scholarly journals About the determination of the steady state flow for polymer melts in capillary rheometers

2001 ◽  
Vol 20 (5) ◽  
pp. 523-531 ◽  
Author(s):  
Leonor Pérez-Trejo ◽  
José Pérez-González ◽  
Lourdes de Vargas
Keyword(s):  
Steady State ◽  
Polymer Melts ◽  
Steady State Flow ◽  
State Flow

A Graphical Method for Storage Coefficient Determination from Quasi-Steady State Flow Data

1996 ◽  
Vol 27 (4) ◽  
pp. 247-254 ◽  
Author(s):  
Zekâi Şen
Keyword(s):  
Steady State ◽  
Graphical Method ◽  
Pumping Test ◽  
Quasi Steady State ◽  
Flow Data ◽  
Steady State Flow ◽  
Storage Coefficient ◽  
State Flow ◽  
Aquifer Test

A simple, approximate but practical graphical method is proposed for estimating the storage coefficient independently from the transmissivity value, provided that quasi-steady state flow data are available from a pumping test. In the past, quasi-steady state flow distance-drawdown data have been used for the determination of transmissivity only. The method is applicable to confined and leaky aquifers. The application of the method has been performed for various aquifer test data available in the groundwater literature. The results are within the practical limits of approximation compared with the unsteady state flow solutions.

A potential systematic error in laboratory testing of very loose sands

1987 ◽  
Vol 24 (3) ◽  
pp. 462-466 ◽  
Author(s):  
J. A. Sladen ◽  
G. Handford
Keyword(s):  
Steady State ◽  
Void Ratio ◽  
Flow Line ◽  
Simple Calculation ◽  
Triaxial Tests ◽  
Steady State Flow ◽  
Laboratory Procedure ◽  
State Flow ◽  
Potential Error

There is a potential error in the determination of specimen void ratio in triaxial tests on very loose sands. This error can be attributed to densification during final saturation. The result can be an error in the determination of the location of the steady state flow line in void ratio – stress space. Stress levels on the steady state flow line at a given void ratio may be in error by two orders of magnitude. If carried through to the analysis of susceptibility to liquefaction, this potential error could be extremely unconservative. Test results are presented that illustrate this potential source of error. A laboratory procedure is proposed that provides a simple calculation of final specimen void ratio and is potentially more accurate than presently used procedures. Key words: triaxial testing, sand, liquefaction, steady state.

Calibration 7" – Cutthroat Flume as New Size for Discharge Measurement at Free Flow Condition

2020 ◽  
Vol 38 (12A) ◽  
pp. 1783-1789
Author(s):  
Jaafar S. Matooq ◽  
Muna J. Ibraheem
Keyword(s):  
Steady State ◽  
Flow Condition ◽  
Laboratory Experiments ◽  
Free Flow ◽  
Experimental Program ◽  
Steady State Flow ◽  
Empirical Formulas ◽  
State Flow ◽  
Operation Conditions ◽  
Throat Width

 This paper aims to conduct a series of laboratory experiments in case of steady-state flow for the new size 7 ̋ throat width (not presented before) of the cutthroat flume. For this size, five different lengths were adopted 0.535, 0.46, 0.40, 0.325 and 0.27m these lengths were adopted based on the limitations of the available flume. The experimental program has been followed to investigate the hydraulic characteristic and introducing the calibrated formula for free flow application within the discharge ranged between 0.006 and 0.025 m3/s. The calibration result showed that, under suitable operation conditions, the suggested empirical formulas can accurately predict the values of discharge within an error ± 3%.

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