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The use of sensors to measure the local heat and mass transfer during the cooling of fruits and vegetables conditioned in a pallet.

Author(s) : ALVAREZ L. G., LETANG G., BILLIARD F.

Summary

Heat and mass transfer between products inside bins and cooling air in forced convection was studied. A pallet which contained 15 bins filled with hollow plastic spheres (diameter 0.075 m) was fitted-up. This configuration could represent from an aerodynamics point of view the shape of some real products. The local velocity and the intensity of the turbulence were experimentally determined at different positions inside the bins for several airflow conditions. The measurements of local overall heat transfer coefficients were accomplished by using many sensors especially constructed for this case. A significant local heterogeneity of heat transfer was verified which corresponds to the aerodynamical behaviour of airflow. Several empirical relationships were established between the heat transfer coefficient and the airflow parameters. A numerical model allows to predict the cooling kinetics of products conditioned in a pallet. This model takes into account water evaporation at the product surface and the local heat transfer coefficients inside bins.

Details

  • Original title: The use of sensors to measure the local heat and mass transfer during the cooling of fruits and vegetables conditioned in a pallet.
  • Record ID : 1996-2835
  • Languages: English
  • Source: The post-harvest treatment of fruit and vegetables. Systems and operations for post-harvest quality. Proceedings COST 94.
  • Publication date: 1993/09/14
  • Document available for consultation in the library of the IIR headquarters only.

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