Estimation of cavitation limits from local head loss coefficient

Sánchez Calvo, Raúl and Juana Sirgado, Luis and Laguna Peñuelas, Francisco and Rodríguez Sinobas, Leonor (2008). Estimation of cavitation limits from local head loss coefficient. "Journal of Fluids Engineering", v. 130 (n. 10); pp. 101302-1. ISSN 0342-7188. https://doi.org/10.1115/1.2969453.

Description

Title: Estimation of cavitation limits from local head loss coefficient
Author/s:
  • Sánchez Calvo, Raúl
  • Juana Sirgado, Luis
  • Laguna Peñuelas, Francisco
  • Rodríguez Sinobas, Leonor
Item Type: Article
Título de Revista/Publicación: Journal of Fluids Engineering
Date: October 2008
ISSN: 0342-7188
Volume: 130
Subjects:
Freetext Keywords: local head losses, cavitation, valve, orifice, pipeline design.
Faculty: E.T.S.I. Agrónomos (UPM) [antigua denominación]
Department: Ingeniería Rural [hasta 2014]
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

Cavitation effects in valves and other sudden transitions in water distribution systems are studied as their better understanding and quantification is needed for design and analysis purposes and for predicting and controlling their operation. Two dimensionless coefficients are used to characterize and verify local effects under cavitating flow conditions: the coefficient of local head losses and the minimum value of the cavitation number. In principle, both coefficients must be determined experimentally, but a semianalytical relationship between them is here proposed so that if one of them is known, its value can be used to estimate the corresponding value of the other one. This relationship is experimentally contrasted by measuring head losses and flow rates. It is also shown that cavitation number values, called cavitation limits, such as the critical cavitation limit, can be related in a simple but practical way with the mentioned minimum cavitation number and with a given pressure fluctuation level. Head losses under conditions of cavitation in sharp-edged orifices and valves are predicted for changes in upstream and downstream boundary conditions. An experimental determination of the coefficient of local head losses and the minimum value of the cavitation number is not dependent on the boundary conditions even if vapor cavity extends far enough to reach a downstream pressure tap. Also, the effects of cavitation and displacement of moving parts of valves on head losses can be split. A relatively simple formulation for local head losses including cavitation influence is presented. It can be incorporated to water distribution analysis models to improve their results when cavitation occurs. Likewise, it can also be used to elaborate information about validity limits of head losses in valves and other sudden transitions and to interpret the results of head loss tests.

More information

Item ID: 2851
DC Identifier: http://oa.upm.es/2851/
OAI Identifier: oai:oa.upm.es:2851
DOI: 10.1115/1.2969453
Official URL: http://asmedl.aip.org/Fluids
Deposited by: Memoria Investigacion
Deposited on: 14 Apr 2010 10:02
Last Modified: 20 Apr 2016 12:29
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