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  • Engineering  (2)
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  • 1
    Online Resource
    Online Resource
    Cavitation and head loss characteristics in nonsymmetric bifurcations
    Wiley ; 2014
    In:  Journal AWWA Vol. 106, No. 6 ( 2014-06)
    Details
    In: Journal AWWA, Wiley, Vol. 106, No. 6 ( 2014-06)
    Abstract: Nonsymmetric bifurcations, commonly used in piping systems to divert flow from one pipe to another, see considerable use in hydroelectric power applications and low‐level outlet works at dams. Under normal operation, cavitation at the bifurcation likely is not an issue; however, during emergency releases for dam safety or other extreme flows, the bifurcation must be able to safely pass the required flows without incurring damage attributable to cavitation. Although nonsymmetric bifurcations are widely used, the authors are unaware of any published data on related cavitation characteristics. The current study used computational fluid dynamics in conjunction with a physical model to predict conditions that would cause the onset of cavitation and to calculate head loss coefficients. Operating conditions are recommended that will allow bifurcations to operate within safe limits of cavitation. This study, although not exhaustive, provides previously unavailable data and can help designers and operators better understand the hydraulic performance of bifurcations.
    Type of Medium: Online Resource
    ISSN: 0003-150X , 1551-8833
    URL: Article
    DOI: 10.5942/jawwa.2014.106.0032
    RVK:
    ZM 1385
    Language: English
    Publisher: Wiley
    Publication Date: 2014
    detail.hit.zdb_id: 2144899-1
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    Online Resource
  • 2
    Online Resource
    Online Resource
    Computational Fluid Dynamics Investigation of Butterfly Valve Performance Factors
    Wiley ; 2015
    In:  Journal AWWA Vol. 107, No. 5 ( 2015-05)
    Details
    In: Journal AWWA, Wiley, Vol. 107, No. 5 ( 2015-05)
    Abstract: Experimental and simulated performance factors for a 48‐in.‐diameter butterfly valve were compared for various valve openings and flow conditions to determine the validity of using computational fluid dynamics (CFD) to predict butterfly valve performance factors such as pressure drop, hydrodynamic torque, flow coefficient, loss coefficient, and torque coefficient. Experimental data for the butterfly valve were obtained from the Utah Water Research Lab. Simulations were carried out on three‐dimensional models of the valve using general‐purpose CFD code STAR‐CCM+. Results show that for mid‐open valve positions (30–60 degrees), CFD adequately predicted butterfly valve performance factors. For lower valve‐angle cases (10–20 degrees), CFD simulations failed to reasonably predict those same values, while higher valve‐opening angles (70–90 degrees) gave mixed results. However, CFD simulations can provide engineers the ability to understand and predict valve performance, especially when laboratory testing may not be possible.
    Type of Medium: Online Resource
    ISSN: 0003-150X , 1551-8833
    URL: Article
    DOI: 10.5942/jawwa.2015.107.0052
    RVK:
    ZM 1385
    Language: English
    Publisher: Wiley
    Publication Date: 2015
    detail.hit.zdb_id: 2144899-1
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
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