This article presents saturated critical heat flux results in an aluminium heat sink at high saturation temperatures. The test section is made up of seven rectangular mini-channels that are 1.0 mm deep and 2.0 mm wide, with a heated length of 25 mm. R134a has been used as the working fluid. The effect of mass flux G (ranging from 150 up to 330 kg/m2 s) has been investigated. All tests have been performed at medium to high saturation temperatures, ranging from 25 °C up to 70 °C. The experimental results showed that the saturation temperature had only a mild influence on the CHF, at each mass flux imposed. On the contrary, when increasing the mass flux at a given saturation temperature, the critical heat flux was observed to increase significantly. Finally, the prediction capability of a well-known critical heat flux correlation has also been tested.
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