Abstract
Vacuum spray flash evaporation cooling (VSFEC) experiments were carried out to study the effect of heat transfer enhancement of a nanofluid comprising distilled water and Al2O3 particles with a diameter of 30 nm. The tests are performed with a flat heated surface using a nozzle with an orifice diameter of 0.5 mm and a nozzle-to-heated surface distance of 7 mm. The spray volume flux is varied in the range of 1.7 L/h-5.0 L/h, while the concentration is specified as 0ppm, 100ppm, 200ppm, 300ppm or 500ppm. The experiment results show that a more uniform surface temperature can be obtained, however, due to the difference of heat transfer mechanism, the effect of heat transfer enhancement is also different using Al2O3–water nanofluid.
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