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Experimental study of pneumatic conveying by various methods of analysis

Pahk, Jae Bum (2007) Experimental study of pneumatic conveying by various methods of analysis. Doctoral Dissertation, University of Pittsburgh. (Unpublished)

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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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Item Type: University of Pittsburgh ETD
Status: Unpublished
CreatorsEmailPitt UsernameORCID
Pahk, Jae Bumjbp12@pitt.eduJBP12
ETD Committee:
TitleMemberEmail AddressPitt UsernameORCID
Committee ChairRobertson, Anne Mannerob@engr.pitt.eduRBERTSON
Committee ChairKlinzing, George Eklinzing@provost.pitt.eduKLINZING
Committee MemberLi, Ching-Chungccl@engr.pitt.eduCCL
Committee MemberGaldi, Giovanni Pgaldi@engr.pitt.eduGALDI
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:, etd-11272006-165136
Date Deposited: 10 Nov 2011 20:06
Last Modified: 15 Nov 2016 13:52


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