Flow behavior analysis of confined fluid in a flexible tube: application of asymptotic approach

In this paper, we asymptotically investigate a confined fluid flow in a flexible tube with a variable section. The fluid is considered to be newtonian, incompressible and it elapses in elastic and isotropic shell. This study provides a review of recent analysing the effects of the elastic wall tube properties over the fluid behaviour. The unsteady fluid flow will be analysed following the singular perturbations theory according to a large Reynolds number and a small aspect radio. The wall is assumed to be a thin shell that generate a small axisymmetric vibration. This model is mathematically developed by using the thin shell linear theory that is governed by a geodesic curvature parameter.

Download Full-text

Analytical Modeling of a Descending Aorta Containing Human Blood Flow

Defect and Diffusion Forum ◽

10.4028/www.scientific.net/ddf.384.117 ◽

2018 ◽

Vol 384 ◽

pp. 117-129 ◽

Cited By ~ 1

Author(s):

Mehdari Abdessamad ◽

Mohamed Hasnaoui ◽

Mohamed Agouzoul

Keyword(s):

Blood Flow ◽

Thin Shell ◽

Analytical Modeling ◽

Flow Behavior ◽

Geodesic Curvature ◽

Elastic Tube ◽

Axisymmetric Vibration ◽

Curvature Parameter ◽

Flow Through ◽

The Mathematical Model

In the recent years, blood flow through an aorta has been the main focus of many investigators. It shows particular interest in analyzing human aortic stiffness and blood flow behavior. Mainly, an unsteady state is applied for incompressible fluid, which is assumed to be newtonian. Artery is considered an elastic tube and the wall boundaries are isotropic. The analytical modeling of blood involves adopting an asymptotic approach according to a small aspect radio,which is inversely proportionalto Reynolds number. The wall has been assumed a thin shell, which generates a small axisymmetric vibration. The mathematical model of the wall is developed using the thin shell theory based on geodesic curvature parameter. In the end, the analytical results simulation is applied to have better understanding of the effects of blood flow behavior over the elasticity aortic wall properties.

Download Full-text

3D numerical simulation of a novel ventilated roof: thermal performance analysis and fluid flow behavior

Science and Technology for the Built Environment ◽

10.1080/23744731.2021.1917931 ◽

2021 ◽

pp. 1-14

Author(s):

Michele Calati ◽

Luca Doretti ◽

Claudio Zilio ◽

Simone Mancin

Keyword(s):

Numerical Simulation ◽

Fluid Flow ◽

Performance Analysis ◽

Thermal Performance ◽

Flow Behavior ◽

3D Numerical Simulation

Download Full-text

Effects of Nano-Nozzles Cross-Sectional Geometry on Fluid Flow: Molecular Dynamic Simulation

Journal of Mechanics ◽

10.1017/jmech.2017.29 ◽

2017 ◽

Vol 34 (5) ◽

pp. 667-678 ◽

Cited By ~ 1

Author(s):

H. Nowruzi ◽

H. Ghassemi

Keyword(s):

Fluid Flow ◽

Velocity Profile ◽

Cross Sections ◽

Md Simulation ◽

Flow Behavior ◽

Water Model ◽

Physical Parameters ◽

Cross Sectional ◽

Behavior Characteristics ◽

Fanning Friction Factor

AbstractNano-nozzles are an essential part of the nano electromechanical systems (NEMS). Cross-sectional geometry of nano-nozzles has a significant role on the fluid flow inside them. So, main purpose of the present study is related to the effects of different symmetrical cross-sections on the fluid flow behavior inside of nano-nozzles. To this accomplishment, five different cross-sectional geometries (equilateral triangle, square, regular hexagon, elliptical and circular) are investigated by using molecular dynamics (MD) simulation. In addition, TIP4P is used for atomistic water model. In order to evaluate the fluid flow behavior, non-dimensional physical parameters such as Fanning friction factor, velocity profile and density number are analyzed. Obtained results are shown that the flow behavior characteristics appreciably depend on the geometry of nano-nozzle's cross-section. Velocity profile and density number for five different cross sections of nano-nozzle at three various measurement gauges are presented and discussed.

Download Full-text

In Vitro Stain Transport in Canaliculi of Rat Femora Under Cyclic Loading

10.1115/imece2000-2585 ◽

2000 ◽

Author(s):

Bixia Li ◽

Timothy L. Norman

Keyword(s):

Fluid Flow ◽

Cyclic Loading ◽

Confocal Microscopy ◽

Mechanical Loading ◽

Cyclic Load ◽

Flow Behavior ◽

Load Level ◽

Static Conditions ◽

Rat Bone

Abstract In this study, rat femurs were used to test the diffusion and mechanical transport properties of a fluroscein stain tracer in microvessels of bone. Fluroscein was used as a tracer to visualize the fluid flow behavior using confocal microscopy. It was found that stain transport occurs due to diffusion under static conditions and due to mechanical loading. The transport increased with cyclic load level and frequency. Our results also show that stain transport at the canaliculi level occurs rapidly in rat bone.

Download Full-text