Flow Analysis around a Rotating Roll.

The modification of the GSMAC finite-element method has been used to simulate the fluid flow created by a pair of rotating rolls. To verify the validity of the results thereby obtained, a flow visualization test was performed by a hydrogen bubble test. The fluid velocity distribution as well as the boundary layer thickness values thus obtained by calculation and test showed a high degree of agreement. The present technique was then applied in analyzing the fluid flow and diffusion of moisture in the dryer section of a paper machine. The numerical analysis clearly defined how the velocity distrubution would vary with or without the air nozzle, and clarified the diffusion effect of the air nozzle.