A Study on Flow Characteristics of Pulp Suspension Flow : Measurements of Turbulence Intensity and Fiber Concentration Unevenness

概要

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In order to examine the relationship between the turnbulence intensity and the fiber concentration unevenness in the flow of pulp suspension, these quantities were measured in a duct with various types of turbulence generators installed at the duct inlet. The turbulence intensity of suspension flow was measured by two small pressure transducers and the concentration unevenness was measured as the intensity fluctuation of light transmitted through the pulp suspension in the duct section. The results show that the concentration unevenness is inversly related to the turbulence intensity. It is also found that there is a time delay in change of the concentration unevenness due to the turbulence. It is believed that the test results provide useful information on development of improved paper-machine headboxes.
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