Pahk, Jae Bum
(2007)
Experimental study of pneumatic conveying by various methods of analysis.
Doctoral Dissertation, University of Pittsburgh.
(Unpublished)
Abstract
Pneumatic transport of solids is widely used due to many of its advantages. Many studies have been carried out to explore the details of the transport of solids with pneumatic conveying with the aim to develop enhanced operations. The flow pattern seen in pneumatic conveying can vary widely depending on the gas velocity, the solid feed rate and the characteristics of the solid. In this study a deeper understanding of the interactions of the parameters has been explored using classical signal analysis of pressure fluctuations.Experiments on dilute phase pneumatic transport were performed using polyester, polystyrene, and polyolefin pellets. Material properties such as mean diameter of polymer pellets and density of each polymer have been determined. The parameters of gas velocity and the solid loading ratio were varied producing the distinct pressure gradients which were measured at three different locations: vertical, lower and upper horizontal sections of the piping arrangement. Using these data, a phase space analysis, a power spectral density (PSD) analysis, a fractal dimension analysis, and a rescaled range analysis with Hurst¡¯s exponents were carried out to try to develop means to identify the flow conditions using simple pressure transducers. By taking a high speed video of the flow process through the transparent section in the pipe, the flow pattern was visually observed and unique dynamics were seen for the polyolefin particles. Furthermore, by using a wavelet analysis to decompose the original signal, noting the contributions due to the blower and feeder, the flow - pressure fluctuation yielded information about details of the particle-gas interaction.
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Details
| Item Type: |
University of Pittsburgh ETD
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| Status: |
Unpublished |
| Creators/Authors: |
|
| ETD Committee: |
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| Date: |
31 January 2007 |
| Date Type: |
Completion |
| Defense Date: |
4 October 2006 |
| Approval Date: |
31 January 2007 |
| Submission Date: |
27 November 2006 |
| Access Restriction: |
No restriction; Release the ETD for access worldwide immediately. |
| Institution: |
University of Pittsburgh |
| Schools and Programs: |
Swanson School of Engineering > Mechanical Engineering |
| Degree: |
PhD - Doctor of Philosophy |
| Thesis Type: |
Doctoral Dissertation |
| Refereed: |
Yes |
| Uncontrolled Keywords: |
bulk material; dilute phase; Hurst's exponent; phase space; pneumatic conveying; power spectrum; wavelet |
| Other ID: |
http://etd.library.pitt.edu/ETD/available/etd-11272006-165136/, etd-11272006-165136 |
| Date Deposited: |
10 Nov 2011 20:06 |
| Last Modified: |
15 Nov 2016 13:52 |
| URI: |
http://d-scholarship.pitt.edu/id/eprint/9808 |
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