Experimental investigation on the heat transfer enhancement of wall modification inside a piston cooling gallery

ABSTRACT

Combined with visualization experiments, a square cavity reciprocating oscillation system is built based on CA6110 diesel engine to study heat transfer enhancement mechanism and explore a more efficient cooling method. Influences of liquid fill ratio, engine speed, and surface property on flow pattern and heat transfer characteristics are studied. Four surfaces are prepared. Results show that heat transfer performs the best with 50% liquid fill ratio and it is improved with increasing engine speed. Polished surface performs the worst, then super-hydrophilic surface and microstructure surface perform better, and microstructure super-hydrophilic surface performs the best with an 66% increase of average heat transfer coefficient.

KEYWORDS:

• Piston cooling gallery
• reciprocating oscillation
• microstructure surface
• super-hydrophilic property
• heat transfer enhancement

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Acknowledgments

This work is supported by the National Natural Science Foundation of China, China (Grant No. 52106226, 51876027, 51806028, and 52176058) and Fundamental Research Funds for the Central Universities, China (DUT20RC(3)095 and DUT20JC21).

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This work was supported by the National Natural Science Foundation of China [52106226, 51876027, 51806028, and 52176058]; Fundamental Research Funds for the Central Universities [52106226, 51876027, 51806028 and 52176058,DUT20RC(3)095 and DUT20JC21]; Fundamental Research Funds for the Central Universities, China [DUT20RC(3)095 and DUT20JC21]; National Natural Science Foundation of China, China [52106226, 51876027, 51806028, and 52176058].