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• W89285298 abstract "At Philips Components in Roermond ceramic capacitors and actuators are produced with a multilayer technology. One o f the first steps in the production process is foil casting. This research is concemed with the heat transfer processes in the tunnel dryer of a foil casting machine. Although a lot o f development work has been carried out on the production process, the tunnel dryer is still a black box and the existence of non-homogeneous drying is difficult to explain. The objective of this research project was to get insight in the transversal uniformity o f the airflow and the heat transfer toward the foil in a cross-section of the tunnel. The ceramic foil, carried by a metal conveyor belt, dries on its way through the tunnel by radiation from heating coils and by a forced convective air flow. Due to the hot side walls of the rectangular duct buoyancy forces may create natural convection that may have an influence on the heat transfer. An analysis with dimensionless correlations has shown that radiation is the most important mechanism for heat transfer, although the effect o f natural convection can not be neglected indeed. Both mechanisms have been examined independently with experiments and numerical simulations. The flow through the duct has been modelled with the Computational Fluid Dynamics package Fluent. This makes it possible to analyse the influence of the hot tunnel walls on the airflow and the contribution of this flow to the heat flux toward the belt. Fluent simulations have demonstrated the existence of buoyancy rolls and their positive effect on the uniformity of the convective heat transfer. The transversal velocities are in the beginning of the tunnel about 25 percent o f the axial velocities but they slowly decrease further downstream. The radiative heat transfer in a cross-section has been simulated with the finite element program Ansys. These simulations have shown that the heat radiation toward the middle of the belt is about 20 percent larger than to the edges. Further it has been tried with the Ansys simulations to find a way to make the radiation from the heating coil and the tunnel walls toward the belt more uniform. Experiments in a tunnel dryer has been performed to verify the simulations and to demonstrate the non-uniform transversal heat transfer that causes the non-homogeneous drying front o f the foil. A suitable method has been developed to measure lateral temperature differences at the belt or in the air above during their way through the tunnel. However after translating the temperature differences into radiative heat flux differences, it has been concluded that this method is quantitatively not comparable with the Ansys simulations. On the ground of the performed simulations and experiments, suggestions have been made for an improved tunnel design. The temperature control system can be improved by connecting the control thermocouple to the heating coil rather than to the side wall. Making the flow more turbulent results in a faster development of the velocity profiles and a more uniform convective heat exchange. A uniform radiative heat flux can be achieved by developing a heating coil that gives the top and side walls equal temperatures. These modifications may improve the heat transport in the tunnel dryer; leading to a more homogeneous drying front." @default.
• W89285298 created "2016-06-24" @default.
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• W89285298 date "1996-08-01" @default.
• W89285298 modified "2023-09-26" @default.
• W89285298 title "Analysis of heat transfer processes in the tunnel dryer of a foil casting machine" @default.
• W89285298 hasPublicationYear "1996" @default.
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