Lyon's integral: turbulent thermal conductivity and thickness of the thermal sublayer
Davletshin I.А.1
1Institute of Power Engineering and Advanced Technologies, Federal Research Center, Kazan Scientific Center of the Russian Academy of Sciences, Kazan, Russia
Email: davlet60@mail.ru
The heat-transfer coefficient was calculated from the Lyons integral using the two-layer model (thermal sublayer and turbulent flow core). To estimate the turbulent thermal conductivity, the Prandtl mixing length model was used. Under the accepted assumptions, the Lyons integral had a rather simple form. Numerical solution of the integral yielded the distribution of the heat transfer coefficient over parameter Resqrt(Pr)sqrt, which agrees well with the Dittus-Boelter correlation for turbulent heat transfer. Keywords: Lyons integral, turbulent thermal conductivity, thermal sublayer, mixing length.
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