ANALYTICAL STUDY OF THE EQUILIBRIUM THICKNESS OF BORIC OXIDE DEPOSITS ON JET-ENGINE SURFACES

摘要

An analytical study is presented of a laminar liquid film flowing along a surface immersed in a gas stream. The results of the analysis indicate that: (l) The equilibrium film thickness is directly proportional to the square root of the liquid deposition ratej (2) the equilibrium film thickness is directly proportional to the square root of the liquid viscosity; and (3) the equilibrium film thickness is inversely proportional to the square root of the shear stress at the surface.nThe results are intended to show the parameters affecting the thick¬ness of this film, but are not intended to be quantitative. A calculation made from the analysis does appear reasonable, however, when compared with the scant experimental data available. The analysis indicates that the equilibrium film thickness. will be less in regions of high liquid-film temperature (reduced viscosity) and high free-stream momentum.