Flow boiling of water on nanocoated surfaces in a microchannel

TL;DR

This study investigates how different nanocoated surface wettabilities affect water flow boiling in a microchannel, revealing significant impacts on heat transfer efficiency under various conditions.

Contribution

It provides experimental insights into the influence of surface wettability on flow boiling heat transfer in microchannels, highlighting the effects of nanocoatings with different contact angles.

Findings

Surface wettability significantly affects heat transfer coefficients.

Higher contact angles generally improve boiling heat transfer.

Nanocoatings can be tailored to optimize microchannel cooling performance.

Abstract

Experiments were performed to study the effects of surface wettability on flow boiling of water at atmospheric pressure. The test channel is a single rectangular channel 0.5 mm high, 5 mm wide and 180 mm long. The mass flux was set at 100 kg/m2 s and the base heat flux varied from 30 to 80 kW/m2. Water enters the test channel under subcooled conditions. The samples are silicone oxide (SiOx), titanium (Ti), diamond-like carbon (DLC) and carbon-doped silicon oxide (SiOC) surfaces with static contact angles of 26{\deg}, 49{\deg}, 63{\deg} and 103{\deg}, respectively. The results show significant impacts of surface wettability on heat transfer coefficient.