Optimized electrode arrangement in solar air heater
Optimized electrode arrangement in solar air heater
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DOI：
10.1016/j.renene.2005.04.014
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发表时间：
2006-04
期刊：
影响因子：
8.7
通讯作者：
N. Kasayapanand;T. Kiatsiriroat
中科院分区：
文献类型：
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作者：
N. Kasayapanand;T. Kiatsiriroat
采用电流体力学方法，对不同导线电极布置形式的太阳能空气加热器内部层流强迫对流强化传热进行了数值研究。电场是由带电7.5 ~ 17.5kV直流高压的线电极产生的。所考虑的流动所对应的雷诺数在100 ~ 2000之间。计算流体力学的数值模拟包括电场、流场和温度场之间的相互作用。研究发现，电场的存在对换热系数的增强作用随供电电压的增大而增大，但随着雷诺数和电极与通道表面距离的增大而减小。在考虑压降的情况下，对获得最佳传热强化效果的电极优化布置进行了研究。传热增强还取决于每长度电极的数量和通道尺寸。
Laminar forced convection inside the solar air heater with various wire electrode arrangements are numerically examined for heat transfer enhancement using electrohydrodynamic technique. The electric field is generated by the wire electrodes charged with DC high voltage ranging from 7.5 to 17.5kV. Reynolds number corresponding to the flow considered is between 100 and 2000. The numerical modeling of computational fluid dynamics includes the interactions among electric field, flow field, and temperature field. It is found that the enhancement of heat transfer coefficient with the presence of electric field increases in relation with the supplied voltage but decreases when the Reynolds number and the distance between electrode and channel surface are augmented. The optimized electrode arrangement, which obtains the best heat transfer enhancement is investigated incorporating with the pressure drop consideration. The heat transfer enhancement is also depended on the number of electrodes per length and the channel dimension.