Evaluating errors in calculations of the discharge coefficient and discharge due to indirect measurement for a differential manometer

1995 ◽  
Vol 38 (1) ◽  
pp. 68-74
Author(s):  
V. G. Patrikeev ◽  
A. D. Kozlov ◽  
Yu. V. Mamonov ◽  
M. M. Frenklakh
Keyword(s):  
Discharge Coefficient ◽  
Indirect Measurement ◽  
Differential Manometer

The Study of the Effect of the Sill Slope on the Discharge Coefficient of the Labyrinth Weir

2014 ◽  
pp. 93-97
Author(s):  
Mohammad Ali Izadbakhsh
Keyword(s):  
Discharge Coefficient ◽  
Labyrinth Weir

Use of vent stack temperature as a feedforward variable for dissolver total titratable alkali (TTA) control

TAPPI Journal ◽  
2018 ◽  
Vol 17 (05) ◽  
pp. 261-269
Author(s):  
Wei Ren ◽  
Brennan Dubord ◽  
Jason Johnson ◽  
Bruce Allison
Keyword(s):  
Feedback Control ◽  
Current Practice ◽  
Feedforward Control ◽  
Control Variable ◽  
Indirect Measurement ◽  
Tight Control ◽  
Transfer Lines ◽  
Green Liquor ◽  
Process Dynamics ◽  
Downstream Processes

Tight control of raw green liquor total titratable alkali (TTA) may be considered an important first step towards improving the overall economic performance of the causticizing process. Dissolving tank control is made difficult by the fact that the unknown smelt flow is highly variable and subject to runoff. High TTA variability negatively impacts operational costs through increased scaling in the dissolver and transfer lines, increased deadload in the liquor cycle, under- and over-liming, increased energy consumption, and increased maintenance. Current practice is to use feedback control to regulate the TTA to a target value through manipulation of weak wash flow while simultaneously keeping dissolver density within acceptable limits. Unfortunately, the amount of variability reduction that can be achieved by feedback control alone is fundamentally limited by the process dynamics. One way to improve upon the situation would be to measure the smelt flow and use it as a feedforward control variable. Direct measurement of smelt flow is not yet possible. The use of an indirect measurement, the dissolver vent stack temperature, is investigated in this paper as a surrogate feedforward variable for dissolving tank TTA control. Mill trials indicate that significant variability reduction in the raw green liquor TTA is possible and that the control improvements carry through to the downstream processes.

The Effect of Manifold Cross-Flow on the Discharge Coefficient of Sharp-Edged Orifices

1997 ◽  
Vol 24 (1-3) ◽  
pp. 239-250 ◽  
Author(s):  
P. A. Strakey ◽  
K. M. Olson ◽  
Douglas G. Talley
Keyword(s):  
Discharge Coefficient ◽  
Cross Flow

A Robust ANN For Rotor Speed Indirect Measurement Of The Induction Machine

2016 ◽  
Author(s):  
Lucilene F. Mouzinho ◽  
João Viana da Fonseca Neto ◽  
Benedito A. Luciano ◽  
Raimundo Carlos S. Freire
Keyword(s):  
Induction Machine ◽  
Indirect Measurement ◽  
Rotor Speed

Measurements of the excess volume of benzene-methanol, benzene-acetonitrile and methanol-acetonitrile mixtures by a vibrating-tube densimeter

1979 ◽  
Vol 44 (2) ◽  
pp. 295-306 ◽  
Author(s):  
Ivan Cibulka ◽  
Vladimír Hynek ◽  
Robert Holub ◽  
Jiří Pick
Keyword(s):  
Excess Volume ◽  
Density Measurement ◽  
Indirect Measurement ◽  
Measuring System ◽  
Mean Error ◽  
Shaped Tube ◽  
Underlying Principle ◽  
The Mean ◽  
Vibrating Tube Densimeter

A digital vibrating-tube densimeter was constructed for measuring the density of liquids at several temperatures. The underlying principle of the apparatus is the measurement of the period of eigen-vibrations of a V-shaped tube; the second power of the period of the vibrations is proportional to the density of the liquid in the tube. The temperature of the measuring system is controlled by an electronic regulator. The mean error in the density measurement is approximately ±1 . 10-5 g cm-3 at 25 °C and ±2 . 10-5 g cm-3 at 40 °C. The apparatus was used for an indirect measurement of the excess volume, tested with the benzene-cyclohexane system and further used for determining the excess volume of the benzene-methanol, benzene-acetonitrile and methanol-acetonitrile systems at 25 and 40 °C.

scholarly journals On the Dragging Trajectory of Anchors in Clay for Merchant Ships

2021 ◽  
Vol 9 (2) ◽  
pp. 118
Author(s):  
Xinqing Zhuang ◽  
Keliang Yan ◽  
Pan Gao ◽  
Yihua Liu
Keyword(s):  
Mathematical Model ◽  
Structural Integrity ◽  
Indirect Measurement ◽  
Test System ◽  
Flow Rule ◽  
Burial Depth ◽  
Proposed Model ◽  
Depth Increase ◽  
Two Parameters ◽  
The Mathematical Model

Anchor dragging is a major threat to the structural integrity of submarine pipelines. A mathematical model in which the mechanical model of chain and the bearing model of anchor were coupled together. Based on the associated flow rule, an incremental procedure was proposed to solve the spatial state of anchor until it reaches the ultimate embedding depth. With an indirect measurement method for the anchor trajectory, a model test system was established. The mathematical model was validated against some model tests, and the effects of two parameters were studied. It was found that both the ultimate embedding depth of a dragging anchor and the distance it takes to reach the ultimate depth increase with the shank-fluke pivot angle, but decrease as the undrained shear strength of clay increases. The proposed model is supposed to be useful for the embedding depth calculation and guiding the design of the pipeline burial depth.

Approximation of the discharge coefficient of differential pressure flowmeters using different soft computing strategies

2021 ◽  
Vol 79 ◽  
pp. 101913
Author(s):  
Zhanat Dayev ◽  
Aiat Kairakbaev ◽  
Kaan Yetilmezsoy ◽  
Majid Bahramian ◽  
Parveen Sihag ◽  
...  
Keyword(s):  
Soft Computing ◽  
Discharge Coefficient ◽  
Differential Pressure
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