Numerical analysis on convective heat transfer of 2-D tandem twin cylinders in a laminar flow

Based on flow field analysis software, simulation analysis was carried out for the 2-D convective heat transfer characteristics of the stationary and vibrating tandem twin cylinders with different spacing ratios by combining with UDF programming technology and dynamic meshing strategy. Results show that there is a critical spacing ratio of 3. 5 for 2-D convective heat transfer of both stationary and vibrating tandem twin cylinders with different spacing ratios. If the spacing ratio is less than 3.5, the heat transfer will become weak. Whereas if the spacing ratio is bigger than 3.5, the heat transfer will be enhanced and fluctuate slightly with varying spacing ratios. At a same spacing ratio, the average Nu number increases obviously for the vibrating cylinder, and the convective heat transfer increases notably. At different spacing ratios, the degree of synergy of velocity field and temperature field is different for 2-D flow through twin cylinders. Vibration of the twin cylinders improves field synergy, thus increasing convective heat transfer of the twin cylinders.