SVIBOR - Project code: 2-15-020

MINISTRY OF SCIENCE AND TECHNOLOGY

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tel.: +385 1 459 44 44, fax: +385 1 459 44 69
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Project code: 2-15-020

MICROWAVE DRYING

Main researcher: SKANSI, DARKO (43452)

Assistants

TOMAS, SREĆKO (154264)

Type of research: applied
Duration from: 01/01/91. to 12/31/95.

Papers on project (total): 33
Papers on project quoted in Current Contents: 7

Institution name: Fakultet kemijskog inženjerstva i tehnologije, Zagreb (125)
Department/Institute: Department of mechanical and thermal engineering
Address: Marulićev trg 20, 41000 Zagreb, Croatia
City: 10000 - Zagreb, Croatia

Communication: Fax: 385 (0)1-4550-725 i 449-708; Phone: 385 (0)1-4552-477

Summary: The drying kinetics of porous material, in conditions of microwave heating is investigating. The laboratory test equipment which consist of commercial microwave oven, electronics balance and thermometer was developed. Measuring the difference of the sample weight and temperature, the dependences of the moisture content, the drying rate and the temperature of the sample vs. drying period is examining. At the same time the microwave power were taken as a function parametar. The analogous investigations of the convective drying kinetics are making for use of comparison with the microwave drying. The mathematics models for the description of the microwave and convective drying kinetics were developed. The models enabling the deffining the dependence of the drying kinetics parametars upon the driving force of the taken process. On this way, the bases of the simulating of the drying kinetics and governing of the investigated processes was established. In this moment, the experimental and theoretical verifications of the developed models, on different materials and with others methodes of drying are of the interest.

Keywords: microwave drying, drying kinetiks, modelling of drying kinetics, porous materials, convective drying.

Research goals: The relations between primary and macroskopics properties ofthe porous material and mechanismes of the process governing willbe investigated. Obtained correlations make it possible to analyse thebehaviour of the sample and the governing of the separationprocess based on primary and equilibrium conditions. Modification of primary properties with goals changes otprocess parametars results with the increasing the efficiency ofthe process. The developing of the model for optimal governing of thedrying process with maximum allowed drying rate will be resultingwith decreasing specific energy consuption for chosen process. The laboratory model have to ensure the scale up of theprocess, as well as the linear function dependence between thepower density and the drying period of exposed material, orrelations which enabled the process control even in the unlinear(unsteady) conditions.

Other information about the project.


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