Beschreibung:
To promote the heat transfer capacity of the condenser end in the heat pipe heat exchanger, the experimental and numerical investigation have been carried out to study the heat transfer and fluid flow characteristics for three densely longitudinal fins enhanced annular heat exchanger (AHE) units, which was fabricated by the Selective Laser Melting. The AHE 1 as the baseline featured by the long straight fins. The AHE 2 and AHE 3 were short folded fin and arc-shaped fins respectively, in which 40 rows fins were arranged just like the blade-lattice. The attain results showed that the AHE 2 and AHE 3 had Nusselt number that were 27% and 35% higher than AHE 1, and friction factors that were 1088% and 2209% higher than AHE 1, respectively. It indicates that dense fins arrangement has relatively limit influence on the wall temperature and overall heat transfer capacity. However, the friction loss is significantly sensitive to the fins arrangement because of the severe flow drag and flow separation induced by the blade-lattice like fins. The thermo-hydraulic performance evaluation suggests that the three AHEs are suitable for different application scenarios for different heat transfer and pressure loss requirements. This work provides a reference for the heat exchanger design in the heat pipe based thermal power conversion system