Session: 15-04 Turbulated Cooling

Paper Number: 128372

128372 - Experimental and Numerical Study on Heat Transfer and Turbulent Flow in Rotating Channel Roughened with Vortex Ribs 

Heat transfer and pressure loss characteristics of novel structure vortex rib in a rotating channel have been investigated both experimentally and numerically under the Reynolds number (Re) from 10,000 to 80,000 and Rotation number (Ro) from 0 to 0.385. The vortex rib cooling structure is proposed by combining W-shaped rib and W-shaped elongated dimple. Compared with the W-shaped rib, the vortex rib strengthens heat transfer by 2.6%-11.4% while reducing the pressure loss by 0.6%-18.7% under non-rotating and rotating conditions, showing high thermal performance. The vortex structure pattern in the channel of the vortex rib is consistent with that of the W-shaped rib, and the longitudinal vortex pairs carry the cold fluid from the mainstream to high-temperature wall surface, resulting in enhanced heat transfer. Compared with the W-shaped rib, the vortex rib is washed by the near-wall vortex, and the flow dead zones in both leading and trailing surfaces are heavily improved, and the velocity boundary layer is significantly thinned, which enhances the near-wall convective heat transport. It is also noted that the vortex rib can severely reduce the TKE in the mainstream of the cooling fluid but keep the near-wall high TKE region, guaranteeing the near-wall turbulent heat transport capacity.

Presenting Author: Chao Xu Shanghai Jiao Tong University

Presenting Author Biography: Chao Xu is currently a Ph.D. student at Shanghai Jiao Tong University. He has published four technical papers in journals. He has received several accolades, including the College's Excellent Master Dissertation Award and the title of School Outstanding Graduate. His research focuses on gas turbine internal cooling technology.

Authors:

Chao Xu Shanghai Jiao Tong University
Yu Rao Shanghai Jiao Tong University
Jianian Chen Shanghai Jiao Tong University
Yong Luan Shanghai Jiao Tong University