Record number :
96213
Title of article :
An experimental study of convective heat transfer in silicon microchannels with different surface conditions
Author/Authors :
Cheng، Ping نويسنده , , Wu، H. Y. نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2003
Pages :
-2546
From page :
2547
To page :
0
Abstract :
An experimental investigation has been performed on the laminar convective heat transfer and pressure drop of water in 13 different trapezoidal silicon microchannels. It is found that the values of Nusselt number and apparent friction constant depend greatly on different geometric parameters. The laminar Nusselt number and apparent friction constant increase with the increase of surface roughness and surface hydrophilic property. These increases become more obvious at larger Reynolds numbers. The experimental results also show that the Nusselt number increases almost linearly with the Reynolds number at low Reynolds numbers (Re<100), but increases slowly at a Reynolds number greater than 100. Based on 168 experimental data points, dimensionless correlations for the Nusselt number and the apparent friction constant are obtained for the flow of water in trapezoidal microchannels having different geometric parameters, surface roughnesses and surface hydrophilic properties. Finally, an evaluation of heat flux per pumping power and per temperature difference is given for the microchannels used in this experiment.
Keywords :
Convective heat transfer , Hydrophilicity , Roughness , Microchannels
Journal title :
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
Journal title :
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
Serial Year :
2003
Link To Document :
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