The analysis and design of milk pasteurization system by using radio frequency electric fields

Abstract

An analysis and design of dielectric heating system by using radio frequency electric field (RFEF) will be presented for the milk pasteurization process. It is a technique to transmit the electric fields into the intermediary by using the RFEF. To determine heat distribution in the dielectric loads, which electric field intensity are analyzed to be suitable for fluid and milk. In heating process, the heated material must be the polar molecules to perform the best efflciency of electric fleld transmission into the medium in order to increase the temperature of medium to greater heights. The electric fleld distributions on the lossy medium was analyzed using the CST EM STUDIO program. To investigate the difference of electric power on heating predicted by the theoretical model. In order to verify the simulation results. The proposed system is realized and experimentally examined. The applicator of RFEF with excited by 40 MHz signal and electric fleld strength of 1.6 kV/cm. In the results, it is found that the temperature of milk would be increased about 72.3°C, the process will be take approximately 2 minutes, and reduced population of bacteria 109,260 cfu/ml. Moreover, the investigation result revealed that the temperature of 71.7°C, it will be eliminated the bacteria in milk and extended shelf life of milk. The advantage of the principle of radio frequency electric flelds is that it can be applied to eliminate the bacteria in milk pasteurization.