Efectos del secado convectivo en el encogimiento, temperaturas superficiales y caracteristicas estructurales de placas de manzana mediante Analisis Fractal

Translated title of the contribution: Effects of air-drying on the shrinkage, surface temperatures and structural features of Apples slabs by means of Fractal Analysis

V. Santacruz-Vázquez, C. Santacruz-Vázquez, J. Welti-Chanes, R. R. Farrera-Rebollo, L. Alamilla-Beltrán, J. Chanona-Pérez, G. F. Gutiérrez-López

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

Shrinkage-deformation phenomenon of apple slabs during convective drying was studied, aiming to analyse its causes. Apple slabs were dehydrated in an experimental drying tunnel using a factorial design 42. Independent variables were airflow (1, 2, 3 and 4 m/s) and drying air temperature (50, 60, 70 and 80 °C). Relative shrinkage (A/Ao) was evaluated during drying as the ratio of the projected (top view) area of slab at any time during the process (A) to the initial area (Ao) of the same slab. In five punctual measuring zones on the surface of the slab, surface temperatures (ST) and moisture contents (MC) were evaluated. ST and MC were different for each measuring zone, causing irregular dehydration. Fractal analysis was used to evaluate the non-linear (A/Ao) observed pattern and ST distribution. Fractal dimensions for (A/Ao) ratios (FDA) and ST (FDST) were 1.08-1.30 and 1.12-1.54 respectively. Temperatures of 60 ° and 70 ° C, and airflows of 2 and 3 m/s caused the highest irregularity of shrinkage and highest FDA and FDST values. Scanning electron microscopy images for measuring zone were captured and fractal dimension of texture of images were obtained (FDSDBC) it was observed that nonlinear shrinkage was related to irregular microstructure given by FDSDBC.

Translated title of the contributionEffects of air-drying on the shrinkage, surface temperatures and structural features of Apples slabs by means of Fractal Analysis
Original languageSpanish
Pages (from-to)55-63
Number of pages9
JournalRevista Mexicana de Ingeniera Quimica
Volume7
Issue number1
StatePublished - Apr 2008

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