Ocasio Latorre, Moises Y.

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Development of heat and mass transfer constitutive model for parchment coffee dehydration process
(2015) Ocasio Latorre, Moises Y.; Rodríguez Robles, Francisco; College of Engineering; Ruiz Quiñones, Orlando; Monroig Saltar, Francisco M.; Department of Mechanical Engineering; Rosario, Hector
This thesis presents a mathematical constitutive model, based on the volume averaging method, to predict the temperature and wet based moisture content of parchment coffee during the dehydration process using rotary drum technology. The model considers the two main stages of the dehydration process: 1) the funicular stage which is characterized by the vaporization of water, and 2) the pendular stage which is dominated by convective diffusive phenomena. These driving forces depend on the topological characteristics of the studied porous medium. Mathematical estimates of parameters such as the permeability were performed due to lack of published data. Numerical results are obtained using the finite volume method and appropriate discretization schemes. To validate the model, data from a scale rotary drum dryer was used. The error of the predicted values is characterized by a percentage difference of 9.14% ± 7.69% for temperature and 14.17% ± 9.13% for wet-base moisture content.