Can LED lights replace lasers for detailed investigations of boiling phenomena?

Capturing the dynamics of triple contact line at base a vapor bubble is crucial to development and validation boiling heat transfer crisis models. To this end, laser-based techniques are state-of-the-art. However, they have technical limitations, e.g., due presence parasite interference patterns or laser speckle, often complicated implement operate. In paper, we propose discuss rationale alternative phase detection based on LED lights. Colored lights coherence length several micrometers, which long enough create when reflected by microlayer short prevent formation caused lasers. We show that, even with simple optical setup, these LED-based can images superior quality uniformity, making it possible resolve smaller features, size shape footprint high-pressure conditions. Moreover, much less expensive, safer, easier operate than lasers, an obvious advantage for researchers that want either enter field expand their measurement capabilities. demonstrate use potential experimental results obtained in subcooled flow water, both ambient also how technique be combined infrared thermometry study evaporation microlayer, other mechanisms associated growth departure bubble, flux partitioning over entire surface.