Therefore, when the superheat is small, the boiling performance of each surface is basically the same. When the superheat is further increased, the boiling curves on the surfaces of NPD2, NPD3 and NPD4. The boiling enhancement on the surfaces of NPD2, NPD3 and NPD4 is due to the increase of nucleation sites and the improvement of surface wettability, as shown in Section 3.1.
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