The purpose of this experimental investigation is to measure the isothermal steady flow of Helium through a rectangular microchannel from the continuum to the free-molecular regime. The intention is to expand the measured Knudsen number range for rectangular cross section microchannels as compared with that presently found in in the literature. As presented, the Knudsen range for the experiments is 0.03 to overnearly 500. A dual tank accumulation technique was chosen for flow measurements which allows for very low flow rate measurements (<\u301610\u3017^(-13) kgs^(-1)). Experimental results were evaluated against analytical solutions for the continuum, slip, and free molecular regimes as well as a closed-form equation that would include any regime. Data was also compared to computer models using the Direct Simulation Monte Carlo method.
Helium--Fluid dynamics, Free molecular flow, Microreactors.
Level of Degree
First Committee Member (Chair)
Second Committee Member
Sandia National Laboratories
Anderson, John. "Isothermal helium flow measurements twrough a rectangular channel for a Wide Knudsen range." (2012). https://digitalrepository.unm.edu/me_etds/57