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Related Experiment Videos

A diffusion model for drying of a heat sensitive solid under multiple heat input modes.

Lan Sun1, Md Raisul Islam, J C Ho

  • 1Department of Mechanical Engineering, National University of Singapore, 10 Kent Ridge Crescent, Singapore 119260, Singapore.

Bioresource Technology
|June 28, 2005
PubMed
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Combining heat transfer modes in batch dryers improves drying efficiency. Radiation-coupled convection offers the best balance of high drying rates and low energy consumption for heat-sensitive foods like potatoes.

Area of Science:

  • Food Science
  • Chemical Engineering
  • Heat Transfer

Background:

  • Optimizing drying kinetics and product quality in batch dryers requires efficient energy supply.
  • Combining heat transfer modes (convection, conduction, radiation) can enhance drying processes.
  • Potato slices serve as a model for heat-sensitive materials in drying studies.

Purpose of the Study:

  • To investigate the impact of different heat transfer combinations on potato drying.
  • To compare four distinct heat input schemes: pure convection, radiation-coupled convection, conduction-coupled convection, and radiation-conduction-coupled convection.
  • To develop and validate a two-dimensional drying model.

Main Methods:

  • Experimental drying of potato slices in a custom-designed batch heat pump dryer.

Related Experiment Videos

  • Simultaneous application of conduction and radiation heat transfer modes.
  • Development of a two-dimensional drying model based on liquid water diffusion.

    • Main Results:

    • The developed drying model accurately predicted drying rates and internal temperatures for all tested heat input schemes.
    • Radiation-coupled convection demonstrated superior performance compared to other methods.
    • All tested heat input schemes showed good agreement between model predictions and experimental measurements.

    Conclusions:

    • Radiation-coupled convection is the most effective heat transfer strategy for optimizing potato drying.
    • This method achieves high drying rates while minimizing energy consumption.
    • The findings are crucial for improving industrial batch drying processes for heat-sensitive products.