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ABSTRACTThe effect of the periodical application of airflow reversals on drying rate has been investigated during the packed‐bed drying of carrots. Drying experiments were obtained from a complete 34 factorial design with air temperature (50, 70 and 90C), air velocity (2, 4 and 6 m/s), combined product thickness/bed height (0.001/0.05, 0.01/0.1 and 0.02/0.15 m/m) and frequency of application of the flow reversal (every 900 and 1800 s, and without reversals) as independent variables. Experimental data were fitted to the first‐order exponential model (FOEM) and the Page's model in order to estimate the drying rate constant. A normal quantile–quantile plot for the residuals demonstrated the inadequacy of the FOEM to describe satisfactorily the moisture evolution data. As expected, increasing air temperature and air velocity causes an increase on the drying rate, while a higher product and bed thickness causes the drying rate to decrease (...
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