Equilibrium of a liquid in a rotating groove

✍ Scribed by David K. Boadi; Abraham Marmur

• Publisher: Elsevier Science
• Year: 1992
• Tongue: English
• Weight: 761 KB
• Volume: 47
• Category: Article
• ISSN: 0009-2509
• DOI: 10.1016/0009-2509(92)85106-l

✦ Synopsis

AIrstract-Equilibrium

liquid retention in concentric grooves on a rotating disk has been studied in order to improve the understanding of lubricant retention on computer disks. Three simplified model systems, a cylindrical, positive trapezoidal and negative trapezordal groove, have been used to calculate equilibrium liquid-vapor profiles. Emphasis has been put on calculating the critical rotation speed, above which the liquid cannot stay at equilibrium, and on the critical height, which is the height of the liquid at the outer wall of the groove, at the critical speed. Results show that the critical speed is generally highest for the negative trapezoidal groove, and lowest for the positive trapezoidal one. It does not depend on the amount of liquid in the case of cylindrical grooves, but does depend on it in trapezoidal grooves. Also, increasing the contact angle increases the critical speed. The critical height is infinite for cylindrical grooves, exceeds the height of a negative trapezoidal groove, and is finite for a positive trapezoidal groove.