Dynamic modeling and analysis of the different cavity-type hydrostatic slide turntable system
In this paper, a nonlinear oil-film force model with velocity term for hydrostatic slide system with rectangular, sector and round chamber is established respectively, by eliminating the small amount after the dimensional analysis with the help of Navier-Stokes equation, and combining with the oil-film bearing model of Hydrostatic Slide System of constant oil supply. And the turntable dynamic equations of hydrostatic slide system with different chambers are formulated consequently. Furthermore, the analysis of dynamics properties of the hydrostatic slide turntable with the same oil chamber area is investigated by numerical simulation. This research provide theoretical bases of the further studying and improving of the rest aspects property of hydrostatic oil film-turntable system.
Nonlinear film-force of journal bearing
According to the limit pressure boundary condition of a journal bearing a reynolds equation can be changed to a 2nd order nonlinear differential equation,in which variables can be separated.The expression of the film force of limited length journal bearing can be obtained by integrating the equations set.The inertia co- efficient and squeeze coefficient are defined to express the inertia force and the squeeze force of the film force respectively.The film force can explain the mechanism for film force clearly and laid the foundation for further study of the dynamic characteristics of the nonlinear rotor bearing system.
Laminar heat or mass transfer in rectangular channels and in cylindrical tubes for fully developed flow: comparison of solutions obtained for various boundary conditions
Abstract A comparison is made of results obtained with various boundary conditions at the wall of the channels. By comparing blood Sherwood numbers for finite wall resistance with those for constant concentration boundary condition only a small variation is found for various points along the blood channel.