Figure 6
From: Enhanced condensation heat transfer using porous silica inverse opal coatings on copper tubes
Heat transfer measurement. (a) Heat flux and (b) heat transfer coefficient as a function of logarithmic mean temperature difference. The slope in (a) is the heat transfer coefficient (\(h_{c}\)). The heat transfer coefficient for DWC and IOC are nearly identical at ≈ 80 kW/m2 K; a sevenfold increase from FWC (≈ 12 kW/m2 K). The heat transfer coefficient increased further by ≈ 30% to ≈ 103 kW/m2 K when the silica pores were impregnated with oil (SLIPS condensation). The classical Nusselt model for laminar film condensation is used to validate our heat transfer measurements.
