A study of the critical impingement frequency of fluid in curved pipes for piston applications

Q. Wang*, Y. Cao, A. Velasquez

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution


A new engine piston incorporating heat pipe cooling technology is under development for improved thermal-tribological. performance. Due to the particular structure of the engine piston, curved heat pipes should be employed. The objective of this paper is to study fluid impingement inside curved pipes for curved heat pipe design. Experimental studies of fluid impingement using different curved transparent pipes are performed on an engine-heat pipe apparatus to determine the correlation between the heat pipe design parameters and minimum cranking frequency, or critical impingement frequency. Experimental results show that pipe curvature has little influence on the critical impingement frequency if the non-dimensional offset value of curved pipes is less than 0.3. The critical impingement frequency is higher for the pipe with a longer length and smaller diameter. The liquid charge level should be more than 30% of the pipe volume to avoid any negative effect of the pipe curvature on the heat pipe performance.

Original languageEnglish (US)
Title of host publicationInternational Congress and Exposition
StatePublished - Dec 1 1996
EventInternational Congress and Exposition - Detroit, MI, United States
Duration: Feb 26 1996Feb 29 1996


OtherInternational Congress and Exposition
Country/TerritoryUnited States
CityDetroit, MI

ASJC Scopus subject areas

  • Automotive Engineering
  • Safety, Risk, Reliability and Quality
  • Pollution
  • Industrial and Manufacturing Engineering


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