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

随着MEMS技术在CPU等电子器件领域的迅速发展，微纳尺度的相变现象和冷却技术显得尤为重要。因此，为了实现冷凝换热的强化，需要制作功能化的换热表面。为了去除生长的液滴，制备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的滴状冷凝中，换热系数是由离开液滴的尺寸决定的。实验结果表明，混合冷凝表面的换热系数大于膜状冷凝换热系数。

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.