This workshop on Vacuum Gas Dynamics, is organized in recognition of advances in the design and understanding of gas flow in vacuum systems. The problem of free molecular flow is always significant. Work has now extended to transition and viscous gas flow in higher pressure processing systems, and in turbo-molecular pumping. The pressure range extends at least from hard vacuum to 100 Torr. Microfluidics present a vacuum environment at high pressure. While applications are diverse, it is thought that scientists and engineers working on gas flow problems need the opportunity to meet and discuss their problems.
From the standpoint of modeling, Vacuum Gas Dynamics may be considered as an isothermal subset of Rarefied Gas Dynamics in ducts, with an emphasis on physical interpretation and simple analytic models, supported by DSMC and CFD calculations. The isothermal property applies over the cross section of the duct. At the University level, this subject falls on the boundary between Fluid Mechanics and the Aerospace Depts. and is often neglected.
One of the greater benefits of a conference on this subject will be to stimulate experimental work that will guide the development of models.