Can We Treat the China Smog? Lessons Learned from the Exquisite Design of Microcirculation for Super Lubrication

讲座名称: Can We Treat the China Smog? Lessons Learned from the Exquisite Design of Microcirculation for Super Lubrication
讲座时间: 2017-01-05
讲座人: 吴千红
形式:
校区: 兴庆校区
实践学分:
讲座内容: 应热动力工程系李军教授邀请,美国宾夕法尼亚州维拉诺瓦大学(Villanova University)机械工程系吴千红(Qianhong WU)副教授来访我校,并做学术讲座   讲座名称:Can We Treat the China Smog? Lessons Learned from the Exquisite Design of Microcirculation for Super Lubrication 讲座人:吴千红(Qianhong WU)副教授 讲座时间:2017年1月5日(星期四)上午9:30-11:30 讲座地点:北二楼1402室 讲座摘要: Biological scientists have wondered, since the motion of red cells was first observed in capillaries, how a red cell, with an 8µm diameter, can move with so little friction in tightly fitting microvessels, only 5-6 µm in diameter, and survive 105 passages through microcirculation during a typical lifetime of 120 days without being damaged or undergoing hemolysis. Recent studies (Feng and Weinbaum, JFM, 2000; Weinbaum et al., PNAS, 2003; Wu et al., PRL, 2004) attributed this frictionless motion to the dramatically enhanced hydrodynamic lifting force generated inside the endothelial glycocalyx layer (EGL), a soft porous layer that covers the inner surfaces of our capillaries, as a red blood cell glides over it. Lift generation inside highly compressible porous media is a new concept for porous media flow. In this talk, a systematic study of this concept is presented. Its diverse applications, from red cells moving in a tightly fitting capillary, to human skiing or snowboarding, to a next generation high speed train that glides on a soft porous track made of goose down pillow will be discussed as examples. These applications are chosen for their novelty, but the basic concepts could have important application in the design of soft porous bearings with greatly increased lubrication pressures and long life.      
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