Mist Flow in Through-Tool Minimum Quantity Lubrication Drilling: Two-Phase Flow Simulation and Experimental Observation
Mist Flow in Through-Tool Minimum Quantity Lubrication Drilling: Two-Phase Flow Simulation and Experimental Observation
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通过工具微量润滑钻井中的雾流：两相流模拟和实验观察
DOI：
10.1115/1.4056146
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发表时间：
2023
期刊：
影响因子：
--
通讯作者：
Tai, Bruce L.
中科院分区：
文献类型：
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作者：
Raval, Jay K.;Tai, Bruce L.
通过工具最小量润滑（MQL）钻井已经在工业上应用了几十年，但由于无法进行现场测量，关于冷却液通道设计和对流体分布的影响的信息很少。本研究利用欧拉-拉格朗日计算流体动力学（CFD）模型揭示了MQL钻井中的两相流动特性。空气是模拟为可压缩和湍流的初级相。润滑油液滴被模拟为具有适当尺寸分布的离散颗粒。考虑了双向耦合和液滴-壁面相互作用。结果表明，初相可以达到跨声速区域的速度，并且依赖于通道的螺旋路径。此外，大部分润滑油液滴（>95%）撞击通道壁面形成流体膜，而不是跟随气流。在切割区，无论是圆形通道还是三角形通道，液滴都很难到达切割边缘。最后，使用定制的钻井试验台以及透明的工作材料模拟物来观察和定性验证这些结果。
Through-tool minimum quantity lubrication (MQL) drilling has been used in industry for decades, but little information is available on the coolant channel design and the effect on fluid distribution due to the inability of in-situ measurement. This study utilizes an Euler–Lagrange computational fluid dynamics (CFD) model to uncover the two-phase flow behavior in MQL drilling. Air is the primary phase modeled as a compressible and turbulent flow. The lubricant droplets are simulated as discrete particles with a proper size distribution. Two-way coupling and droplet-wall interactions are both considered. The results show that the primary phase can reach velocities in the transonic region and is dependent on the helical path of the channel. In addition, most of the lubricant droplets (>95%) impact the channel wall to form fluid film instead of following the air stream. In the cutting zone, droplets can hardly reach the cutting edges in both circular and triangular channel shapes. Finally, a custom-made drilling testbed, along with a transparent work-material simulant, is used to observe and qualitatively validate these results.