Numerical Study on the Fluid Flow and Heat Transfer Characteristics of Al2O3-Water Nanofluids in Microchannels of Different Aspect Ratio

The study of the influence nanoparticle volume fraction and aspect ratio microchannels on fluid flow heat transfer characteristics nanofluids in is important optimal design dissipation systems with high flux. In this work, computational dynamics method was adopted to simulate two types water-Al2O3 different fractions five microchannel sinks ratios. Results showed that increasing reduced average temperature interface thereby improved capacity nanofluids. Meanwhile, increase led a considerable pumping power system. Increasing effectively sink. Moreover, heating surface sink without significantly resistance loss. When exceeded 30, coefficient did not ratio. results work may offer guiding significance for flux sinks.