Operating limitation of reciprocating heat pipes for piston cooling applications

Yiding Cao*, Qian Wang, Jian Ling

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

4 Scopus citations


The technological background of the reciprocating heat pipe (or shaking-up heat pipe) is described. Four reciprocating heat pipes with different geometrical dimensions are tested for the determination of the minimum reciprocal frequency of the heat pipe. The experimental results show that the minimum frequency is lower for a reciprocating heat pipe with a shorter length and larger diameter. Overall, the minimum frequency is essentially insensitive to the variation of heat pipe dimensions and power inputs. This means that the reciprocating heat pipe can be used for piston cooling without encountering any major working limitations. The experimental results also show that at a higher engine cranking speed, the effective thermal conductance of the reciprocating heat pipe is more than 130 times that of a copper bar having the same size as the heat pipe. This would rank the reciprocating heat as one of the best performers in various heat pipe applications, considering the small length of the reciprocating heat pipe. Finally, a reciprocating heat pipe without air evacuation is tested, which indicates that the contribution of the liquid impingement in the heat pipe is significant, and that this heat pipe works relatively well at a lower heat input.

Original languageEnglish (US)
Pages (from-to)235-241
Number of pages7
JournalAmerican Society of Mechanical Engineers, Heat Transfer Division, (Publication) HTD
StatePublished - 1995
EventProceedings of the 1995 ASME International Mechanical Congress and Exposition - San Francisco, CA, USA
Duration: Nov 12 1995Nov 17 1995

ASJC Scopus subject areas

  • Mechanical Engineering
  • Fluid Flow and Transfer Processes


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