Influence of Layer-thickness-to-particle-size ratio on boiling performance of sintered microchannels
The problem of heat dissipation in electronics apparatus of marine has been of great concern.The subcooled flow boiling experiment was conducted to study the effect of layer thickness on boiling heat transfer performance.The paral-lel microchannels were sintered with two kinds of dendritic-like copper powders with diameters of 30 μm and 90 μm,which the layer thickenss varies from 100 μm to 1 000 μm.It is found that there exists an optimal layer thickness for each particle size,which can greatly suppress pressure and temperature pulsation,and achieve the best boiling heat transfer effect,which means that there exists an optimal layer-thickness-to-particle-size ratio range for sintering microchannels.The particle size effect also plays an independent role,and the 90 μm series show better performance than the 30μm series.Samples with too large or too small layer thickness often leads to explosive boiling and serious obstruction of liquid supply.The optimum lay-er thickness can greatly inhibit pressure and temperature pulsation and achieve the best boiling heat transfer effect.The op-timum optimal layer-thickness-to-particle-size ratio range between 3.0～7.0.
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