Enhanced heat dissipation of ribbed channels based on the coupling optimization of multiple structural parameters

The heat dissipation of ribbed channels is dominant by the strong coupling of multiple structural parameters, while it is less concerned due to the lack of efficient methodology both in experimental and numerical solutions. In the present work, the movable experimental facility and the CFD solutions based on the conjugate gradient method are established. Firstly, the coupling impacts of different parameters on the airflow field in the channel are identified. It is found that the longitudinal vortices coupling with transverse secondary flows are in charge of the heat dissipation of the ribbed channel. And the longitudinal vortices are affected by the relative roughness spacing, and the transverse secondary flow is mainly dependent on the aspect ratio for L-shaped rib, while for the V-shaped and W-shaped ribs, the transverse secondary flow mainly is mainly dependent on the angle of attack. Secondly, the coupling optimization of different ribs is completed and the optimal structural parameters are obtained using the developed experimental and numerical methodology. Overall, compared with the smooth channel, the optimal L, V and W-shaped ribs deliver the Nusselt number increasing by 83.04%, 155.18% and 197.17%.

Automated summary

This study investigates the coupling effects and optimization methods in the heat dissipation of ribbed channels. Through the establishment of a movable experimental facility and CFD solutions based on the conjugate gradient method, the research identifies the key factors affecting heat dissipation and obtains optimal structural parameters for L-shaped, V-shaped, and W-shaped ribs. Experimental and numerical results demonstrate that the longitudinal vortices coupling with transverse secondary flows play a significant role in heat dissipation, and the optimal ribs can greatly improve the Nusselt number compared to smooth channels.