Figure 7
From: Enhanced condensation heat transfer using porous silica inverse opal coatings on copper tubes
Coating durability. (a) The silane coating on the copper tube degraded after 5–8 experimental runs. The heat transfer coefficient for DWC decreased from ≈ 79 kW/m2 K (first experiment) to ≈ 13 kW/m2 K (eighth experiment). The enhanced heat transfer coefficient for the inverse opal coated copper tube (b) and the oil-impregnated copper tube (c) remained nearly the same at ≈ 80 kW/m2 K (IOC) and ≈ 102 kW/m2 K (SLIPS) when condensation experiments were conducted for the first, tenth, and twentieth times. This result shows the durability of our coating.
