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Title: Couple stress fluids in squeeze film flows
Researcher: Sumathi G
Guide(s): Vimala Manivasakan
Keywords: Axisymmetric, squeeze film mechanism, stress fluid, MATLAB
Upload Date: 15-Jan-2014
University: Anna University
Completed Date: 
Abstract: The thesis attempts to theoretically analyse the axisymmetric laminar squeezing flow of an incompressible couple stress fluid between parallel disks in curved circular, annular, porous circular and porous annular geometries. In order to increase the accuracy of hydrodynamic lubrication, the study considers some of the usually neglected forces like the local and convective fluid inertia and non-linear couple stresses. The squeeze film flow problem in a curved circular geometry is analysed using modified lubrication theory and energy integral method. The thesis also analyses the squeeze film flow problem in an annular geometry using modified lubrication theory and studies the individual and combined effects of inertia forces and couple stresses on the squeeze film characteristics. The analytical expressions for the squeeze film pressure and force are obtained in each case and numerical results are presented in the form of graphs using MATLAB. From the various squeeze film problems considered in the thesis, it is observed that the fluid inertia forces and couple stresses play a significant role in squeeze film mechanisms. It is also observed that the viscosity dependence on pressure strongly influence the squeeze film behaviour. In the case a of curved circular geometry, use of a concave disk is highly recommended due to better squeeze film performance when compared to flat and convex disks. Use of porous facings reduces the wear and tear on the moving parts without the necessity for frequent replacement of the lubricant fluid and thus many machines include porous facings for longer life of the parts and the lubricants. Although the load carrying capacity is not significantly high in porous squeeze films, the same is enhanced by the use of suitable couple stress fluids as lubricants. On the whole, the couple stress fluid model is found to be well suited for hydrodynamic lubrication and the effects of couple stresses improve the performance of lubrication processes. newline newline newline
Pagination: xviii, 147
Appears in Departments:Faculty of Science and Humanities

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01_title.pdfAttached File50.74 kBAdobe PDFView/Open
02_certificates.pdf513.74 kBAdobe PDFView/Open
03_abstract.pdf13.33 kBAdobe PDFView/Open
04_acknowledgement.pdf15.5 kBAdobe PDFView/Open
05_contents.pdf61.08 kBAdobe PDFView/Open
06_chapter 1.pdf85.89 kBAdobe PDFView/Open
07_chapter 2.pdf253.96 kBAdobe PDFView/Open
08_chapter 3.pdf209.69 kBAdobe PDFView/Open
09_chapter 4.pdf101.79 kBAdobe PDFView/Open
10_chapter 5.pdf128.01 kBAdobe PDFView/Open
11_chapter 6.pdf117.73 kBAdobe PDFView/Open
12_chapter 7.pdf124.85 kBAdobe PDFView/Open
13_references.pdf39.13 kBAdobe PDFView/Open
14_publications.pdf15.71 kBAdobe PDFView/Open
15_vitae.pdf13.69 kBAdobe PDFView/Open

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