Flow and convective heat transfer characteristics of the triangle micro pin fins (d=247 μm

H=500 μm) using de-ionized water as working fluid were experimentally investigated. The change rules of pressure drops

friction factors and Nusselt numbers etc. in triangular micro pin fins were measured when Reynolds number changed from 0—1000 with different heating power of 50

100 and 150W

respectively. In addition

the influence of heating power on flow resistance and convective heat transfer of triangular micro pin fins was analyzed. The experimental results illustrated that the friction factors of the triangle micro pin fins increase markedly with the increase of heating power at Re<250 and the increment of friction factors reached more than 200%

while the effect of heating power was significantly reduced at Re>250 and the value of f almost no longer changed with increasing heating power after Re>600. The convective heat transfer in triangular micro pin fins was enhanced by increasing heating power at Re<250 and the increment of Nusselt number at the same Re could reach more than 75%. However

this enhancement was weakened by the vertex evolution in wake zones of triangular micro pin fins and the Nu became smaller with the increase of heating power when Re>250.