[英文]滑滚表面间的流体膜壁面滑移和流体动力学.pdfVIP

第23卷第5期 计 算 力 学 学 报 V ol. 2 3, N o . 5 2006 年 10 月 Chinese Journal of Computational Mechanics October 2006 文章编号: 10074708( 2006) 05052907 Wall slip and hydrodynamics of a fluid film between slidingrolling surfaces M A Guojun, WU Chengwei* ( State K ey L aborat ory of Structural A nalysis fo r Industrial Equipment, Department of Eng ineering M echanics, Dalian U niversity o f T echnolog y, Dalian 116024, China) Abstract: T he classical Reyno lds lubricat ion theo ry is based on the no w allslip assumption. During the recent years many ex periments report ed evidences o f wall slip o ccurring in a fluid film f low . T he flow behavior and hy dro dy namic respo nse of a fluid film co nf ined betw een tw o so lid surfaces are studied in t he present paper. It is found that wall slip dramatically affects hydro dy namics of t he fluid f ilm. T he hydro dy nam ic pressure is not o nly affected by the fluid viscosit y and g ap g eometry, but also stro ng ly controlled by w all slip and by what a surface moves. By controlling the surface adhesio n property , ev en a zero frictio n surface can be obtained. On t he other hand, if the tw o surfaces of a sliding gap have the same slip property , a critical sliding speed ex ists for t he fluid hy drodynamic response t o tot ally disappea r. In pure ro lling, how ever, a considerable hydrodynamic response still ex ists even the surface limit ing shea r stress is small. Key words: w all slip; limiting shear st ress; hydro dy namic pressure Bair and Winer[ 2, 3] found that lubricants g iv e rise 1 Introduction to a lim