NOTE: This item is not available outside the Texas A&M University network. Texas A&M affiliated users who are off campus can access the item through NetID and password authentication or by using TAMU VPN. Non-affiliated individuals should request a copy through their local library's interlibrary loan service.
Simulation of bristle tip lift-off in a brush seal
| dc.creator | Modi, Sandeep Subhash | |
| dc.date.accessioned | 2012-06-07T22:41:50Z | |
| dc.date.available | 2012-06-07T22:41:50Z | |
| dc.date.created | 1995 | |
| dc.date.issued | 1995 | |
| dc.identifier.uri | https://hdl.handle.net/1969.1/ETD-TAMU-1995-THESIS-M63 | |
| dc.description | Due to the character of the original source materials and the nature of batch digitization, quality control issues may be present in this document. Please report any quality issues you encounter to digital@library.tamu.edu, referencing the URI of the item. | en |
| dc.description | Includes bibliographical references. | en |
| dc.description | Issued also on microfiche from Lange Micrographics. | en |
| dc.description.abstract | A computational procedure to simulate the bristle tip lift-off mechanism in a brush seal is established. This involves both macroscopic and microscopic modeling of the brush seal. A porous media model is used in the macroscopic view to estimate the average leakage velocity which serves as one of the boundary conditions for the microscopic model. The microscopic model consists of an arbitrary repeating module of 5 bristles arranged in a staggered fashion. The FIDAP program is used to model this flow domain and solve for the fluid forces on the central bristle. These forces are then integrated using Simpson's algorithm to calculate the bristle tip deflection and lift-off using a simple beam deflection formula. The deflection of the bristle tip represents a slight change of geometry of the domain. FIDAP then creates a computational grid for the new geometry and again solves for the fluid forces on the central bristle. Convergence is declared when the new lift-off is within a pre-specified percentage of the previous one. An enhanced understanding of two effects was obtained: (a) bristle angle effect and (b) bristle length effect. The results indicate that the lift-off gap is more sensitive to changes in bristle length than changes in bristle angle, which is in conformity with the theory. Specifically, the lift-off gap is found to increase linearly with bristle angle &-, well as bristle length. A very complex flow pattern was found in the vicinity of the bristle tips. This flow is very sensitive to changes in the bristle geometry. It is seen that the radial lifting force acting on the bristle tip is the dominant force causing the bristle tip lift-off. | en |
| dc.format.medium | electronic | en |
| dc.format.mimetype | application/pdf | |
| dc.language.iso | en_US | |
| dc.publisher | Texas A&M University | |
| dc.rights | This thesis was part of a retrospective digitization project authorized by the Texas A&M University Libraries in 2008. Copyright remains vested with the author(s). It is the user's responsibility to secure permission from the copyright holder(s) for re-use of the work beyond the provision of Fair Use. | en |
| dc.subject | mechanical engineering. | en |
| dc.subject | Major mechanical engineering. | en |
| dc.title | Simulation of bristle tip lift-off in a brush seal | en |
| dc.type | Thesis | en |
| thesis.degree.discipline | mechanical engineering | en |
| thesis.degree.name | M.S. | en |
| thesis.degree.level | Masters | en |
| dc.type.genre | thesis | en |
| dc.type.material | text | en |
| dc.format.digitalOrigin | reformatted digital | en |
Files in this item
This item appears in the following Collection(s)
-
Digitized Theses and Dissertations (1922–2004)
Texas A&M University Theses and Dissertations (1922–2004)
Request Open Access
This item and its contents are restricted. If this is your thesis or dissertation, you can make it open-access. This will allow all visitors to view the contents of the thesis.