Abstract

In this research, effective heat transfer properties were evaluated in a fixed bed dryer packed with soybeans, fitting a bidimensional pseudo-homogeneous model to the experimental temperature profiles, obtained from a fixed bed dryer, heated by the wall and by the injected air, at steady state conditions with various air flow rates. The results reveal that both thermal parameters: effective radial conductivity (Kr) and wall heat transfer coefficient (hw) may be represented as an increasing and linear function of air flow rate, practically independent of the soybeans equilibrium moisture content within the range of experimental conditions used.

Highlights

  • Freqüentemente os cereais são colhidos com um teor de umidade inadequado ao seu armazenamento, sendo usual diminui-lo mediante o processo de secagem

  • The results reveal that both thermal parameters: effective radial conductivity (Kr) and wall heat transfer coefficient (hw) may be represented as an increasing and linear function of air flow rate, practically independent of the soybeans equilibrium moisture content within the range of experimental conditions used

  • Tanto a condutividade efetiva radial (kr) como o coeficiente de transferência de calor parede-leito (hw) apresentaram um comportamento crescente e linear com o aumento da vazão e foram praticamente insensíveis ao teor de umidade da soja na faixa de condições experimentais exploradas

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Summary

Introduction

Freqüentemente os cereais são colhidos com um teor de umidade inadequado ao seu armazenamento, sendo usual diminui-lo mediante o processo de secagem. Foram efetuados ensaios em um secador de soja em leito fixo, aquecido de forma direta e indireta, visando estimar as propriedades térmicas efetivas radiais: hw (coeficiente de transferência de calor parede-leito) e kr (condutividade térmica efetiva radial) bem como avaliar a influência da vazão de ar e do teor de umidade dos grãos sobre essas propriedades.

Results
Conclusion

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