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Experimental investigation and thin-layer modelling of cassava slice drying

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Abstract

This study investigated the effects of drying temperature, slice thickness and slice angle on cassava slice drying and determined suitable thin-layer model with an online weighing fixed bed (Macro-TGA). The experimental results showed that drying temperature and slice thickness were critical factors for cassava slice drying. Based on the experimental data, the activation energy for diffusion was calculated to be 39.37 kJ mol−1, characterizing the drying difficulty of the cassava slice drying. Ten thin-layer drying models, which were semi-theoretical models or empirical, were fitted to the drying data, and the correlation coefficient (R2), Chi-square (χ2), root mean square error and applicability were compared. It was concluded that two-term exponential model described the drying most satisfactorily, with good statistical analysis coefficients and simple functions of model parameters. The model parameters were determined as functions of temperature and slice thickness. Predictions of one case with two-term exponential model were compared with experimental data and the correlation coefficient was 0.99852, indicating good prediction.

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Acknowledgements

This work was supported by the National Key R&D Program of China (Grant No. 2017YFB0603901). The authors thank Hui Zhou from Tsinghua University for his help in manuscript revision.

Funding

This study was funded by Ministry of Science and Technology of the People’s Republic of China (Grant No. 2017YFB0603901).

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Authors and Affiliations

  1. Tsinghua University–University of Waterloo Joint Research Centre for Micro/Nano Energy and Environment Technology, Beijing Key Laboratory of CO2 Utilization and Reduction Technology, Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Energy and Power Engineering, Tsinghua University, Beijing, 100084, People’s Republic of China

    Yu Gao, Xiaoxiao Yang, Leizhe Chu, Yanguo Zhang & Qinghai Li

  2. Beijing Nowva Energy Technology Co., Ltd, Beijing, 100085, People’s Republic of China

    Leizhe Chu

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  1. Yu Gao
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  2. Xiaoxiao Yang
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Correspondence to Yanguo Zhang or Qinghai Li.

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Gao, Y., Yang, X., Chu, L. et al. Experimental investigation and thin-layer modelling of cassava slice drying. J Therm Anal Calorim 147, 1379–1387 (2022). https://doi.org/10.1007/s10973-020-10401-x

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