Abstract
Convective heat transfer in microchannels of two-stage Y-branch bifurcation structures at different inlet velocities and branch angles were simulated, and the temperature, static pressure drop as well as the relationship between Reynolds Number (Re) and Nusselt Number (Nu) of fluid were compared and analyzed. The results indicate that the flow in microchannels with 30° branch angle has the minimum pressure drop for the velocities from 0.5 m/s to 2.5 m/s, while it comes at 60° for the velocities from 2.5 m/s to 3.5 m/s. It can also be found that the laminar-turbulent transition comes in advance compared with the common round channels. The critical Reynolds Number is found to be in 1997-2224, which is smaller than the known value of 2300. The Nu increases with increasing Re with a same trend for the different branch angles.
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