カップミキシング方式のかくはん特性と性能評価 : 数値シミュレーションによる単一液体のかくはん流解析(流体工学,流体機械)

抄録

Cup-mixing system (Cup-type Vessel mixed by paddle) becomes so dominant system in cup-type beverage vending machines that the optimum design procedure for paddle stirrer geometry, its setting location, its revolutions, etc, is strongly required to be quickly specified for different kind of beverage materials. This work aims first at numerically simulating the stirring flow-fields of cup-type mixing vessel, second characterize the stirring flow phenomena by introducing a new standard measure called fluid exchange frequency, and finally at evaluating the stirring characteristics resulting in the optimum condition. The simulation with the sliding mesh method is carried out of water stirring flow in the cup-type vessel, which is mixed by paddles with a revolution of 900 rpm. Based on the verification of the stirring flow simulation with the flow visualization experiment, the fluid exchanging frequency is proved to be helpful to evaluating the stirring performance locally and entirely.