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.
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.