Show simple item record

dc.contributor.authorKim, Sung-Minen_US
dc.date.accessioned2008-06-10T20:39:50Z
dc.date.available2008-06-10T20:39:50Z
dc.date.issued2008-01-16en_US
dc.identifier.urihttp://hdl.handle.net/1853/22601
dc.description.abstractIn 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.en_US
dc.publisherGeorgia Institute of Technologyen_US
dc.subjectLaminaren_US
dc.subjectPulsating flowen_US
dc.subjectPorous mediaen_US
dc.subjectPermeability coefficienten_US
dc.subjectForchheimer coefficienten_US
dc.subjectPhase shiften_US
dc.subject.lcshLaminar flow
dc.subject.lcshPorous materials
dc.subject.lcshMomentum transfer
dc.subject.lcshMathematical models
dc.subject.lcshCompressibility
dc.titleNumerical investigation on laminar pulsating flow through porous mediaen_US
dc.typeThesisen_US
dc.description.degreeM.S.en_US
dc.contributor.departmentMechanical Engineeringen_US
dc.description.advisorCommittee Co-Chair: Dr. S. Mostafa Ghiaasiaan; Committee Co-Chair: Dr. S.I. Abdel-Khalik; Committee Member: Dr. Sheldon M. Jeteren_US


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record