scholarly journals Influence of flowing fluid property through an elastic tube on various deformations along the tube length

2019 ◽  
Vol 31 (10) ◽  
pp. 101905 ◽  
Author(s):  
Samsun Nahar ◽  
Bipro N. Dubey ◽  
Erich J. Windhab
Keyword(s):  
Elastic Tube ◽  
Tube Length ◽  
Flowing Fluid ◽  
Fluid Property

MEASUREMENT OF FLOW IN CIRCULAR ELASTIC TUBE

2015 ◽  
Vol 76 (10) ◽  
Author(s):  
Muhamad Mazwan Mahat ◽  
Salmiah Kasolang ◽  
Izdihar Tharazi ◽  
R. Nazirul Izzati
Keyword(s):  
Structural Parameters ◽  
Circulatory System ◽  
Elastic Tube ◽  
Tube Length ◽  
Working Fluid ◽  
Circulatory Support ◽  
Pump System ◽  
Initial Work ◽  
Impedance Pump ◽  
Set Up

 Impedance pump is a simple valveless pumping mechanism which typically used in viscosity measurement device to assist pumping of fluid. It is typically connected to an elastic tube in a circulatory system of a more rigid tube. In conventional mechanical circulatory support systems using rotary pump, the pumping mechanism was exposed to turbulent stresses. Hence,  this may cause damage to blood cells flowing through the impeller. There has been initial work on finding alternative solution using the impedance pump system. However,  substantial findings are not yet sufficient to fully understand the mechanism. The purpose of this research is to extend the investigation on impedance pump by specifically looking at the effect of structural parameters on the elastic tube and the flow behaviour. In this study, a closed loop impedance pump system was set up to demonstrate blood flow circulatory system where the mixture of glycerine and water was used as the working fluid. Three variables were regulated namely voltage, tube thickness, and tube length was used in order to get the flowrate of the working fluid. Based on the results, it was found that  tube thickness of 1 mm and a length of 200 mm had produced the highest flowrate in the region 75 ml/min.

Strain Energy Release Rates for Crack Growth in an Elastic Cylinder Subjected to Axial Shear

1993 ◽  
Vol 66 (5) ◽  
pp. 712-732 ◽  
Author(s):  
A. N. Gent ◽  
Chi Wang
Keyword(s):  
Energy Release ◽  
Elastic Material ◽  
Strain Energy ◽  
Strain Energy Release ◽  
Elastic Tube ◽  
Tube Length ◽  
Release Rates ◽  
The Core ◽  
Energy Release Rates ◽  
Strain Energy Release Rates

Abstract Strain energy release rates have been calculated by finite element analysis (FEA) for various modes of failure of a long cylindrical elastic tube bonded between a rigid cylindrical core and a rigid surrounding tube. The core is subjected to an axial load so that the elastic tube is sheared. Fracture loads have been calculated for cracks propagating either along the interface or into the elastic material, at 45° to the interface, using linear elastic fracture mechanics and computed strain energy release rates. They are derived in terms of the initial crack size, the interfacial or bulk fracture energy, and the shear modulus of the elastic material. For an interfacial crack the failure load was found to be proportional to the tube length, the square root of the core radius, and a decreasing function of the elastic tube thickness, Ro/Ri. For a 45° crack, the presence of the rigid surrounding tube stabilized the crack at a certain size and an increasing load was needed to cause further growth. It is concluded that interfacial cracks are the most likely mode of failure.

Modulus of Elasticity of Elastic Tubes Used in Neuromuscular Rehabilitation Programs

2021 ◽  
pp. 1-6
Author(s):  
Andrea Lucena Reis ◽  
Thaís Lucena Reis ◽  
Lucas Soares de Aguiar ◽  
José de Jesus Soares Reis ◽  
Thiago Lucena Reis ◽  
...  
Keyword(s):  
Elastic Constant ◽  
Correlation Coefficient ◽  
Intraclass Correlation Coefficient ◽  
Coefficient Of Variation ◽  
Intraclass Correlation ◽  
Elastic Tube ◽  
Tube Length ◽  
Length Variation ◽  
Rehabilitation Programs ◽  
Elastic Tubes

Context: The elastic tubes have been used for clinical rehabilitation programs in which exercises are performed with submaximal intensities due to the difficulty in the measure the applied force. The authors aimed to quantify the elastic constant of elastic tubes used in neuromuscular rehabilitation programs predicting the force related to elastic tube elongation. A force test was performed by stretching the elastic tubes to determine the relationship between force and elongation. Eight elastic tubes with progressive levels of resistance represented by colors (yellow, red, blue, gray, black, grape, purple, and gold—low to higher resistance) were used. Design: Experimental. Methods: The test and retest were compared using the paired t test. The agreement and reliability between the test versus retest of pooled means colors were analyzed by plotting the Bland–Altman graph and intraclass correlation coefficient and the coefficient of variation. Pearson correlation was used to verify the validity between measurements. Results: The force values generated from the elastic tube elongation increase according to the color and thickness of elastic tubes with a strong and significant association between them (P < .0001). The elastic constant measurements were similar and presented high intraclass correlation coefficient values, low coefficient of variation values, and were reproducible (P < .0001). Conclusions: The force could be quantified according to elastic tube length variation by the linear regression equation with reproducibility. It gives greater measurement precision and better training load control when using elastic tubes in strength training programs.

Nonlinear regimes of variation of the shape of an elastic tube containing a flowing fluid

2000 ◽  
Vol 35 (4) ◽  
pp. 507-514
Author(s):  
B. N. Klochkov ◽  
E. A. Kuznetsova
Keyword(s):  
Elastic Tube ◽  
Flowing Fluid ◽  
Nonlinear Regimes

Boundary Element Analysis of Bubble Oscillations in Elastic Tubes

2015 ◽  
Author(s):  
Tatsuya Kitahara ◽  
Nariki Makihara ◽  
Toshiyuki Ogasawara ◽  
Hiroyuki Takahira
Keyword(s):  
Resonance Frequency ◽  
Tube Wall ◽  
Translational Motion ◽  
Harmonic Oscillation ◽  
Elastic Tube ◽  
Tube Length ◽  
Mass System ◽  
Elastic Tubes ◽  
Initial Location ◽  
Bubble Oscillations

The interactions between a microbubble and ultrasound in an elastic tube are investigated to understand the bubble dynamics in a blood vessel. The tube wall is modeled with a spring-mass system. A simple bubble model for investigating bubble oscillations in the tube is introduced and is combined with the spring-mass system of the tube: the bubble is represented by a point source for the bubble volume oscillation and a dipole for the translational motion. The natural frequencies of the system are derived by linearizing the governing equations. The influences of an elastic tube on a bubble are mainly discussed by using eigenvalue analysis in the present work. It is shown that the resonance frequency of a bubble in the tube decreases with increasing the mass of the tube wall. The effects of the tube length and the initial location of a bubble are also investigated. The results show that although the resonance frequency decreases monotonically with increase in the tube length when the wall mass is large, it is not changed when the mass is sufficiently small. It is also shown that the resonance frequency is decreased with decreasing the distance between the bubble centroid and the tube wall when the mass is large. However, when the mass is small enough, it is increased with decreasing the distance. We also investigate the influence of the characteristics of an elastic tube on nonlinear oscillations of a bubble. The condition that the harmonic oscillation is enhanced is discussed.

FLUID PROPERTY VARIATION ANALYSIS IN A HEAT EXCHANGER USING SUPERCRITICAL FLUIDS

2020 ◽  
Author(s):  
K H Jyothiprakash ◽  
Agniv Saha ◽  
Arihant Kumar Patawari ◽  
K. N. Seetharamu
Keyword(s):  
Heat Exchanger ◽  
Supercritical Fluids ◽  
Variation Analysis ◽  
Property Variation ◽  
Fluid Property

scholarly journals EFFECT OF TUBE PITCH ON HEAR TRANSFER IN SPRINKLED TUBE BUNDLE

2015 ◽  
Vol 55 (5) ◽  
pp. 329 ◽  
Author(s):  
Petr Kracík ◽  
Jiří Pospíšil
Keyword(s):  
Flow Rate ◽  
Tube Bundle ◽  
Thin Liquid Film ◽  
Thermal Conditions ◽  
Tube Length ◽  
Falling Film ◽  
Constant Flow Rate ◽  
Physical Conditions ◽  
The Individual ◽  
Tube Pitch

Water flowing on a sprinkled tube bundle forms three basic modes: the Droplet mode (the liquid drips from one tube to another), the Jet mode (with an increasing flow rate, the droplets merge into a column) and the Membrane (Sheet) mode (with a further increase in the flow rate of the falling film liquid, the columns merge and create sheets between the tubes. With a sufficient flow rate, the sheets merge at this stage, and the tube bundle is completely covered by a thin liquid film). There are several factors influencing both the individual modes and the heat transfer. Beside the above-mentioned falling film liquid flow rate, these are for instance the tube diameters, the tube pitches in the tube bundle, or the physical conditions of the falling film liquid. This paper presents a summary of data measured at atmospheric pressure, with a tube bundle consisting of copper tubes of 12 millimetres in diameter, and with a studied tube length of one meter. The tubes are situated horizontally one above another at a pitch of 15 to 30 mm, and there is a distribution tube placed above them with water flowing through apertures of 1.0mm in diameter at a 9.2mm span. Two thermal conditions have been tested with all pitches: 15 °C to 40 °C and 15 °C to 45 °C. The temperature of the falling film liquid, which was heated during the flow through the exchanger, was 15 °C at the distribution tube input. The temperature of the heating liquid at the exchanger input, which had a constant flow rate of approx. 7.2. litres per minute, was 40 °C, or alternatively 45 °C.

Design calculation model of oil fluid property parameter knowledge database for production logging

2020 ◽  
Vol 20 (3) ◽  
pp. 951-958
Author(s):  
Wenguang Song ◽  
Qiongqin Jiang
Keyword(s):  
Crude Oil ◽  
Expert Knowledge ◽  
Calculation Model ◽  
Physical Parameters ◽  
Base System ◽  
Design Calculation ◽  
Calculation Methods ◽  
Fluid Property ◽  
Knowledge Base System ◽  
Parameter Values

The fluid property parameter calculation affects the accuracy of the interpretation the accuracy, in the interpretation of the liquid production profile. Therefore, it is particularly important to accurately calculate the physical property parameter values, in the establishment of the fluid property parameter expert knowledge base system. The main physical parameters include the following calculation methods of the oil. The oil property parameter conversion formula mainly studies the formulas such as bubble point pressure, dissolved gas-oil ratio, crude oil volume coefficient, crude oil density, crude oil viscosity, and crude oil compression coefficient. Design expert knowledge base system, it is based on the calculation methods of these physical parameters. A computational fluid property parameter model is constructed by training production log sample data. Finally, the interactive and friendly product interpretation software model was developed in 9 wells’ data. The design calculation model can increase the accuracy to achieve 95% of oil fluid property parameter. Accurately calculate fluid property parameter values.

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