Abstract
According to the field synergy principle, the convective heat transfer characteristics in micro-channels with dimples, cylindrical grooves and low fins are numerically studied, and the reasons of the enhanced heat transfer in the dimple and cylindrical channels are in two ways: 1) increasing the turbulence of fluid near the wall and enhancing heat transfer between the main stream and the fluid inside the dimples or cylindrical grooves; 2) dimples and grooves can extend more surface for the total heat transfer. Compared with low fins, only the fluids inside or near dimples and grooves are influenced and dimples or grooves do not have much impact on the main stream such that more flow resistance can be avoided. We proposed a parameter PEC A as the evaluation coefficient, and the results show that the PEC A of the dimple channel is slightly higher than that of the cylindrical channel, but much higher than that of the low fin channel.
| Original language | English |
|---|---|
| Pages (from-to) | 1225-1228 |
| Number of pages | 4 |
| Journal | Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics |
| Volume | 33 |
| Issue number | 7 |
| State | Published - Jul 2012 |
Keywords
- Convective heat transfer
- Field synergy principle
- Heat transfer enhancement