5Kfortemperature). Theimpor tant results from this research are the attainment of the temperature and moisture ratio distribution of the injera at different time and position (thickness and diameter),clearly showsequalityofdrying. Thetimerequiredtoreducedthemoistureofinjerafrom1(-) to 0.03 (-) at the temperature of 333 K, RH=11% and air velocity of 0.5ms−1 was 125 min. Both temperature and velocity were signiﬁcantly more interested in moisture reduction when drying was conducted ( p <0.05). The interaction effect between them also indicates a signiﬁcance difference (p <0.05) on moisture removal rate of injera.	en_US
dc.language.iso	en	en_US
dc.subject	Process Engineering	en_US
dc.title	Simulation of Heat and Mass Transfer in Ethiopian Fresh Injera Drying Process	en_US
dc.type	Thesis	en_US