Influences of eccentricity ratio on the internal flow and cavitation characteristics of progressing cavity pump

2021 ◽  
pp. 095440622199840
Author(s):  
Yiran Wang ◽  
Xiaodong Yu ◽  
Xiaoxiao Han ◽  
Hao Yan ◽  
Qiang Li ◽  
...  
Keyword(s):  
Internal Flow ◽  
Test Method ◽  
Volume Distribution ◽  
Eccentricity Ratio ◽  
Eccentric Rotation ◽  
Optimal Value ◽  
Pump Test ◽  
Value Range ◽  
Contrast Analysis ◽  
Volume Efficiency

A Progressing Cavity Pump (PCP) works by forming a progressive seal cavity through the eccentric rotation of rotor. PCP parameters, such as eccentricity ratio [Formula: see text], can influence its performance and cavitation characteristics. The internal correlation among clearance fluid, cavitation characteristics, and pump performance should be explored to reveal the variation laws of internal flow and cavitation characteristics in PCP under different [Formula: see text]. In this study, a contrast analysis on external characteristics (e.g. volume efficiency) of pump with different eccentricity ratios was carried out by combining an RNG [Formula: see text] turbulence model based on Singhal full-cavitation model and the model pump test method. Moreover, gas volume distribution of PCP was analyzed and the optimal value range of eccentricity ratio was proposed. Results demonstrate that the axial force and axial power of PCP basically remain the same, volume efficiency increases, and cavitation performance decreases with the increase of [Formula: see text], and the optimal value for [Formula: see text] ranges from 0.17 to 0.24. In addition, a revised NPSHQ is proposed to quantify the cavitation characteristics of PCP.

Effect of Ball Material Ratio on the Grinding Efficiency of Copper-Bearing Minerals in Dahongshan

2012 ◽  
Vol 616-618 ◽  
pp. 619-623 ◽  
Author(s):  
Chun Mei Wang ◽  
Gu Zhang Zhuang ◽  
Hai Yin
Keyword(s):  
Critical Value ◽  
Optimal Range ◽  
Operation Optimization ◽  
Particle Size Fractions ◽  
Fine Grinding ◽  
Optimal Value ◽  
Value Range ◽  
Optimal Value Range ◽  
The One ◽  
Grinding Efficiency

In this paper, The Copper-bearing minerals Powder (≤2mm) in Dahongshan is used in conical ball grinding, the experimental study shows that the effect of ball material ratio on the grinding efficiency is obvious. The critical value and the optimal value range of the ball material ratio are different on different grinding stages, the feasible ball material ratio of coarse grinding is bigger than the one of fine grinding. In the test conditions, in terms of the ball material ratio, the critical value of ores’ over crushing in coarse grinding is 13, and the optimal range is 6-8, which is beneficial to the next beneficiation; while the critical value in fine grinding is 7 and the optimal range is 5-7. Although the ball material ratios are different, the change rule of grinding fineness corresponding to different particle size fractions is consistent, which can be used as a reference in the site operation optimization.

The optimal value range problem for the Interval (immune) Transportation Problem

Omega ◽  
2020 ◽  
Vol 95 ◽  
pp. 102059 ◽  
Author(s):  
C. D’Ambrosio ◽  
M. Gentili ◽  
R. Cerulli
Keyword(s):  
Transportation Problem ◽  
Optimal Value ◽  
Value Range ◽  
Optimal Value Range

Experimental Study on Removal of NO Using H2O2/UV System

2014 ◽  
Vol 955-959 ◽  
pp. 2300-2305
Author(s):  
Rong Zhi Zhao ◽  
Bao Rui Liang ◽  
Ying Chen ◽  
Cun Yi Song ◽  
Zhen Song Tong ◽  
...  
Keyword(s):  
Experimental Study ◽  
Gas Flow ◽  
Solution Concentration ◽  
No Removal ◽  
Initial Concentration ◽  
Experimental Platform ◽  
Optimal Value ◽  
Value Range ◽  
Optimal Value Range ◽  
Removal System

In this paper, use homemade experimental platform to experimental study on removal of NO using H2O2/UV system. The factors include concentration of H2O2, initial concentration of NO, concentration of O2, temperature of H2O2solution, concentration of a metalic catalyst, gas flow. Carrying on orthogonal test with the above 6 factors, determining the optimal value range of the various influencing factors and the optimal technical conditions are determined. When concentration of H2O2is 8%, concentration of O2is 5%, gas flow is 850ml/min, initial concentration of NO is 650mg/m3, temperature of H2O2solution is 55°C, the mole ratio of Fe2+is 1:300, then the NO removal is 88.6%. Based on this discussion and analysis, the H2O2/UV system of NO Removal system has certain technical popularization.

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