| 主动调压型微孔壁管道流场特性数值仿真 |
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| 引用本文： | 坎标,高运,徐盛松,丁建宁. 主动调压型微孔壁管道流场特性数值仿真[J]. 排灌机械工程学报, 2020, 38(2): 183-187. DOI: 10.3969/j.issn.1674-8530.18.0020 |
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| 作者姓名： | 坎标 高运 徐盛松 丁建宁 |
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| 作者单位： | 常州大学机械工程学院,江苏常州213164;常州大学低维材料微纳器件与系统研究中心,江苏常州213164;常州市模具先进制造高技术研究重点实验室,江苏常州213164;常州大学机械工程学院,江苏常州213164;常州大学机械工程学院,江苏常州213164;常州大学低维材料微纳器件与系统研究中心,江苏常州213164;江苏大学微纳米科学技术研究中心,江苏镇江212013 |
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| 基金项目： | 国家自然科学基金资助项目(51335002,51105046);江苏省高校“青蓝工程”项目 |
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| 摘 要： | 为降低因管道阻力而导致的流体能量损失,实现流体增速效果,提出了一种主动调压型微孔壁面管道模型.在该模型中,微孔中的空气为液相流体提供边界约束,从而降低其输运阻力.增速效果可以通过控制微孔中的空气压力而调整.利用流体力学仿真方法,对管道内的流场特性及增速效果开展数值计算.结果表明:与相同条件直管道相比,平均增速比可达到2%~6%,最高超过了12%;增速效果在液相入口压力较低时更为明显,并随着气相压力的增加呈现先增强后减弱的趋势;气相压力对流速的有效调节范围随液相入口压力的增大而减小.微孔口气液界面处呈现小曲率对称型弯月面时可以实现增速效果,但弯月面呈现非对称弧形曲面时实现最佳增速效果的情况也存在.
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| 关 键 词： | 微流体 微孔壁面 增速 主动调压 数值仿真 |
| 收稿时间： | 2018-01-22 |
Numerical simulation of flow field characteristics of pressure controllable pipe with microporous walls |
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| KAN Biao,GAO Yun,XU Shengsong,DING Jianning. Numerical simulation of flow field characteristics of pressure controllable pipe with microporous walls[J]. Journal of Drainage and Irrigation Machinery Engineering, 2020, 38(2): 183-187. DOI: 10.3969/j.issn.1674-8530.18.0020 |
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| Authors: | KAN Biao GAO Yun XU Shengsong DING Jianning |
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| Affiliation: | 1. School of Mechanical Engineering, Changzhou University, Changzhou, Jiangsu 213164, China; 2. Center for Low-Dimensional Materials, Micro-Nano Devices and Systems, Changzhou University, Changzhou, Jiangsu 213164, China; 3. Changzhou High Technology Research Key Laboratory of Mould Advanced Manufacturing, Changzhou, Jiangsu 213164, China; 4. Center for Micro/Nano Science and Technology, Jiangsu University, Zhenjiang, Jiangsu 212013, China |
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| Abstract: | Aiming to reduce the energy loss of flow induced by the resistance of pipes and accelerate the flow rate,a model of pressure controllable pipe with microporous walls was promoted.The air in the micropore provided boundary constraint for the flow and helped to reduce the resistance.The effect of flow rate acceleration could be modulated by controlling the pressure of the air in the micropore.Based on the numerical simulation,the flow field characteristics and the efficiency of flow rate acceleration were calculated.The results show that the flow rate is increased by 2.0%-6.0%compared with the cases in straight pipes,and the maximum value is over 12.0%.The acceleration is achieved when the input pressure of liquid is low.Flow acceleration is strengthened before it is weakened with the increase of gas pressure.The modulation of flow rate by gas pressure is limited for the liquid phase of high pressure.Flow rate accelerations are observed when the meniscus at the micropore is in symmetric shape with small curvature.However,the most prominent acceleration of the flow rate can be observed even when the meniscus is in asymmetric shape.By comparing the patterns of liquid-gas interface,the conditions for steady interface and flow rate acceleration are analyzed. |
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| Keywords: | microflow microporous wall flow rate acceleration pressure control numerical simulation |
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