CAJ | 학술논문

液固两相流中的细小且体积浓度低的固相颗粒在液相流动影响下，除受颗粒重力作用外，还有Stokes阻力、Saffman 力、压力梯度力、附加质量力等的共同作用，并在液相流场中作不可控的运动。为了有效控制固相颗粒运动，该文在二维泊肃叶流场的垂直方向上设计一高压静电场，使电场力作用于荷电固相颗粒，并建立了有界黏性流体在二维泊肃叶流场和高压静电场同时作用下带电颗粒的运动力学模型，分析了固相颗粒的运动规律，并设计了多物理场耦合条件下的固液两相分离装置。利用该装置对清洁度为NAS12的L-HM32#抗磨液压油进行颗粒分离试验，12 h后，2～100μm的颗粒数目显著减少，颗粒分离效率高达到95%，液压油清洁度达到NAS4级，实现高效的固液分离和固相颗粒分选。
액고량상류중적세소차체적농도저적고상과립재액상류동영향하，제수과립중력작용외，환유Stokes조력、Saffman 력、압력제도력、부가질량력등적공동작용，병재액상류장중작불가공적운동。위료유효공제고상과립운동，해문재이유박숙협류장적수직방향상설계일고압정전장，사전장력작용우하전고상과립，병건립료유계점성류체재이유박숙협류장화고압정전장동시작용하대전과립적운동역학모형，분석료고상과립적운동규률，병설계료다물리장우합조건하적고액량상분리장치。이용해장치대청길도위NAS12적L-HM32#항마액압유진행과립분리시험，12 h후，2～100μm적과립수목현저감소，과립분리효솔고체도95%，액압유청길도체도NAS4급，실현고효적고액분리화고상과립분선。
In a liquid-solid two-phase flow, small and low volume concentration of the solid particles make the uncontrollable movement in liquid phase flow field under the gravity, the Stokes drag force, the Saffman force, the pressure gradient force, the virtual mass force and so on. In order to control the law of the particle’s motion, it is necessary to add the external controllable force to the liquid-solid two-phase flow field. Therefore, the particle’s motion is changed by changing the value of the external force. In the vertical direction of the two-dimension Poiseuille flow field, a high-voltage electrostatic field was designed. That is to say, the controllable electrostatic field force was applied to the charged solid particles. In addition, the charged particle’s kinematics model was established under the two-dimension Poiseuille flow and the high-voltage electrostatic field in the bounded viscous fluid field, then the movement law and the main conditions effecting the movement of the charged solid particle were analyzed. According to the charged particle’s kinematics model in the multi-physics field coupling conditions, solid and liquid two-phase separators were designed in this paper. The folding-shaped dust collection media was installed on the separator at the direction of liquid phase flow, and 15 kV electrostatic was added to the positive and negative electrode of the separator. A particle separation experiment was conducted using this separator on L-HM32# used antiwear hydraulic oil provided by the Shandong Hengye Electromechanical Technology Company, and the used oil cleanliness level was NAS12. In the case of maintaining a constant liquid velocity, the hydraulic oil sample was taken once from the oil storage tank of the solid-liquid separator every three hours, and then the number of particles in the oil sample was measured respectively for the 2-5, 5-15, 15-25, 25-50, 50-100 μm diameter particles using the AMF particle counter designed by the Markus Klotz Gmbh company. After working 12 hours, the number of 2-100μm particles were significantly reduced, the various size particles separation efficiency was about 95%, and the hydraulic oil cleanliness level reached NAS4. After working 24 hours, the number of 2-5 and 5-15μm particles in the oil were continuously reduced, but the purification effect was not obvious. On the contrary, the number of 15-100 μm particles in the oil were increased slightly. Moreover, the largest increase in the number was the 50-100μm big particles. That is to say, the solid-liquid separation efficiency will decrease when the separator works more than 12 hours. The experiment illustrated that the movement law of the charged particles in two-dimensional Poiseuille flow field was effectively controlled. At the same time, the experiment achieved a highly efficient solid-liquid separation and sorting of solid particles, which improved the purification rate and recycling utilization rate of waste oil. By studying the kinetics law of the particles in the two-phase flow of the two-dimensional Poiseuille under the external force, a valuable reference is provided to recycling and reuse of the waste industrial oil, purification of the pollution water, and energy conservation.