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Enhancement of Flow Boiling Heat Transfer by Laser-induced Periodic Surface Structures Using Femtosecond Laser by Kihoon Lim; Keunhee Lee; Hyungson Ki; Jaeseon Lee is a Engineering article available to read on EtoBox.

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This study proposes a new surface processing method using a femtosecond laser to enhance the flow boiling heat transfer in a single mini/micro-channel duct. The suggested method is suitable for mini/micro-channel surface processing because the femtosecond laser with a short pulse duration (∼220 femtoseconds) simplifies the fabrication procedure and minimizes the thermal damage of surfaces during laser processing. Three types of laser-induced surfaces different in the nano-surface structure were fabricated. Three surfaces include laser-induced periodic surface structure (LIPSS), micro-groove covered clustered cavity by low fluence (MGCC-LF), and micro-groove covered clustered cavity by high fluence (MGCC-HF). Flow boiling heat transfer of each surface was experimentally investigated through a comparison with that of the plain copper surface in single-channel experiments. Experimental results demonstrated that LIPSS enhanced the boiling heat transfer by increasing the bubble nucleation sites with a self-organized nanosized ripple structure. Consequently, the MGCC-HF surface with nanosized clustered cavities and hydrophilic characteristics has the most prominent flow boiling heat tran

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Author

Kihoon Lim; Keunhee Lee; Hyungson Ki; Jaeseon Lee

Publisher

Elsevier BV

Published

2022

Language

EN

Field

Engineering (Physical Sciences)