Unveiling the fundamentals of flow boiling heat transfer enhancement on structured surfaces.

ABSTRACT: Micro- and nanostructured surfaces offer the potential to enhance two-phase heat transfer. However, the mechanisms behind these enhancements are not well-understood due to insufficient diagnostic methods, leading to reliance on trial-and-error surface development. We introduce in situ boroscopy to investigate microscale bubble dynamics during flow boiling nucleation and subsequent flow regime development. This method was applied in saturated flow boiling experiments within chemically etched aluminum and copper tubes. Although the surfaces have self-similar surface structures, our findings revealed varied heat transfer coefficient enhancements, with increases of up to 391% on aluminum and 41% on copper. Using boroscopy, we identified key mechanisms of heat transfer enhancement. We further u

SUBMITTER: Inanlu MJ 

PROVIDER: S-EPMC11546817 | biostudies-literature | 2024 Nov

REPOSITORIES: biostudies-literature