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Heat transfer at elevated temperatures

  • O. Molerus
  • K.-E. Wirth
Chapter
  • 293 Downloads
Part of the Powder Technology Series book series (POTS, volume 11)

Abstract

From the viewpoint of engineering practice, the influence of temperature defines the most interesting aspect, because low temperature systems are mainly the territory of laboratory experiments in order to find out those features which have been described in the preceding chapters. The influence of temperature has two aspects: below 500 °C there is the correct representation of the influence of the changing physical properties with increasing temperature. With gases there is an increase in thermal conductivity as well as viscosity, and with many technical systems there is a decrease in gas density at constant pressure. As shown in Chapter 6, the situation can become even more complicated due to the effects of chemical reactions inside the fluidized bed. And the most significant aspect of solid materials is the very pronounced, sometimes even abrupt, change in their heat capacities with increasing temperature. Figure 11.1 illustrates the significance of all these effects on the heat transfer in bubbling fluidized beds using quartz particles in air.

Keywords

Heat Transfer Heat Transfer Coefficient Convective Heat Transfer Radiative Heat Transfer Cooling Surface 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media Dordrecht 1997

Authors and Affiliations

  • O. Molerus
    • 1
  • K.-E. Wirth
    • 1
  1. 1.Lehrstuhl für MechanischeVerfahrenstechnik der Universität Erlangen-NürnbergGermany

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