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Dispersion in Steady Pipe Flow with Reynolds Number Under 10,000

Cutter, Matthew R.
http://rave.ohiolink.edu/etdc/view?acc_num=ucin1093008636

Abstract Details

2004, MS, University of Cincinnati, Engineering : Environmental Engineering.
The longitudinal dispersion coefficient of a conservative tracer (CaCl2) was calculated from continuous flow tests in a dead-end pipe system. The system consisted of 6-inch diameter PVC pipe with a test length of approximately 44 meters. Flow conditions ranged from laminar to turbulent regimes, with a Reynolds number range of 1000 to 10000. Two static mixers in series were used to homogenize the tracer concentration across the cross-section of pipe. The conductivity of the tracer was measured at two locations downstream of the injection and mixers using a conductivity probe at a point in the cross-section. Dispersion coefficients calculated by the method of moments are plotted versus Reynolds number. Test results show increasing time-averaged dispersion rate in the laminar flow regime and a portion of the transitional flow regime with increasing Reynolds number. At a flow rate corresponding to a Reynolds number (Re) of approximately Re=2400, the dispersion rate reaches a maximum value and then decreases until approximately Re=4000. As the tests enter the turbulent flow regime, the dispersion rate is minimized due to the plug-flow behavior inherent to turbulent flow. Results indicate that dispersion plays a more important role in mass transport in laminar and transitional flow than advective mass transport. Incorporating dispersion estimates into network water quality models will improve quality predictions for the dead-end portions of the network.
Dr. Steven Buchberger (Advisor)
187 p.
Engineering, Environmental
longitudinal dispersion coefficient; tracer; laminar; water distribution network; dead-end; simulator

Recommended Citations

Citations

  • Cutter, M. R. (2004). Dispersion in Steady Pipe Flow with Reynolds Number Under 10,000 [Master's thesis, University of Cincinnati]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1093008636

    APA Style (7th edition)

  • Cutter, Matthew. Dispersion in Steady Pipe Flow with Reynolds Number Under 10,000. 2004. University of Cincinnati, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ucin1093008636.

    MLA Style (8th edition)

  • Cutter, Matthew. "Dispersion in Steady Pipe Flow with Reynolds Number Under 10,000." Master's thesis, University of Cincinnati, 2004. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1093008636

    Chicago Manual of Style (17th edition)

ucin1093008636
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© 2004, all rights reserved.
This open access ETD is published by University of Cincinnati and OhioLINK.