An experimental study of the flow in a modeled hydraulic headbox of a papermaking machine was performed. The turbulent boundary layer generated on the partition plates in the dispersion part and the wake formed downstream of the plates were investigated by a flow visualization technique using the smoke-wire method and by hot-wire measurement. Control of the flow characteristics was examined for various combinations of two types of channel and four types of inserted plate that differ in convergence and trailing-edge shape, respectively. As a result, rectification by the use of a convergent channel was found to be effective in realizing a uniform time-averaged velocity distribution and in reducing and unifying the turbulence intensity. Furthermore, the trailing edges with tapered and wavy shapes were effective for obtaining a uniform time-averaged velocity distribution, and the tapered edge was highly effective for making the turbulence intensity a uniform distribution.
Flow Control of Dispersion Section of Hydraulic Headbox of Papermaking Machine
M. SumidaRelated information
1 Takaya Umenobe, Higashi-Hiroshima, Hiroshima 739-2116, Japan
, S. SuzukiRelated information2 Metso Paper Japan Co., Ltd., 3-10 Togiya-cho, Okayama 700-0826, Japan
Published Online: February 19, 2013
Abstract
Keywords: Flow Control, Flow Visualization, Wake, Convergent Channel, Turbulence, Headbox, Papermaking Machine