Spatial Averaging of van Genuchten Hydraulic Parameters for Steady-State Flow in Heterogeneous Soils: A Numerical Study

2002 ◽  
Vol 1 (2) ◽  
pp. 261-272 ◽  
Author(s):  
J. Zhu ◽  
B. P. Mohanty
Keyword(s):  
Steady State ◽  
Numerical Study ◽  
Hydraulic Parameters ◽  
Spatial Averaging ◽  
Steady State Flow ◽  
State Flow ◽  
Heterogeneous Soils

An Experimental and Numerical Study of the Steady-State Flow of a SI-Engine Intake Port

1998 ◽  
Author(s):  
H. Bensler ◽  
C. Freek ◽  
B. Beesten ◽  
A. Ritter ◽  
A. W. Hentschel
Keyword(s):  
Steady State ◽  
Numerical Study ◽  
Intake Port ◽  
Steady State Flow ◽  
Si Engine ◽  
State Flow

Correspondence and Upscaling of Hydraulic Functions for Steady-State Flow in Heterogeneous Soils

2004 ◽  
Vol 3 (2) ◽  
pp. 527-533 ◽  
Author(s):  
Jianting Zhu ◽  
Binayak P. Mohanty ◽  
Arthur W. Warrick ◽  
Martinus Th. van Genuchten
Keyword(s):  
Steady State ◽  
Steady State Flow ◽  
State Flow ◽  
Heterogeneous Soils

Numerical Study of the Characteristics of Rotary Spool Orifice in Water Hydraulics

2014 ◽  
Vol 716-717 ◽  
pp. 662-669
Author(s):  
Jin Jun Wu ◽  
You Sheng Yang ◽  
Jing Yuan Li ◽  
Ge Gang Yu ◽  
Zong Xia Jiao
Keyword(s):  
Steady State ◽  
High Performance ◽  
Numerical Study ◽  
Tap Water ◽  
Control Valve ◽  
Control Element ◽  
Steady State Flow ◽  
Pressure Drops ◽  
State Flow ◽  
Depth Study

The rotary control orifice, in which the relative angular openings are adjusted by the rotary motion of the spool, thus controlling the flow area and the flow passing through, is a basic control element of hydraulic control valve. It has several advantages, such as little minimal steady flow rate, good anti-contamination, small driving power, small opening and shutting shock, and etc., over the translational control orifice. The working medium is tap water. A model is developed and numerical studies are carried out to investigate the hydrodynamic characteristics of the rotary control orifice, including flow and pressure field, flow characteristics, flow torque. The relationships between the flow and the pressure drops, the efflux angle and the angular openings, the steady-state flow torque and the pressure drops as well as the angular openings are obtained. The results show that a) the orifice geometries have great effects on the efflux angle and the steady-state flow torque; b) Under the same openings and flow direction, the efflux angle is almost constant under different pressure drops. It is larger for meter-in flow than for meter-out flow and decreases with the increase of openings; c) The steady-state flow torque (including meter-in flowTsfinand meter-out flowTsfout) is proportional to the pressure drops and first increases and then decreases with the increase of openings, finally reaches zero at the fully opened position; d) The friction moment is proportional to the rotary speed so as the transient flow induced moment to the rotary acceleration. The in-depth study of the drag moment of rotary control orifice helps to design high performance rotary servo valve for robots. The in-depth study of the rotary control orifice provides a basis for developing high performance rotary control valve.

Correspondence and Upscaling of Hydraulic Functions for Steady-State Flow in Heterogeneous Soils

2004 ◽  
Vol 3 (2) ◽  
pp. 527-533 ◽  
Author(s):  
J. Zhu ◽  
B. P. Mohanty ◽  
A. W. Warrick ◽  
M. Th. van Genuchten
Keyword(s):  
Steady State ◽  
Steady State Flow ◽  
State Flow ◽  
Heterogeneous Soils

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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