摘要
温度过高是目前临床神经外科骨磨削的技术瓶颈,纳米粒子射流喷雾式冷却(nanoparticle jet mist cooling,NJMC)是解决磨削热损伤的有效措施。建立最大未变形切屑厚度模型及热流密度模型,采用数理统计的方法建立NJMC条件下的对流换热系数模型,并进行喷雾式和NJMC条件下的骨微磨削温度场的数值仿真研究。结果表明:骨表面温度随纳米粒子体积分数的增大而减小。利用与人骨力学性能最相近的新鲜牛股骨密质骨进行微磨削试验,结果显示,以喷雾式冷却(32.7℃)作为对比试验,采用纳米粒子体积分数0.5%、1%、1.5%、2%、2.5%的纳米流体测得的表面温度分别降低了14.1%、17.1%、19.6%、22.9%、33.3%,验证了骨表面温度随纳米粒子体积分数的增大而减小的规律。理论分析与试验结果高度吻合,验证了理论建模的正确性。将机械加工技术用于医疗康复,旨在为降低神经外科临床骨磨削温度提供一种有效方法。
Excessively high temperature is currently the technical bottleneck in clinical neurosurgery bone grinding, while nanoparticle jet mist cooling(NJMC) is an effective solution to prevent heat injuries. Undeformed chip thickness model and heat flux model are established, and convective heat transfer coefficient model under NJMC condition is established by using mathematical statistics method. Results show that bone surface temperature decreases with the increase of nanoparticle volume fraction. The mechanical properties of bovine femur compact bone are most similar to human bone, which is used in the micro grinding experiment. Results found that, compare with mist cooling(32.7 ℃), temperature using 0.5%, 1%, 1.5%, 2%, 2.5% nanofluids is 14.1%, 17.1%, 19.6%, 22.9% and 33.3% lower, verifying the law of surface temperature decreases with the increase of nanoparticle volume fraction. The theoretical analysis is in good agreement with experimental results, confirming the validity of the theoretical model. Mechanical machining techniques are applied to healthcare, aiming to provide an effective way to lower micro-grinding temperature in clinical neurosurgery.
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2018年第18期194-203,共10页
Journal of Mechanical Engineering
基金
国家自然科学基金(51575290)
山东省重点研发计划(2017GGX30135,2018GGX103044)
山东省自然科学基金(ZR2017PEE011,ZR2017PEE002)资助项目
关键词
外科骨磨削
纳米粒子
喷雾式冷却
对流换热系数
温度场
neurosurgery bone grinding
nanoparticle
mist cooling
convective heat transfer coefficient
temperature field
