| Title |
Analysis on Wetting Behavior of A Lamellar Type Wet Channels in An Evaporative Heat Exchanger |
| Authors |
Dong-Wook Oh ; Jae Bum Park ; Chan Ho Song |
| DOI |
http://dx.doi.org/10.6110/KJACR.2016.28.7.283 |
| Keywords |
증발식 열교환기 ; 친수성 표면 ; 표면 젖음도 ; 층상 구조 Evaporative heat exchanger ; Hydrophilic surface ; Surface wettability ; Lamellar structure |
| Abstract |
One of the most important factors for determining the thermal performance of an evaporative cooling system is the wettability of the evaporative heat exchanger surface. Evaporation of a widely spread water film on the heat exchanger surface promotes heat transfer between the "dry" air and "wet" air passages. Hydrophilic coating is generally applied on the heat exchanger surfaces to increase the wettability of the heat exchanger surface and the COP of the evaporative cooling system. In this paper, a simple lamellar patterned structure is suggested to maximize the spreading of a water film on the vertically oriented walls. The capillary height of the lamellar structured grooves is analyzed through a theoretical model, and the results are compared with the numerical analysis through a finite element analysis tool, SE-FIT. A good agreement between the theoretical model and the numerical analysis can be observed as long as the channel depth is comparable to or larger than the channel width of the lamellar structure. |