Numerical investigation on laminar pulsating flow through porous media.
Degree: MS, Mechanical Engineering, 2008, Georgia Tech
In this investigation, the flow friction associated with laminar pulsating flows through porous media was numerically studied. The problem is of interest for understanding the regenerators of Stirling and pulse tube cryocoolers. Two-dimensional flow in a system composed of a number of unit cells of generic porous structures was simulated using a CFD tool, with sinusoidal variations of flow with time. Detailed numerical data representing the oscillating velocity and pressure variations for five different generic porous structure geometries in the porosity range of 0.64 to 0.84, with flow pulsation frequency of 40 Hz were obtained, and special attention was paid to the phase shift characteristics between the velocity and pressure waves. Based on these detailed numerical data, the standard unsteady volume-averaged momentum conservation equation for porous media was then applied in order to obtain the instantaneous as well as cycle-averaged permeability and Forchheimer coefficients. It was found that the cycle-averaged permeability coefficients were nearly the same as those for steady flow, but the cycle-averaged Forchheimer coefficients were about two times larger than those for steady flow. Significant phase lags were observed with respect to the volume-averaged velocity and pressure waves. The parametric trends representing the dependence of these phase lags on porosity and flow Reynolds number were discussed. The phase difference between pressure and velocity waves, which is important for pulse tube cryocooling, depended strongly on porosity and flow Reynolds number.
Advisors/Committee Members: Dr. S. Mostafa Ghiaasiaan (Committee Co-Chair), Dr. S.I. Abdel-Khalik (Committee Co-Chair), Dr. Sheldon M. Jeter (Committee Member).
Subjects/Keywords: Laminar; Pulsating flow; Porous media; Permeability coefficient; Forchheimer coefficient; Phase shift; Laminar flow; Porous materials; Momentum transfer; Mathematical models; Compressibility
to Zotero / EndNote / Reference
APA (6th Edition):
Kim, S. (2008). Numerical investigation on laminar pulsating flow through porous media. (Masters Thesis). Georgia Tech. Retrieved from http://hdl.handle.net/1853/22601
Chicago Manual of Style (16th Edition):
Kim, Sung-Min. “Numerical investigation on laminar pulsating flow through porous media.” 2008. Masters Thesis, Georgia Tech. Accessed August 15, 2020.
MLA Handbook (7th Edition):
Kim, Sung-Min. “Numerical investigation on laminar pulsating flow through porous media.” 2008. Web. 15 Aug 2020.
Kim S. Numerical investigation on laminar pulsating flow through porous media. [Internet] [Masters thesis]. Georgia Tech; 2008. [cited 2020 Aug 15].
Available from: http://hdl.handle.net/1853/22601.
Council of Science Editors:
Kim S. Numerical investigation on laminar pulsating flow through porous media. [Masters Thesis]. Georgia Tech; 2008. Available from: http://hdl.handle.net/1853/22601