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Some numerical experiments with liquid diffusion model and their practical significance.

Author(s) : ISLAM M. R., HO J. C., MUJUMDAR A. S.

Summary

For heat-sensitive materials, there is no vapour generation within the solid during drying which permits application of the simple liquid diffusion model to simulate the falling rate drying period quite satisfactorily. This paper demonstrates how simulation of the one dimensional diffusion model of both energy and moisture transfer can yield valuable information about the advantages of multimode heat input applied continuously or intermittently e.g. combined convection and radiation, convection and microwave etc. Interestingly, the model can also provide useful guidance in selecting ranges over which relatively expensive means of drying e.g. heat pump to dehumidify the drying air, or microwave power etc. should be applied. It is shown that it is possible to reduce capital costs by using smaller capacity heat pumps or magnetrons to service two or more drying chambers by appropriate sequential switching between them. This also results in reduced running costs since the use of electrical power is reduced as well.

Details

  • Original title: Some numerical experiments with liquid diffusion model and their practical significance.
  • Record ID : 2007-0240
  • Languages: English
  • Source: ADC 2003. Exploring new frontiers in drying technology through innovation in processes and equipment, product quality enhancement, energy-efficient and environment-friendly operations. Proceedings of the 3rd Asia-Pacific Drying Conference + CD-ROM.
  • Publication date: 2003/09/01

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