On the effect of corrugated conical frustum on pool boiling heat transfer.

• Hollow Conical Frustum was used to ameliorate pool boiling heat transfer. • Heat transfer coefficient enhancement of 19.8% in stationary mode was obtained. • Heat transfer coefficient enhancement of 1302 % in rotating mode was obtained. • There is an optimum heat flux at which the maximum PBHTC occurs in rotating mode. • There is an optimum distance between the conical frustum and the boiling surface. Pool boiling heat transfer as a promising heat transfer mechanism that can provide ample heat dissipation for thermal management applications has been granted much attention. This study puts forward the idea of applying an Inner Corrugated Hollow Conical Frustum (ICHCF) to ameliorate pool boiling heat transfer. The performance of the ICHCF is experimentally investigated for both the stationary and rotating cases. Furthermore, the effect of various geometrical parameters such as the ICHCF height, thread depth, thread pitch, the gap between the ICHCF and boiling surface, and the rotational speed of the ICHCF are studied. Twelve different ICHCFs were fabricated and tested for the purpose of this study. The obtained results demonstrated that increasing the ICHCF height enhances the pool boiling heat transfer coefficient (PBHTC). It was also observed that there is an optimum distance between the conical frustum and the boiling surface. The results also revealed that using smaller pitches and higher thread depths can further improve the PBHTC. The PBHTC enhancement of up to 19.8 % in stationary and 1302 % in rotating modes was obtained compared to a plain surface. [ABSTRACT FROM AUTHOR]