Therefore, when the superheat is low, the boiling performance of each surface is basically consistent. As the superheat further increases, the boiling curves on the surfaces of NPD2, NPD3, and NPD4 shift slightly to the left.
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 shift slightly to the left.