This paper presents numerical quasistatic simulation results of the air entrainment phenomenon between a web and a spirally grooved roller. The numerical results show that during one complete rotation of the spirally grooved roller, the traction coefficient between the web and the roller changes with time due to the changing shape of the groove in the contact region, and the average traction coefficient of the circumferentially grooved roller is higher than that of the spirally grooved roller. Using a laser sensor, web deflection is measured and compared with the numerical results at the inlet. Furthermore, a smoke wire experiment shows a clear view of the air entrainment phenomenon at the entrance, between the web and the roller.
This paper presents numerical quasi-static simulation results of air entrainment phenomenon between a web and a spirally grooved roller. The numerical result shows that during one circle rotation of spirally grooved roller, traction coefficient between the web and roller is changed according to time due to changing shape of groove in contact region and average traction coefficient of spirally grooved roller is higher than circumferential grooved roller. Using laser sensor, web deflection is measured and compared with the numerical results of web deflection at the entrance region. Furthermore, smoke wire experiment shows a clear view of air entrainment phenomenon at the entrance region between the web and roller.
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