Freeze-drying of mannitol aqueous solution with dielectric-materialassisted microwave heating

Guohua Chen, W. Wang

Research output: Chapter in book / Conference proceedingConference article published in proceeding or bookAcademic researchpeer-review


Experimental and theoretical investigations were made on verification of dielectric-material-assisted microwave freeze-drying proposal by the authors. Experimental results show that dielectric material can effectively enhance the microwave freeze-drying process. More than 20% of drying time was saved for dielectric-material-assisted microwave freeze-drying compared to conventional freeze-drying under the operating conditions tested. Theoretical study was performed by numerically solving a heat and mass transfer model of freeze-drying with hydroscopic effect using the finite deference method with a moving boundary. Simulation results also demonstrate the effectiveness of using dielectric material in microwave freeze-drying, and microwave heating is less useful 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 display good agreements of drying curves between experimental measurements and model predictions. Based on 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.
Original languageEnglish
Title of host publicationCHISA 2006 - 17th International Congress of Chemical and Process Engineering
Publication statusPublished - 1 Dec 2006
Externally publishedYes
EventCHISA 2006 - 17th International Congress of Chemical and Process Engineering - Prague, Czech Republic
Duration: 27 Aug 200631 Aug 2006


ConferenceCHISA 2006 - 17th International Congress of Chemical and Process Engineering
Country/TerritoryCzech Republic

ASJC Scopus subject areas

  • Chemical Engineering(all)

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