DSpace
 

KNUSTSpace >
Theses / Dissertations >
College of Engineering >

Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/4051

Title: Water diffusion coefficients of selected cereals and legumes grown in Ghana as affected by temperature and variety
Authors: Antwi, Godfred Isaac
Keywords: Maize
Soybean
Cowpea Arrhenius–type equation
Diffusion coefficient
Modelling
Water Absorption
Issue Date: 19-Jun-2011
Abstract: The kinetics of water absorption by six newly released maize (Abrohemaa, Omankwa, Abotem,Abeleehi, Dorke SR and Akposoe), two cowpea (Tonaand Nhyira) and two soybeans (NagbaarandAnidaso) hybrids of cereals and legumes grown in Ghana were studied by a gravimetric method during soaking at four temperatures of 30, 40, 50 and 60ºC to determine their moisture diffusivity. The results showed that the absorption kinetics followed Fick's law of diffusion during the first hours of soaking and the water absorption patterns were dependent on temperature and variety. The estimated values for water diffusion coefficients varied from 2.54 x 10-10 to 4.89 x 10-10 m2/s, 4.36 x 10-10 to 6.28 x 10-10 m2/s and from 2.90 x 10-10 to 6.75 x 10-10m2/s for maize, cowpea and soybean varieties respectively. An Arrhenius-type equation described the strong temperature effect on the diffusion coefficient with activation energies ranging from 7.04 to 9.09 kJ/mol for maize 7.73 to 8.56 kJ/mol for cowpea and 5.51 to 8.14 kJ/mol for soybeans
Description: A thesis submitted to the Department of Agricultural Engineering, Kwame Nkrumah University of Science and Technology in partial fulfilment for the requirements for the degree of Master of Science in Food and Postharvest Engineering, 2011
URI: http://hdl.handle.net/123456789/4051
Appears in Collections:College of Engineering

Files in This Item:

File Description SizeFormat
Final.pdf874.58 kBAdobe PDFView/Open

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

 

Valid XHTML 1.0! DSpace Software Copyright © 2002-2010  Duraspace - Feedback