illustrates the evolution of this output power variation applied to different drying conditions
It is clear that power intensity was increased exponentially during the drying process. Thus we have defined a multiplication factor of microwave power (a) as being equal to the ratio of final power intensity (Psf) and the initial one (Psi)
Average of this power multiplicative factor was about 13 (seeTable1for details), i.e. during drying without power control, the final power density is 13 times higher than the initial power density due to the fact that at fixed output power at the end of drying, the final mass is equal to 1/13 of the initial mass. This specific power increase at the end of drying could lead to product charring and make the final quality unacceptable.