Abstract
The present paper gives a theoretical outline on liquid film flows driven by superimposed effects of interfacial shear and gravity forces and discusses related heat transfer processes which are relevant for lubrication oil systems of aero engines. It is shown that a simple analytical approach is able to predict measured heat transfer data fairly well. Therefore, it offers scope for improvements within the analysis of bearing chamber heat transfer characteristics as well as for appropriate studies with respect to other components of the lubrication oil system such as vent pipeline elements.
Highlights
An efficient secondary air/lubrication oil system is an important demand for further improvements of performance characteristics and capabilities of modern jet engines
As it has already been expressed by Eq (2), a further analysis of heat transfer processes has to be based on an assumption for the heat flux in radial direction and requires a correlation for the turbulent Prandtl number
Based on a comparison with measured data, typical representatives of existing models for the calculation of liquid film flows have been assessed for their potential on heat transfer predictions across bearing chamber oil film flows
Summary
UTRC, CT 06108 East Hartford, USA; Lehrstuhl und Institut fft’r Thermische Str6mungsmaschinen, Universitgit Karlsruhe (TH), D-76128 Karlsruhe, Germany (Received in final form 11 April 1997). The present paper gives a theoretical outline on liquid film flows driven by superimposed effects of interfacial shear and gravity forces and discusses related heat transfer processes which are relevant for lubrication oil systems of aero engines. It is shown that a simple analytical approach is able to predict measured heat transfer data fairly well. It offers scope for improvements within the analysis of bearing chamber heat transfer characteristics as well as for appropriate studies with respect to other components of the lubrication oil system such as vent pipeline elements. Keywords." Bearing chamber, Heat transfer, Film thickness, Velocity profile, Shear driven, Gravity
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