Lattice Boltzmann simulations of heat transfer in stirred tanks with two-, three- and four-blade oscillating impellers are performed. The Nusselt numbers of the tank caused by the three types of impellers are enlarged as Re increases. The influences of oscillating amplitude of impeller on heat transfer effect are investigated. It indicates that a large swept azimuth of the impeller would induce concentric-like flow structures, which are disadvantageous for heat transfer on tank walls. The results indicate that there exists a peak value of Nu on the tank walls as the oscillating amplitude of impeller is slightly less than the value to sweep whole tank azimuth. For the two- and three-blade impeller cases, the peak values occur at 70 and 50 degrees. Because the flow phenomena caused by the four-blade impeller is complex, there are other peaks of Nu observed except the primary peak at 40 degrees. It is also found that the concentric-like flow structures would be broken gradually at a higher oscillating angle. The present work shows that the type of impeller and relative operating parameters should be well chosen to get the best synergy of the flow and temperature fields.
|Translated title of the contribution||Heat Transfer Analysis of Stirred Tank with Different Number of Oscillating Blades by the Lattice Boltzmann Method|
|Number of pages||10|
|Journal||Journal of the Chinese Society of Mechanical Engineers, Transactions of the Chinese Institute of Engineers, Series C/Chung-Kuo Chi Hsueh Kung Ch'eng Hsuebo Pao|
|Publication status||Published - 2017 Oct 1|
All Science Journal Classification (ASJC) codes
- Mechanical Engineering