Freeze drying with dielectric-material-assisted microwave heating

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Original languageEnglish
Pages (from-to)3077-3088
Journal / PublicationAICHE Journal
Issue number12
Publication statusPublished - Dec 2007
Externally publishedYes


Experimental and theoretical investigations were conducted with regard to the effects of a dielectric material on freeze drying with microwave heating. The experimental results show that the dielectric material can effectively enhance the microwave freeze drying process, and substantial drying time can be saved compared with conventional freeze diying under the operating conditions tested. Theoretical study was performed by numerically solving a heat and mass transfer model of freeze drying with hygroscopic effect using the finite difference method with a moving boundary. The simulation results demonstrate the effectiveness of using the dielectric material in microwave freeze drying, especially when the solid content of the solution to be freeze dried is very low or the solid product has a very small loss factor. Comparisons of the drying curves display good agreements between experimental measurements and model predictions. Based on the profiles of the ice saturation and temperature, mechanisms of heat and mass transfer inside the material were analyzed, and the drying rate-controlling factor was discussed. © 2007 American Institute of Chemical Engineers.

Research Area(s)

  • Aqueous solution, Dielectric material, Diying, Freeze drying, Heat transfer, Mass transfer, Mathematical modeling, Microwave, Porous media, Simulation

Bibliographic Note

Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to [email protected].

Citation Format(s)

Freeze drying with dielectric-material-assisted microwave heating. / Wang, Wei; Chen, Guohua.
In: AICHE Journal, Vol. 53, No. 12, 12.2007, p. 3077-3088.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review