CONTRIBUTIONS TO MODELING THE MICROWAVE CROP DRYING BY MEANS OF SIMILATUDE METHOD
In this study the simulation possibility of microwave crop drying is presented,based on experiments and by applying semi-empirical method.By using the analogies between the convective and microwave dehydration process a chance has been found to derive the microwave drying rate function,by modifying the basic equation of surface evaporation process.As it is well known the microwave drying process has numerous special features that frequently hinder the process description.In order to manage this problem one of the most probable methods could be deliberately adapting the adequate scientific findings coming from the convective procedure,because semi-empirical models for convective drying of particulates have been well developed; consequently they can serve appropriately precise data for the practice.According to the general law of similarity method the semi-empirical models that are valid for convective conditions – after the appropriate modification – can be usable for the conditions of microwave drying as well.In this meaning the drying coefficient plays similar roll to that of the specific reaction rate in the chemical reaction kinetics.In addition the global principle of similarity method gives a chance to originate the governing equation of microwave drying in the transport function of the surface evaporation.This problem can be managed easier if the dehydration potential coefficient is introduced,because the drying rate as a function of the dehydration potential coefficient shows exponential character and its maximum - in theory - is equal to the evaporation rate on the free water surface.
microwave drying modeling similarity method semi-empirical process simulation
J.Beke
Szent István University Institute for Process Engineering,G(O)d(O)ll(O),H-2100,Hungary
国际会议
The 18th International Drying Symposium Conference(第十八届国际干燥学术大会(IDS2012))
厦门
英文
1-5
2012-01-11（万方平台首次上网日期，不代表论文的发表时间）