CFD simulations of heat transfer in internally helically ribbed tubes

Heating surfaces in power boilers are exposed to very high heat flux. For evaporator protection against overheating, internally helically ribbed tubes are used. The intensification of the heat transfer and the maintenance of the thin water layer in the intercostal space, using ribbed tubes, enables...

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Bibliographic Details
Published in:Chemical and Process Engineering 2016-06, Vol.37 (2), p.251-260
Main Authors: Majewski, Karol, Grądziel, Sławomir
Format: Article
Language:English
Subjects:
heat transfer coefficient
helically internally ribbed tubes
power boilers
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Summary:Heating surfaces in power boilers are exposed to very high heat flux. For evaporator protection against overheating, internally helically ribbed tubes are used. The intensification of the heat transfer and the maintenance of the thin water layer in the intercostal space, using ribbed tubes, enables better protection of the power boiler evaporator than smooth pipes. Extended inner surface changes flow and thermal conditions by influencing the linear pressure drop and heat transfer coefficient. This paper presents equations that are used to determine the heat transfer coefficient. The results of total heat transfer, obtained from CFD simulations, for two types of internally ribbed and plain tubes are also presented.
ISSN:2300-1925
0208-6425
2300-1925
DOI:10.1515/cpe-2016-0020