| 引用本文: | 李望旭,李正贵,韩伟,行怡帆,谭善文,司国雷,陈君辉.离心式铁磁流体微泵的设计及流动特性分析[J].哈尔滨工业大学学报,2024,56(4):137.DOI:10.11918/202303073 |
| LI Wangxu,LI Zhenggui,HAN Wei,XING Yifan,TAN Shanwen,SI Guolei,CHEN Junhui.Design and flow characteristics analysis of centrifugal ferromagnetic fluid micropump[J].Journal of Harbin Institute of Technology,2024,56(4):137.DOI:10.11918/202303073 |
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| 离心式铁磁流体微泵的设计及流动特性分析 |
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李望旭1,李正贵1,2,韩伟1,行怡帆1,谭善文2,司国雷3,陈君辉3
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(1.兰州理工大学 能源与动力工程学院,兰州 730050; 2.流体及动力机械教育部重点实验室(西华大学), 成都 610039; 3.四川航天烽火伺服控制技术有限公司,成都 611130)
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| 摘要: |
| 铁磁流体微泵由于其自润滑性和自密封性,使其更加符合微流控技术应用在生物医学、生命科学、化学分析、航空航天等领域的需求,而在目前的结构设计中无法同时满足加工简单、可靠性高、流动稳定等优势,因此限制其应用及发展。为提高铁磁流体微泵的可靠性和稳定性,促进其发展和应用,本研究基于铁磁流体的外场控制原理、磁流变效应及介质流体的流体力学行为设计了一种离心式的新型铁磁流体微泵,并应用数值计算分析了介质流体流动特性。结果表明:该微泵可以有效实现泵送过程,当转速为10 r/min时,一个周期内的泵送净流量可达0.07 kg/T,且在两股铁磁流体的交替作用下可以阻断泵腔进口与出口的介质流体质量交换；由于铁磁流体与泵腔结构的动静干涉作用,导致出口流量存在轻微脉动（数量级为10-5）,但仍处于层流状态 （Re＜1）,并且由于惯性力与特征尺寸相关而黏滞力与特征尺寸无关等力学因素,导致泵送动力对出口尺寸长度非常敏感,在转速4 r/min、出口段长度9 mm时无法实现有效泵送。同时对铁磁流体与泵送介质流体之间的相界面压力波动和自密封性能进行分析,得到相界面上的压力波动峰值远小于铁磁流体自密封性能,相差3个数量级,从铁磁流体的密封稳定性和界面稳定性角度验证了离心式铁磁流体微泵的可行性。 |
| 关键词: 铁磁流体 微泵 惯性驱动 泵送过程 重叠网格 |
| DOI：10.11918/202303073 |
| 分类号:TK05 |
| 文献标识码:A |
| 基金项目:国家自然科学基金(8,2);甘肃省创新之星项目(2023CXZX-8,2CXZX-442)；四川省重点研发计划项目(2023YFG0052)；广安市科技局重点研发计划项目(2022GYF01) |
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| Design and flow characteristics analysis of centrifugal ferromagnetic fluid micropump |
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LI Wangxu1,LI Zhenggui1,2,HAN Wei1,XING Yifan1,TAN Shanwen2,SI Guolei3,CHEN Junhui3
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(1.College of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou 730050, China; 2.Key Laboratory of Fluid and Power Machinery, Ministry of Education (Xihua University), Chengdu 610039, China; 3.Sichuan Aerospace Fiberhome Servo Control Technology Co. Ltd., Chengdu 611130, China)
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| Abstract: |
| Due to its self-lubricity and self-sealing, ferrofluid micropump is more in line with the needs of microfluidic technology applied in biomedicine, life science, chemical analysis, aerospace and other fields. However, current structural designs face challenges in simultaneously achieving simple processing, high reliability, stable flow characteristics, so the application and development are limited. In order to improve the reliability and stability of ferrofluid micropump and promote its development and application, a new type of centrifugal ferrofluid micropump is designed based on the external field control principle of ferrofluid, the magnetorheological effect and the hydrodynamic behavior between medium fluid. Numerical calculations are employed to analyze the flow characteristics of medium fluid. The results show that the micropump can effectively realize the pumping process.At a rotating speed of 10 r/min, the pumping flow can reach 0.07 kg/T in one cycle, and the medium fluid mass exchange between the inlet and outlet of the pump chamber can be blocked under the alternating action of two ferrofluid. Due to the dynamic and static interaction between ferrofluid and the pump chamber structure, the outlet flow rate has a slight pulsation (On the order of 10-5), but it still remains in laminar flow state (Re＜1). Moreover, due to mechanical factors such as inertia force being related to characteristic size while viscous force and characteristic size are unrelated, the pumping power of the structure is highly sensitive to outlet size and length. As a result, effective pumping cannot be achieved at a speed of 4 r/min and the length of the outlet section is 9 mm. The pressure fluctuation and the self-sealing performance of the phase interface between the ferrofluid and the pumping medium fluid are analyzed simultaneously. The peak value of the pressure fluctuation on the phase interface is much smaller than the self-sealing performance of the ferrofluid, differing by three orders of magnitude. The feasibility of the centrifugal ferrofluid driver is verified from the perspective of the sealing stability and the interface stability of the ferrofluid. |
| Key words: ferrofluid micropump inertia drive pumping process overlapping grid |
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