Inertance Tube and Reservoir Modeling: Meshing, Convergence and Friction Factors for Oscillating Flow
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Pulse tube refrigerators (PTRs) have made dramatic improvements in reliability, efficiency and usage, with the addition of the inertance tube helping to create the improvements. The combination of the inertance tube and reservoir help to create a phase shift between mass flow rate and pressure that affects the fluid dynamics in the PTR. Current models inadequately predict (in accuracy) the phase shifts in these oscillating refrigerators. Various modeling techniques have yet to address the issue of numerical solution convergence, especially with respect to the mesh size and time step size when using Computational Fluid Dynamics (CFD) models. This study aims to address the issue based on comparisons to a set of experimental results. Along with the CFD correlation, a comparison with a distributed inertance tube model based on new friction factors for oscillating flow will be reported. A comparison of isothermal to mixed surface wall boundary condition is performed.