This Brief presents an up to date summary of details of the flow boiling heat transfer, pressure drop and instability characteristics; two phase flow patterns of expanding microchannels. Results obtained from the different expanding microscale geometries are presented for comparison and addition to that, comparison with literatures is also performed. Finally, parametric studies are performed and presented in the brief. The findings from this study could help in understanding the complex microscale flow boiling behavior and aid in the design and implementation of reliable compact heat sinks for practical applications.

Explains the effect of expanding microchannel geometries on flow boiling instabilities and hotspot mitigation; Improves fundamental understanding of flow boiling behavior in microscale geometries; Performs parametric studies with systematic high speed visualizations; Presents an evaluation of the effect of expanding microchannel heat sink for scaled up geometries.

Autorentext

Poh-Seng Lee is Associate professor in the Department of Mechanical Engineering, at the National University of Singapore, Singapore.

Tamanna Alam is a Post-doctoral research fellow in the Department of Mechanical Engineering, University of South Carolina, SC, USA.

Inhalt

Introduction.- Flow Boiling Heat Transfer and Pressure Drop Characteristics in Expanding Microgap Channel.- Flow Boiling Instabilities in Expanding Microgap Channel.- Flow Boiling Heat Transfer, Pressure Drop and Instabilities in Straight and Expanding (Sloping Fin) Microchannels - A Comparative Study.- Flow Boiling Performance in Scaled Up Expanding Channel Geometries: Stepped Fin Minichannels.- Closure.