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IIR document

Influence of thermophysical properties in nucleate boiling.

Number: pap. n. 1234

Author(s) : BUCHHOLZ N., LUKE A.

Summary

The heat transfer coefficient in nucleate boiling is mainly determined by the heat flux, the saturation pressure, the thermophysical properties of the liquid and the properties of the material and the structure of the heating surface. However, new prediction methods for the heat and mass transfer in boiling will be required in future to replace the empirical correlations used until now, since they are inexact for many cases. Recently, new correlations have been established to describe the influence of the physical properties in nucleate boiling. In this context, the heat transfer for different hydrocarbons boiling on the outside of a horizontal tube (mainly of copper) with defined surface properties will be presented and compared to the new correlations from literature. The results show that the equation developed recently is only valid for limited applications of pure fluids and within certain boundary conditions. A proposal for the modification of the correlation is presented.

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Pages: 8

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Details

  • Original title: Influence of thermophysical properties in nucleate boiling.
  • Record ID : 30026084
  • Languages: English
  • Source: Proceedings of the 25th IIR International Congress of Refrigeration: Montréal , Canada, August 24-30, 2019.
  • Publication date: 2019/08/24
  • DOI: http://dx.doi.org/10.18462/iir.icr.2019.1234

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