Experimental investigation of Sub-cooled flow boiling in metallic microchannel

Abstract EN

Experiments in microchannel heat sink were carried that examine the deionized water two-phase boiling heat transfer.

The heat sink consisted of a single microchannel having 300μm wide nominal dimensions and 300μm height (hydraulic diameter of 300μm).

The heat sink formed of oxygen-free copper with 72mm length and 12mm width.

Experimental operation conditions spanned the heat flux (78-800) kW/m2, mass flux (1700 and 2100) kg/m2.s at 31K subcooled inlet temperature.

The boiling heat transfer coefficient is measured, and compared with existing correlations.

The results show that higher mass flux leads to a higher boiling heat transfer coefficient and the dominants mechanism is convective boiling.

In addition, it was found that an existing correlation provides a satisfactory prediction of the heat transfer coefficient.