Abstract
In the paper industry, to determine the installation positions of concentration sensor and flow sensor of pulp pipe transportation system, the length of pipe inlet section of pulp fluid must be determined. In order to solve the problem that it is difficult to determine the length of pipe inlet section of pulp fluid, the paper presents a method to determine the length of pipe inlet section of pulp fluid, and the relationship between the length of inlet section and pulp fluid parameters is studied by this method. Firstly, CFD (Computational Fluid Dynamics) method is applied to obtain flow velocity and solid phase concentration distribution data of pulp fluid at different axial positions in the pipe. Then, Pearson correlation coefficient method is applied to analyze these data. Finally, the length of pipe inlet section of pulp fluid is determined according to the obtained correlation coefficient, and the relationship between the length of pipe inlet section of pulp fluid and initial average flow velocity and solid phase concentration is obtained. The conclusion shows that the method can well obtain the length of pipe inlet section of pulp fluid, which provide some theoretical basis for the design of pulp pipe transportation system.
Highlights
In the paper industry, pulp fluid concentration and pulp flow velocity are the two most frequently measured physical quantities
(3) The method and conclusion of this paper provide theoretical support for how to determine the installation position of pulp concentration sensor and flow sensor on the pipeline, which is of certain significance to the design of pulp pipeline transportation system in paper industry
The method for determining the length of pipe inlet section of pulp fluid in this paper is as follows: a plurality of positions are sequentially selected in the axial direction of the pipe, and the flow velocity and concentration distribution of pulp fluid at these positions are obtained by Computational Fluid Dynamics (CFD) method, when the velocity and concentration distribution on all pipe areas downstream of a certain position reach a stable state, the upstream of this position is pipe inlet section, and the downstream of this position is pipe fully developed section
Summary
Pulp fluid concentration and pulp flow velocity are the two most frequently measured physical quantities. The method for determining the length of pipe inlet section of pulp fluid in this paper is as follows: a plurality of positions are sequentially selected in the axial direction of the pipe, and the flow velocity and concentration distribution of pulp fluid at these positions are obtained by CFD method, when the velocity and concentration distribution on all pipe areas downstream of a certain position reach a stable state, the upstream of this position is pipe inlet section, and the downstream of this position is pipe fully developed section. (1) Under the conditions of different initial average flow velocity and initial solid phase volume concentration, the length of pipe inlet section of pulp fluid is different; Figure 6. [2] In this paper, Pearson correlation coefficient method is used to analyze the data of flow velocity and solid phase volume concentration of pulp fluid at various positions in the axial direction of the pipe, the more positions are selected in the axial direction of the pipe, the more accurate the results are. If the length of pipe inlet section of pulp fluid is determined by the method in this paper, the number of positions selected in the axial direction of the pipe should be as large as possible when the conditions permit
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