EVALUATION OF UNSTEADY FLOW RESISTANCES BY QUASI-2D OR 1D MODELS. TECHNICAL NOTE

This note considers the evaluation of resistances in unsteady flow by means of a one-dimensional (1D) unsteady friction model. The model is applied for the case of a water hammer, both in a single gravity pipeline and in a single pumped pipeline. Comparisons with experimental results show that the model does not predict the exact shape of the oscillation, but it gives, with high precision, the maximums and minimums of the pressure head oscillation if correct values of the parameter of the model are used. Because experimental evaluations can be made only for a few cases and can give rise to very different values depending on experimental conditions, the sensitivity of the model to physical and numerical parameters that influence the phenomenon is examined by comparison with the results of a quasi-2D model previously proposed.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/oclc/8672558
• Corporate Authors:

  American Society of Civil Engineers

  1801 Alexander Bell Drive
  Reston, VA  United States  20191-4400
• Authors:
  • Pezzinga, G
• Publication Date: 2000-10

Language

• English

Media Info

• Features: Appendices; Figures; References;
• Pagination: p. 778-785
• Serial:
  • Journal of Hydraulic Engineering
  • Volume: 126
  • Issue Number: 10
  • Publisher: American Society of Civil Engineers
  • ISSN: 0733-9429
  • Serial URL: https://ascelibrary.org/journal/jhend8

Subject/Index Terms

• TRT Terms: Finite differences; Flow resistance; Friction; Mathematical models; Oscillations (Mathematics); Pipelines; Reynolds number; Roughness; Unsteady flow
• Subject Areas: Design; Pipelines; Terminals and Facilities;

Filing Info

• Accession Number: 00800609
• Record Type: Publication
• Files: TRIS
• Created Date: Oct 12 2000 12:00AM