A Numerical Model for Freeze Drying Processes with Infrared Radiation Heating

Abstract

A numerical model has been developed for accurate prediction of freeze drying processes subjected to infrared radiation heating. A spectral two-flux radiation model was incorporated into freeze drying analysis to consider the spectral absorption characteristics of moisture-rich products. The temperature of the infrared heater was found to significantly influence the freeze drying behaviors. At a fixed intensity level at the product surface, a higher heater temperature increased the drying time while temperature in the product was significantly reduced. This result was discussed in relation with the spectral composition of light emitting from infrared heaters.

Acknowledgments

This work was supported by the second stage of the Brain Korea 21 (BK21) Project in 2010.