Pipe and Conduit Flow

2013 ◽  
pp. 505-508
Keyword(s):  
Conduit Flow

scholarly journals The Effects of Exchange Flow on the Karst Spring Hydrograph under the Different Flow Regimes: A Synthetic Modeling Approach

Water ◽  
2021 ◽  
Vol 13 (9) ◽  
pp. 1189
Author(s):  
Malihe Shirafkan ◽  
Zargham Mohammadi ◽  
Vianney Sivelle ◽  
David Labat
Keyword(s):  
Flow Regime ◽  
Spring Discharge ◽  
Exchange Flow ◽  
Flow Conditions ◽  
Spring Hydrograph ◽  
Conduit Flow ◽  
Discharge Fluctuations ◽  
Recession Coefficient ◽  
The Matrix ◽  
Synthetic Modeling

In this study, a synthetic modeling approach is proposed to quantify the effect of the amount and direction of the exchange flow on the karstic spring discharge fluctuations under different hydrologic conditions corresponding to high and low flow conditions. We hypothesis that the spring discharge fluctuations constitute a valuable proxy to understand the internal processes of the karst system. An ensemble of spring hydrographs was synthetically produced to highlight the effect of exchange flow by exploring the plausible range of variability of coefficients of exchange flow, conduit diameter, and matrix hydraulic conductivity. Moreover, the change of the rate of point recharge through the karst conduit allows for the quantifying of the sensibility of the spring hydrograph to the directions of exchange flow. We show that increasing the point recharge lies to a remarkable linear recession coefficient (β) as an indication of the conduit flow regime. However, a reduction in and/or lack of the point recharge caused the recession coefficient to change to exponential (α) due to the dominant effect of the matrix restrained flow regime and/or conduit-influenced flow regime. The simulations highlight that the exchange flow process from the conduit to the matrix occurred in a short period and over a restricted part of the conduit flow regime (CFR). Conversely, the exchange flow dumped from the matrix to the conduit occurs as a long-term process. A conceptual model is introduced to compare spring hydrographs’ characteristics (i.e., the peak discharge, the volume of baseflow, and the slope of the recession curve) under the various flow conditions with the directions of the exchange flow between the conduit and the matrix.

Removing woody vegetation has little effect on conduit flow recharge

Ecohydrology ◽  
2012 ◽  
Vol 6 (3) ◽  
pp. 435-443 ◽  
Author(s):  
Roberto A. Bazan ◽  
Bradford P. Wilcox ◽  
Clyde Munster ◽  
Marcus Gary
Keyword(s):  
Woody Vegetation ◽  
Conduit Flow

Evaluation of the MODFLOW-2005 Conduit Flow Process

Ground Water ◽  
2010 ◽  
Vol 48 (4) ◽  
pp. 549-559 ◽  
Author(s):  
Melissa E. Hill ◽  
Mark T. Stewart ◽  
Angel Martin
Keyword(s):  
Flow Process ◽  
Conduit Flow

The Transporting Mechanic of Slurry of Heavy Oil and Sand in Horizontal Wellbore

2012 ◽  
Vol 271-272 ◽  
pp. 641-644
Author(s):  
Deng Sheng Lei ◽  
Xiao Liang Huang ◽  
Chun Bi Xu
Keyword(s):  
Heavy Oil ◽  
Flow State ◽  
Conduit Flow ◽  
Drag Forces ◽  
Horizontal Wellbore ◽  
Sand Particles ◽  
The Difference

It is a special modality of solid-fluid conduit flow for the sand transporting procedure in wellbore. Under the action of heavy oil, because of the difference of the borehole location, the transporting mechanic of sand is not the same. For the vertical wellbore, sand particles are mainly dominated by the drag forces and carried out of the hole; however, for the horizontal wellbore, sand particles are under complex forces and show different flow state. In different flow state, the sand particles are controlled by different forces, the heavy oil’s sand transporting capacity is changed. This paper begins with the analysis of the stress of the sand particles, and deeply analyses the vertical and horizontal wellbore, the stress of sand particles in the heavy oil’s sand mixing flow procedure, and then study the heavy oil’s sand transporting capacity.

Influence of conduit flow mechanics on magma rheology and the growth style of lava domes

2018 ◽  
Vol 213 (3) ◽  
pp. 1768-1784 ◽  
Author(s):  
Taha Husain ◽  
Derek Elsworth ◽  
Barry Voight ◽  
Glen Mattioli ◽  
Pamela Jansma
Keyword(s):  
Conduit Flow ◽  
Lava Domes ◽  
Magma Rheology
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