where, A is the cross sectional area of column, ρa is air
density (kg/m3), ΔT is temperature difference of inlet and
outlet air (°C), u is air velocity (m/s), Ca is air specific heat
(J/kg °C), P is microwave power (W); t is the time (s), mw is
the mass of evaporated water (kg), and Es is the specific
Table 2 Mathematical models given by various authors for the drying