scholarly journals Fluid Flow in Tree-Shaped Constructal Networks: Porosity, Permeability and Inertial Parameter

2010 ◽  
Vol 297-301 ◽  
pp. 408-412 ◽  
Author(s):  
Antonio F. Miguel
Keyword(s):  
Fluid Flow ◽  
Flow Structure ◽  
Flow Structures ◽  
Hydraulic Permeability ◽  
Flow Networks ◽  
Circular Area ◽  
Ongoing Research ◽  
Inertial Parameter ◽  
Ergun Equation ◽  
Physical Description

This paper aims to contribute to the ongoing research on tree-shaped flow structures. First, it briefly traces the progress made on constructal tree-shaped flow networks. Then, the paper focuses on tree pattern of tubes connecting the centre and the rim of a circular area. It shows that the physical description underlying the classical Darcy-Forchheimer-Ergun equation may provide a legitimate correlation for this kind of flow structure. The porosity, hydraulic permeability and the inertial factor of the flow structure are also presented.

scholarly journals Fluid flow structures in an evaporating sessile droplet depending on the droplet size and properties of liquid and substrate

2021 ◽  
Vol 1730 (1) ◽  
pp. 012029
Author(s):  
M.N. Turchaninova ◽  
E.S. Melnikova ◽  
A.A. Gavrilina ◽  
L.Yu. Barash
Keyword(s):  
Fluid Flow ◽  
Droplet Size ◽  
Flow Structures ◽  
Sessile Droplet

Fluid Flow Structure in Arterial Bypass Anastomosis

2005 ◽  
Vol 127 (4) ◽  
pp. 611-618 ◽  
Author(s):  
C. M. Su ◽  
D. Lee ◽  
R. Tran-Son-Tay ◽  
W. Shyy
Keyword(s):  
Fluid Flow ◽  
Flow Structure ◽  
Bypass Graft ◽  
Flow Characteristics ◽  
Navier Stokes ◽  
Complex Flow ◽  
Arterial Bypass ◽  
Flow Recirculation ◽  
Area Reduction ◽  
Complex Flow Structure

The fluid flow through a stenosed artery and its bypass graft in an anastomosis can substantially influence the outcome of bypass surgery. To help improve our understanding of this and related issues, the steady Navier-Stokes flows are computed in an idealized arterial bypass system with partially occluded host artery. Both the residual flow issued from the stenosis—which is potentially important at an earlier stage after grafting—and the complex flow structure induced by the bypass graft are investigated. Seven geometric models, including symmetric and asymmetric stenoses in the host artery, and two major aspects of the bypass system, namely, the effects of area reduction and stenosis asymmetry, are considered. By analyzing the flow characteristics in these configurations, it is found that (1) substantial area reduction leads to flow recirculation in both upstream and downstream of the stenosis and in the host artery near the toe, while diminishes the recirculation zone in the bypass graft near the bifurcation junction, (2) the asymmetry and position of the stenosis can affect the location and size of these recirculation zones, and (3) the curvature of the bypass graft can modify the fluid flow structure in the entire bypass system.

Hydraulic permeability of multilayered collagen gel scaffolds under plastic compression-induced unidirectional fluid flow

2013 ◽  
Vol 9 (1) ◽  
pp. 4673-4680 ◽  
Author(s):  
Vahid Serpooshan ◽  
Thomas M. Quinn ◽  
Naser Muja ◽  
Showan N. Nazhat
Keyword(s):  
Fluid Flow ◽  
Collagen Gel ◽  
Hydraulic Permeability ◽  
Plastic Compression

scholarly journals OBSERVATIONS OF CANOPY FLOW STRUCTURE AND FRICTIONAL VELOCITY OF CORAL COLONIES IN DONGSHA ATOLL

2018 ◽  
pp. 15
Author(s):  
Zhi-Cheng Huang ◽  
Wen-Yang Hsu ◽  
Jay Yang
Keyword(s):  
Flow Structure ◽  
Morphological Evolution ◽  
Field Measurements ◽  
Flow Structures ◽  
Doppler Velocity ◽  
Benthic Organism ◽  
Boundary Layer Flows ◽  
Canopy Layer ◽  
Drag Forces ◽  
Flow Motion

Understanding the hydrodynamics is important for biological, ecological, and biogeochemical processes in coral reef systems. The near-bed flow motion affects the benthic organism distributions, morphological evolution, larvae settlement, and nutrient uptake. The near-bed flow structures have been characterized as planar boundary-layer flows when the bottom roughness scale created by benthic organisms is much smaller than the water depth. On the other hand, when the bottom roughness scale becomes much larger, the resistance drag forces caused by these canopy elements should be considered (Rosman and Hench, 2011). The form drag of the multiple coral colonies generates turbulent wakes, enhances turbulent mixing, and changes the flow structure (Huang, 2015). Many laboratory and modeling studies have reported the drag parameterization and the flow structure for unidirectional flows through submerged canopy or vegetation (e.g., Finnigan, 2000; among many others). However, the vertical flow structures of the canopy layer caused by coral colonies (bommies) are rarely reported in fields. Here we present field measurements of flow structure over coral colonies using acoustic Doppler velocimetry (ADV) and pulse-coherent Doppler velocity profiler (PCADP) techniques. The measured current profiles and turbulence are used to study the flow dynamics in the canopy-layer created by coral colonies.

scholarly journals Resilience in hierarchical fluid flow networks

2019 ◽  
Vol 99 (1) ◽  
Author(s):  
Tatyana Gavrilchenko ◽  
Eleni Katifori
Keyword(s):  
Fluid Flow ◽  
Flow Networks
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