Numerical simulation is used to compare the temperature distribution existing during microwave or conven-tional heating by hot oil bath of a reaction volume. The simulation is applied to the sol-gel synthesis of TiO2 nanopowders, considering temperature dependent materials parameters. A WR340-based single mode applicator operating at 2.45 GHz is considered, with a cylindrical load positioned in regions of predominant electric field. A temperature homogeneity index, defined as the ratio between the average temperature and its standard deviation at a certain time, is used to compare homogeneity of conventional and microwave heating at different power densities, from 370 to 7400 W/L. Based on that comparison, a selection chart of the more homogenous heating process as a function of power density and average temperature of the reaction volume is defined and can be used to select the experimental conditions expected to lead to a more or less homogeneous particle size of the products. A dedicated instrumented model, including three optical fibres, is developed as well, for validation purposes. Experimental validation showed a very good predictive capability of the model, with errors on estimated tem-perature lower than 3 degrees C at temperatures lower than 80 degrees C.

Procedure to generate a selection chart for microwave sol-gel synthesis of nanoparticles / Veronesi, Paolo; Colombini, Elena; Canarslan, Özgür Sevgi; Baldi, Giovanni; Leonelli, Cristina. - In: CHEMICAL ENGINEERING AND PROCESSING. - ISSN 0255-2701. - 189:(2023), pp. N/A-N/A. [10.1016/j.cep.2023.109383]

Procedure to generate a selection chart for microwave sol-gel synthesis of nanoparticles

Veronesi, Paolo;Colombini, Elena;Baldi, Giovanni;Leonelli, Cristina
2023

Abstract

Numerical simulation is used to compare the temperature distribution existing during microwave or conven-tional heating by hot oil bath of a reaction volume. The simulation is applied to the sol-gel synthesis of TiO2 nanopowders, considering temperature dependent materials parameters. A WR340-based single mode applicator operating at 2.45 GHz is considered, with a cylindrical load positioned in regions of predominant electric field. A temperature homogeneity index, defined as the ratio between the average temperature and its standard deviation at a certain time, is used to compare homogeneity of conventional and microwave heating at different power densities, from 370 to 7400 W/L. Based on that comparison, a selection chart of the more homogenous heating process as a function of power density and average temperature of the reaction volume is defined and can be used to select the experimental conditions expected to lead to a more or less homogeneous particle size of the products. A dedicated instrumented model, including three optical fibres, is developed as well, for validation purposes. Experimental validation showed a very good predictive capability of the model, with errors on estimated tem-perature lower than 3 degrees C at temperatures lower than 80 degrees C.
2023
189
N/A
N/A
Procedure to generate a selection chart for microwave sol-gel synthesis of nanoparticles / Veronesi, Paolo; Colombini, Elena; Canarslan, Özgür Sevgi; Baldi, Giovanni; Leonelli, Cristina. - In: CHEMICAL ENGINEERING AND PROCESSING. - ISSN 0255-2701. - 189:(2023), pp. N/A-N/A. [10.1016/j.cep.2023.109383]
Veronesi, Paolo; Colombini, Elena; Canarslan, Özgür Sevgi; Baldi, Giovanni; Leonelli, Cristina
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11380/1337311
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