Experimental study on the effect of Tin-doped copper oxide capillary-porous surfaces on pool boiling heat transfer performance

• Published in: International communications in heat and mass transfer 2024-11, Vol.158, p.107928, Article 107928
• Main Authors: Gupta, Sanjay Kumar, Misra, Rahul Dev
• Format: Article
• Language: English
• Subjects: Critical heat flux; Heat transfer; Nanoporous; Pool boiling; Thin films
• ISSN: 0735-1933
• DOI: 10.1016/j.icheatmasstransfer.2024.107928

The novel tin-doped copper oxide capillary-nano-porous surfaces were created using the easy and affordable sol-gel method. The pool's boiling incipience wall superheat on a capillary-nano-porous surface was lower than a non-coating surface. Bubble flow visualization investigation demonstrates that the coating's shape can significantly affect the processes involved in improving heat transmission. An investigation of the nano-porous surface's long-term stability was conducted using water. Repeated cycles of studies on created nano-porous surfaces revealed a little divergence in wall superheat and surface shape. The present study's tin-doped copper oxide coated surface (Sn-CuO-600) has a higher CHF (critical heat flux) and HTC (heat transfer coefficient). Heat transmission by boiling rises when a substantial quantity of bubbles are rapidly evacuated from the heating exterior. It is observed that a greater quantity of tiny, spherical bubbles are continually growing on the superhydrophilic Sn-CuO-600 surface. Compared to the plain copper surface, the Sn-CuO-600 surface experiences a significant reduction in bubble departure times. The rate of bubble formation is increased by superhydrophilic surfaces, which also reduce bubble dimensions and release times. Consequently, the Sn-CuO-600 surfaces exhibit superior heat transfer ability throughout boiling. •Surface-to-surface adhesion of the generated capillary-porous films is a major challenge.•Unique type of Tin-doped copper oxide capillary-porous coatings were fabricated.•The stable capillary-porous thin films are produced.•Attained higher heat transfer coefficient and critical heat flux.•The proposed surfaces reflected as a potential applicant for cooling appliances.