Study on Fabrication of Hydrophobic and Hydrophilic Micro-structured Condensing Surface and Enhancement of Condensation Heat Transfer

随着微机电系统（MEMS）技术在微处理器等电子器件领域的迅速发展，微纳相变现象和冷却技术显得尤为重要。因此，为了实现强化凝结换热，需要对换热表面进行功能化处理。为了去除生长的液滴，制造了具有疏水和亲水图案的混合冷凝表面。这是因为在疏水表面上的滴状冷凝中，传热系数由离开的液滴尺寸决定。实验结果表明，混合冷凝表面的换热系数比膜状冷凝表面的换热系数大。

The micro- and nano- scale phase change phenomena and cooling technology are more important because the MEMS technology develops rapidly in the fields of electro- devices such as CPU. Therefore, the functionalized heat transfer surface is made in order to realize the enhancement of condensation heat transfer. The hybrid-condensing surface with hydrophobic and hydrophilic patterns is fabricated in order to remove the grown droplets. This is because in the dropwise condensation on the hydrophobic surface, the heat transfer coefficient is determined by the departing droplet size. In experimental results, the heat transfer coefficients on the hybrid-condensing surface show the larger value than the filmwise condensation heat transfer.