Heat and Mass Transfer in Structural Ceramic Blocks: An Analytical and Phenomenological Approach

Stephane K. B. M. Silva, Carlos J. Araújo, João M. P. Q. Delgado, Ricardo S. Gomez, Hortência L. F. Magalhães, Maria J. Figueredo, Juliana A. Figueirôa, Mirenia K. T. Brito, José N. O. Neto, Adriana B. C. Pereira, Leonardo P. L. Silva and Antonio G. B. Lima
Additional contact information
Stephane K. B. M. Silva: Department of Mechanical Engineering, Federal University of Campina Grande, Campina Grande 58429-900, Brazil
Carlos J. Araújo: Department of Mechanical Engineering, Federal University of Campina Grande, Campina Grande 58429-900, Brazil
João M. P. Q. Delgado: CONSTRUCT-LFC, Department of Civil Engineering, Faculty of Engineering, University of Porto, 4200-465 Porto, Portugal
Ricardo S. Gomez: Department of Mechanical Engineering, Federal University of Campina Grande, Campina Grande 58429-900, Brazil
Hortência L. F. Magalhães: Department of Chemical Engineering, Federal University of Campina Grande, Campina Grande 58429-900, Brazil
Maria J. Figueredo: Department of Agro-Industrial Management and Technology, Federal University of Paraíba, Bananeiras 58220-000, Brazil
Juliana A. Figueirôa: Federal Institute of Education, Science and Technology of the Sertão Pernambucano, Petrolina 56316-686, Brazil
Mirenia K. T. Brito: Department of Mechanical Engineering, Federal University of Campina Grande, Campina Grande 58429-900, Brazil
José N. O. Neto: Integrated Colleges of Ceará, Iguatú 63508-025, Brazil
Adriana B. C. Pereira: Department of Chemical Engineering, Federal University of Campina Grande, Campina Grande 58429-900, Brazil
Leonardo P. L. Silva: Department of Industry, Federal Institute Education, Science and Technology of Paraiba, Cajazeiras 58900-000, Brazil
Antonio G. B. Lima: Department of Mechanical Engineering, Federal University of Campina Grande, Campina Grande 58429-900, Brazil

Energies, 2022, vol. 15, issue 19, 1-16

Abstract: The ceramic industry is one of the pillars of the Brazilian economy, characterized by making low-cost products and an obsolete manufacturing process from a technological point of view. Among the various stages of production of ceramic materials, drying is one of the most energy-consuming and, in general, causes structural damage to the product, compromising its mechanical performance and final quality. Despite the relevance, studies on the drying of ceramic materials are mostly conducted at the experimental level and limited to some specific operational conditions. In this scenario, this research aims to theoretically study the heat and mass transfers in industrial ceramic blocks during drying. Based on the lumped analysis method, and considering the dimensional variations of the material, new phenomenological mathematical models and their respective analytical solutions are proposed to describe the kinetics of mass loss and heating of the material. The predicted results referring to the thermal and gravimetric behavior of the block during the oven drying process under different conditions are compared with the experimental data, obtaining excellent agreement between the results. Furthermore, the transport coefficients were estimated, proving the dependence of these parameters on the drying air conditions. The convective mass transfer coefficient ranged from 6.69 × 10 –7 to 15.97 × 10 –7 m/s on the outer surface of the block and from 0.70 × 10 –7 to 1.03 × 10 –7 m/s on the inner surface of the material when the drying air temperature ranged from 50 to 100 °C. The convective heat transfer coefficient ranged from 4.79 to 2.04 W/(m 2 .°C) on the outer surface of the block and from 1.00 to 0.94 W/(m 2 .°C) on the inner surface of the material when air temperature ranged from 50 to 100 °C.

Keywords: ceramic block; drying; lumped analysis; analytical; simulation (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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