| Title |
An Experimental Study on the Effects of Porous Layer Treatment on Evaporative Cooling of an Inclined Surface |
| Keywords |
Evaporation heat transfer ; 증발 열전달 ; Surface Characteristics ; 표면특성 ; Wettedness ; 젖음도 ; Porous layer ; 다공물질층 ; Inclined surface ; 경사표면 |
| Abstract |
Falling film heat transfer has been widely used in many applications in which heat and mass transfer occur simultaneously, such as evaporative coolers, cooling towers, absorption chillers, etc. In such cases, it is desirable that the falling film spreads widely on the surface forming thin liquid film to enlarge contact surface and to reduce the thermal resistance across the film and/or the flow resistance to the vapor stream over the film. In this work, the surface is treated to have thin porous layer on the surface. With this treatment, the liquid can be spread widely on the surface by the capillary force resulting from the porous structure. In addition to this, the liquid can be held within the porous structure to improve surface wettedness regardless of the surface inclination. The experiment on the evaporative cooling of an inclined surface has been conducted to verify the effectiveness of the surface treatment. It is measured that the evaporative heat transfer increases about 50% by the porous layer treatment as compared with that from orignal bare surfaces. |