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Experimental Study of the Drying Kinetics of the Coconut Shells (Nucifera) of Cameroon

Materials Sciences and Applications 2013年第12期4卷 822-830页

作者： Dieunedort Ndapeu Ebénezer Njeugna sophie Brogly bistac Jean Yves Drean Médard Fogue Josepha Ngenefeme Foba Chemestry School University of Haute Alsace Mulhouse France ENSET University of Douala Douala Cameroon ENSISA University of Haute Alsace Mulhouse France Faculty of Science University of Buea Buea Cameroon IUT FV de Bandjoun University of Dschang Dschang Cameroon

Water diffusion of two species of coconut shells (CS) nucifera from Cameroon, in the case of drying, was experimentally studied. The experiment was done with the aid of an oven, by the method of gravimetric batch control of the mass of the test samples with the temperatures varied from 70° to 180° Celsius. The shells of mature coconuts from two species were conserved in the laboratory at a temperature ranging between 20° and 23° Celsius for two months before being mechanically cleaned. This study allows not only the determination of the water content of the shells, but also the identification of the drying model. It is thus from the ten model tests, and the statistical analysis shows that the Midilli model best predicted this drying phenomenon. The coefficient of effective diffusion was determined at different temperatures which permitted the evaluation of the activation energy per the Arrhenius equation.

关键词： Coconut Shells Drying Model Drying Kinetics Effective Diffusivity Activation Energy

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Experimental Study of the Water Absorption Kinetics of the Coconut Shells (Nucifera) of Cameroun

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Materials Sciences and Applications 2016年第3期7卷 159-170页

作者： Dieunedort Ndapeu Ebénezer Njeugna Nicodème Rodrigue Sikame sophie Brogly bistac Jean Yves Drean Médard Fogue IUT FV de Bandjoun University of Dschang Dschang Cameroon ENSET University of Douala Douala Cameroon Chemestry School University of Haute Alsace Mulhouse France ENSISA University of Haute Alsace Mulhouse France

The study is focused on the phenomenon of diffusion of water through the shells of two coconut species (coconut nucifera) of Cameroun. The kinetics absorption of water was studied experimentally by the gravimetric method with discontinuous control of the mass of the samples at the temperature of 23℃. The mature coconut shells were cleaned mechanically, cut in a spherical shape and placed in a drying oven with 105℃ for 4 hours before being plunged in distilled water at 23℃. This study made it possible not only to determine the rate of water absorbed, but also to model the water kinetic absorption of the shells. Of the two models tested (Peleg and Page), the Page model predicted very well the experimental data. The Fick law made it possible to evaluate the effective diffusivity coefficients at the initial and final phases of absorption. The effective diffusivity coefficient was given from the Arrhenius equation.

关键词： Coconut Shells (CSs) Drying Absorption Coefficient of Effective Diffusivity Activation Energy

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Elaboration and Characterization of a Composite Material Based on <i>Canarium schweinfurthii</i>Engl Cores with a Polyester Matrix

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Materials Sciences and Applications 2020年第3期11卷 204-215页

作者： Dieunedort Ndapeu Francis Tamwo Morino Bernard Nganou Koungang Ghislain Tchuen Nicodème R. Sikame Tagne sophie bistac Ebénezer Njeugna Research Unit of Industrial Systems and Environmental Engineering (URISIE) UIT-FV Bandjoun University of Dschang Bandjoun Cameroon Research Unit of Mechanics and Physical Systems Modelling (UR2MSP) Department of Physics University of Dschang Dschang Cameroon Mechanics and Adapted Materials Laboratory (LAMMA) ENSET Douala Cameroon Physics and Macromolecular Engineering Laboratory (LPIM) UHA Mulhouse France

The aim of this work was to develop and characterize a polyester matrix composite material based on Canarium schweinfurthii Engl core granule. The particle size and the mass fractions of these cores used as fillers in this composite were the two optimization parameters. The experimentation of the twelve sample areas was based on the following optimization parameters: Three particles sizes of 80 1 2 3 ·m-3, which allows us to admit that this composite belongs to the family of light materials. The maximum compressive stress at break was obtained for the formulation 40% filler of size T3. This compressive stress at maximum rupture is in the range of 199.14 MPa. From 0% to 45% of filler, the flexural Young’s modulus of the composite increases whatever the particle size. The highest value is obtained for T2 particle size, i.e. 13.11 GPa. The static friction coefficient of the composite on wood increases as the filler content varies from 0.30 to 0.42. Thus, in view of the properties obtained, this composite can be used as alternative solutions in industrial applications, for the manufacturing of shoe heel, house ceiling, floors for housing and table support.

关键词： Canarium schweinfurthii Engl Characterization Composite Polyester Filler

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