A study on multi-branch channel thermal mixing flow by Lattice Boltzmann method and field synergy principle

• Main Authors: Cheng-Chi Chang, 張鉦淇
• Other Authors: Chao-Kuang Chen
• Format: Others
• Language: zh-TW
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/41790448978282811749

碩士 === 國立成功大學 === 機械工程學系碩博士班 === 95 === This study applies the Lattice Method to simulate low Reynolds number, steady-state and 2-D incompressible thermal mixing flow in a multi-branch channel. The pressure difference of inlet and outlet is set appropriately so that the fluid particles can be driven. To accelerate the efficiency of the thermal mixing, the distinct shapes of obstacles are inserted into the straight wall being in back of the multi-branch channel. After the fluid particles bomb into the obstacles, the variation of the flow and temperature field then generated. When the fluid particles flow past the inserted obstacles in two parallel plates, the perturbation caused by the impact will affect the heat transfer of the flow. This type of flow is associated with the fabrication design along with the effect of heat transfer so that the application is very important. If we consider the flow with temperature difference mix inside the channel, the geometry of the channel will have great effect on thermal characteristics. We place numbers of obstacles being in the form of wavy-like and touch down circle in the back straight part of multi-branch channel. When fluid particles flow past these obstacles, the recirculation regions are raised due to the pressure drag. The recirculation region impact on the temperature distribution magnificently and hasten the efficiency of the thermal mixing. Taking another view of field synergy principle specify the thermal mixing problem. The increase of intersection angle will accelerate the heat exchange rate between high-temperature and low-temperature fluid particles.