Nucleate pool boiling heat transfer above laser machining heating surfaces with different micro-cavity geometric shape for water-aluminum oxide nanofluid

ABSTRACT

The present paper reports the experimental investigation of nucleate pool boiling heat transfer above heating surface with the creation of new geometric micro-cavities. Cylindrical, cubic, and pentagonal micro-cavities created on heating surface were studied. Micro-cavity surfaces were fabricated using a fiber laser machine. The heat transfer coefficient (HTC) of the heating surfaces were estimated experimentally by using pure water and water–Al₂O₃ nanofluid. The results showed that by creating geometrical micro-cavity on the heating surface, a maximum improvement of 83%–123.4% was obtained when using pure water. At a concentration of 0.005 vol.% nanofluid, the HTC increased by 95.2%–140.5% for different micro-cavities.

KEYWORDS:

• Pool boiling
• nanofluid
• micro-cavity
• enhancement

Disclosure statement

The authors declared that there is no conflict of interest.

Highlights

• Enhancement nucleate pool boiling heat transfer by creating a new geometric micro-cavity on the heating surface using laser Machining.

• In this investigation, different geometric micro-cavity created on the tested heating surface for boiling pure water as well as the effect of adding Al₂O₃ nanoparticles to water above newly test surfaces.

• Laser surface modification creates surface micro-fins and pores that helping in increasing the nucleation sites.

• The nucleate pool boiling heat transfer increased with pure water boiled above newly created heating surfaces. In addition, the enhancement percentage increased more by adding Al₂O₃ nanoparticles to water above the newly heating surface.

Correction Statement

This article has been republished with minor changes. These changes do not impact the academic content of the article.