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Related Experiment Videos

Heat and water transfer in a rotating drum containing solid substrate particles.

M A I Schutyser1, F J Weber, W J Briels

  • 1Wageningen Centre for Food Sciences, Wageningen, The Netherlands. maarten.schutyser@wur.nl

Biotechnology and Bioengineering
|March 26, 2003
PubMed
Summary

A discrete particle model simulates heat and moisture transfer in solid-state fermentation (SSF) drums. The model accurately predicts temperature and moisture distribution, aiding process optimization for granular media.

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Area of Science:

  • Biochemical Engineering
  • Particle Technology

Background:

  • Solid-state fermentation (SSF) requires precise control of heat and moisture for optimal microbial activity.
  • Previous discrete particle models simulated mixing but lacked heat and moisture transfer capabilities.

Purpose of the Study:

  • To extend a discrete particle model to include heat and moisture transfer for SSF simulations.
  • To investigate the impact of process parameters on heat and moisture distribution in granular media.

Main Methods:

  • Experimental determination of interparticle heat transfer coefficients.
  • Incorporation of heat transfer via interparticle contacts.
  • Modeling of intraparticle water absorption and interparticle free water transfer.
  • Experimental study of moisture profiles using a fluorescent tracer.

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Main Results:

  • The extended model accurately predicts heat transfer and temperature gradients in wheat grain beds.
  • The model captures moisture profile development during spraying and mixing.
  • Optimum water distribution is achieved through rapid mixing or a combination of short spraying and subsequent mixing.

Conclusions:

  • The enhanced discrete particle model is a powerful predictive tool for SSF processes.
  • The model can inform operating strategies for design and scale-up of granular media processes.
  • Understanding heat and moisture dynamics is crucial for efficient SSF operation.