**Commenced**in January 2007

**Frequency:**Monthly

**Edition:**International

**Paper Count:**2101

# Search results for: radial velocity difference.

##### 2101 Evaluation of Carbon Dioxide Pressure through Radial Velocity Difference in Arterial Blood Modeled by Drift Flux Model

**Authors:**
Aicha Rima Cheniti,
Hatem Besbes,
Joseph Haggege,
Christophe Sintes

**Abstract:**

**Keywords:**
Mean carbon dioxide pressure,
mean mixture pressure,
mixture velocity,
radial velocity difference.

##### 2100 Measurements of Radial Velocity in Fixed Fluidized Bed for Fischer-Tropsch Synthesis Using LDV

**Authors:**
Xiaolai Zhang,
Haitao Zhang,
Qiwen Sun,
Weixin Qian,
Weiyong Ying

**Abstract:**

**Keywords:**
LDV,
fixed fluidized bed,
velocity,
Fischer-Tropsch
synthesis.

##### 2099 Cold Model Experimental Research on Particle Velocity Distribution in Gas-Solid Circulating Fluidized Bed for Methanol-to-Olefins Process

**Authors:**
Yongzheng Li,
Hongfang Ma,
Qiwen Sun,
Haitao Zhang,
Weiyong Ying

**Abstract:**

**Keywords:**
Circulating fluidized bed,
laser doppler velocimeter,
particle velocity,
radial profile.

##### 2098 Gas Pressure Evaluation through Radial Velocity Measurement of Fluid Flow Modeled by Drift Flux Model

**Authors:**
Aicha Rima Cheniti,
Hatem Besbes,
Joseph Haggege,
Christophe Sintes

**Abstract:**

In this paper, we consider a drift flux mixture model of the blood flow. The mixture consists of gas phase which is carbon dioxide and liquid phase which is an aqueous carbon dioxide solution. This model was used to determine the distributions of the mixture velocity, the mixture pressure, and the carbon dioxide pressure. These theoretical data are used to determine a measurement method of mean gas pressure through the determination of radial velocity distribution. This method can be applicable in experimental domain.

**Keywords:**
Mean carbon dioxide pressure,
mean mixture pressure,
mixture velocity,
radial velocity.

##### 2097 Group Invariant Solutions for Radial Jet Having Finite Fluid Velocity at Orifice

**Abstract:**

The group invariant solution for Prandtl-s boundary layer equations for an incompressible fluid governing the flow in radial free, wall and liquid jets having finite fluid velocity at the orifice are investigated. For each jet a symmetry is associated with the conserved vector that was used to derive the conserved quantity for the jet elsewhere. This symmetry is then used to construct the group invariant solution for the third-order partial differential equation for the stream function. The general form of the group invariant solution for radial jet flows is derived. The general form of group invariant solution and the general form of the similarity solution which was obtained elsewhere are the same.

**Keywords:**
Two-dimensional jets,
radial jets,
group invariant solution.

##### 2096 Flow of a Second Order Fluid through Constricted Tube with Slip Velocity at Wall Using Integral Method

**Authors:**
Nosheen Zareen Khan,
Abdul Majeed Siddiqui,
Muhammad Afzal Rana

**Abstract:**

**Keywords:**
Approximate solution,
constricted tube,
non-Newtonian fluids,
Reynolds number.

##### 2095 Acceleration Analysis of a Rotating Body

**Authors:**
R. Usubamatov

**Abstract:**

The velocity of a moving point in a general path is the vector quantity, which has both magnitude and direction. The magnitude or the direction of the velocity vector can change over time as a result of acceleration that the time rate of velocity changes. Acceleration analysis is important because inertial forces and inertial torques are proportional to rectilinear and angular accelerations accordingly. The loads must be determined in advance to ensure that a machine is adequately designed to handle these dynamic loads. For planar motion, the vector direction of acceleration is commonly separated into two elements: tangential and centripetal or radial components of a point on a rotating body. All textbooks in physics, kinematics and dynamics of machinery consider the magnitude of a radial acceleration at condition when a point rotates with a constant angular velocity and it means without acceleration. The magnitude of the tangential acceleration considered on a basis of acceleration for a rotating point. Such condition of presentation of magnitudes for two components of acceleration logically and mathematically is not correct and may cause further confusion in calculation. This paper presents new analytical expressions of the radial and absolute accelerations of a rotating point with acceleration and covers the gap in theoretical study of acceleration analysis.

**Keywords:**
acceleration analysis,
kinematics of mechanisms.

##### 2094 Handwriting Velocity Modeling by Artificial Neural Networks

**Authors:**
Mohamed Aymen Slim,
Afef Abdelkrim,
Mohamed Benrejeb

**Abstract:**

The handwriting is a physical demonstration of a complex cognitive process learnt by man since his childhood. People with disabilities or suffering from various neurological diseases are facing so many difficulties resulting from problems located at the muscle stimuli (EMG) or signals from the brain (EEG) and which arise at the stage of writing. The handwriting velocity of the same writer or different writers varies according to different criteria: age, attitude, mood, writing surface, etc. Therefore, it is interesting to reconstruct an experimental basis records taking, as primary reference, the writing speed for different writers which would allow studying the global system during handwriting process. This paper deals with a new approach of the handwriting system modeling based on the velocity criterion through the concepts of artificial neural networks, precisely the Radial Basis Functions (RBF) neural networks. The obtained simulation results show a satisfactory agreement between responses of the developed neural model and the experimental data for various letters and forms then the efficiency of the proposed approaches.

**Keywords:**
ElectroMyoGraphic (EMG) signals,
Experimental
approach,
Handwriting process,
Radial Basis Functions (RBF) neural
networks,
Velocity Modeling.

##### 2093 The Radial Pulse Wave and Blood Viscosity

**Authors:**
Hyunhee Ryu,
Young Ju Jeon,
Jaeuk U. Kim,
Hae Jung Lee,
Yu Jung Lee,
Jong Yeol Kim

**Abstract:**

The aim of this study was to investigate the effect of blood viscosity on the radial pulse wave. For this, we obtained the radial pulse wave of 15 males with abnormal high hematocrit level and 47 males with normal hematocrit level at the age of thirties and forties. Various variables of the radial pulse wave between two groups were analyzed and compared by Student's T test. There are significant differences in several variables about height, time and area of the pulse wave. The first peak of the radial pulse wave was higher in abnormal high hematocrit group, but the third peak was higher and longer in normal hematocrit group. Our results suggest that the radial pulse wave can be used for diagnosis of high blood viscosity and more clinical application.

**Keywords:**
Radial pulse wave,
Blood viscosity,
Hematocrit.

##### 2092 Velocity Filter Banks using 3-D FFT

**Authors:**
G. Koukiou,
V. Anastassopoulos

**Abstract:**

**Keywords:**
Velocity filters,
filter banks,
3-D FFT.

##### 2091 Dynamic Behavior of Brain Tissue under Transient Loading

**Authors:**
Y. J. Zhou,
G. Lu

**Abstract:**

In this paper, an analytical study is made for the dynamic behavior of human brain tissue under transient loading. In this analytical model the Mooney-Rivlin constitutive law is coupled with visco-elastic constitutive equations to take into account both the nonlinear and time-dependent mechanical behavior of brain tissue. Five ordinary differential equations representing the relationships of five main parameters (radial stress, circumferential stress, radial strain, circumferential strain, and particle velocity) are obtained by using the characteristic method to transform five partial differential equations (two continuity equations, one motion equation, and two constitutive equations). Analytical expressions of the attenuation properties for spherical wave in brain tissue are analytically derived. Numerical results are obtained based on the five ordinary differential equations. The mechanical responses (particle velocity and stress) of brain are compared at different radii including 5, 6, 10, 15 and 25 mm under four different input conditions. The results illustrate that loading curves types of the particle velocity significantly influences the stress in brain tissue. The understanding of the influence by the input loading cures can be used to reduce the potentially injury to brain under head impact by designing protective structures to control the loading curves types.

**Keywords:**
Analytical method,
mechanical responses,
spherical wave propagation,
traumatic brain injury.

##### 2090 Group Velocity Dispersion Management of Microstructure Optical Fibers

**Authors:**
S. M. Abdur Razzak,
M. A. Rashid,
Y. Namihira,
A. Sayeem

**Abstract:**

A simple microstructure optical fiber design based on an octagonal cladding structure is presented for simultaneously controlling dispersion and leakage properties. The finite difference method with anisotropic perfectly matched boundary layer is used to investigate the guiding properties. It is demonstrated that octagonal photonic crystal fibers with four rings can assume negative ultra-flattened dispersion of -19 + 0.23 ps/nm/km in the wavelength range of 1.275 μm to 1.68 μm, nearly zero ultra-flattened dispersion of 0 ± 0.40 ps/nm/km in a 1.38 to 1.64 μm, and low confinement losses less than 10-3 dB/km in the entire band of interest.

**Keywords:**
Finite difference modeling,
group velocity dispersion,
optical fiber design,
photonic crystal fiber.

##### 2089 A Localized Interpolation Method Using Radial Basis Functions

**Authors:**
Mehdi Tatari

**Abstract:**

Finding the interpolation function of a given set of nodes is an important problem in scientific computing. In this work a kind of localization is introduced using the radial basis functions which finds a sufficiently smooth solution without consuming large amount of time and computer memory. Some examples will be presented to show the efficiency of the new method.

**Keywords:**
Radial basis functions,
local interpolation method,
closed form solution.

##### 2088 A Finite Difference Calculation Procedure for the Navier-Stokes Equations on a Staggered Curvilinear Grid

**Authors:**
R. M. Barron,
B. Zogheib

**Abstract:**

**Keywords:**
Curvilinear,
finite difference,
finite volume,
SIMPLE.

##### 2087 Power Flow Analysis for Radial Distribution System Using Backward/Forward Sweep Method

**Authors:**
J. A. Michline Rupa,
S. Ganesh

**Abstract:**

This paper proposes a backward/forward sweep method to analyze the power flow in radial distribution systems. The distribution system has radial structure and high R/X ratios. So the newton-raphson and fast decoupled methods are failed with distribution system. The proposed method presents a load flow study using backward/forward sweep method, which is one of the most effective methods for the load-flow analysis of the radial distribution system. By using this method, power losses for each bus branch and voltage magnitudes for each bus node are determined. This method has been tested on IEEE 33-bus radial distribution system and effective results are obtained using MATLAB.

**Keywords:**
Backward/Forward sweep method,
Distribution
system,
Load flow analysis.

##### 2086 Numerical Simulation of Flow Field in a Elliptic Bottom Stirred Tank with Bottom Baffles

**Authors:**
Liu Xuedong ,
Liu Zhiyan

**Abstract:**

**Keywords:**
Bottom baffle,
Flow field,
Numerical simulation,
Stirred tank.

##### 2085 Velocity Distribution in Open Channels with Sand: An Experimental Study

**Authors:**
E. Keramaris

**Abstract:**

In this study, laboratory experiments in open channel flows over a sand bed were conducted. A porous bed (sand bed) with porosity of ε=0.70 and porous thickness of s΄=3 cm was tested. Vertical distributions of velocity were evaluated by using a two-dimensional (2D) Particle Image Velocimetry (PIV). Velocity profiles are measured above the impermeable bed and above the sand bed for the same different total water heights (h= 6, 8, 10 and 12 cm) and for the same slope S=1.5. Measurements of mean velocity indicate the effects of the bed material used (sand bed) on the flow characteristics (Velocity distribution and Reynolds number) in comparison with those above the impermeable bed.

**Keywords:**
Particle image velocimetry,
sand bed,
velocity distribution,
Reynolds number.

##### 2084 Computer-Aided Analysis of Flow in a Rotating Single Disk

**Authors:**
Mohammad Shanbghazani,
Vahid Heidarpour,
Iraj Mirzaee

**Abstract:**

**Keywords:**
Rotating disk,
Laminar flow,
Numerical,
Momentum

##### 2083 Experimental Investigation of Phase Distributions of Two-phase Air-silicone Oil Flow in a Vertical Pipe

**Authors:**
M. Abdulkadir,
V. Hernandez-Perez,
S. Sharaf,
I. S. Lowndes,
B. J. Azzopardi

**Abstract:**

**Keywords:**
WMS,
phase distribution,
silicone-oil,
riser

##### 2082 The Design of Axisymmetric Ducts for Incompressible Flow with a Parabolic Axial Velocity Inlet Profile

**Authors:**
V.Pavlika

**Abstract:**

In this paper a numerical algorithm is described for solving the boundary value problem associated with axisymmetric, inviscid, incompressible, rotational (and irrotational) flow in order to obtain duct wall shapes from prescribed wall velocity distributions. The governing equations are formulated in terms of the stream function ψ (x,y)and the function φ (x,y)as independent variables where for irrotational flow φ (x,y)can be recognized as the velocity potential function, for rotational flow φ (x,y)ceases being the velocity potential function but does remain orthogonal to the stream lines. A numerical method based on the finite difference scheme on a uniform mesh is employed. The technique described is capable of tackling the so-called inverse problem where the velocity wall distributions are prescribed from which the duct wall shape is calculated, as well as the direct problem where the velocity distribution on the duct walls are calculated from prescribed duct geometries. The two different cases as outlined in this paper are in fact boundary value problems with Neumann and Dirichlet boundary conditions respectively. Even though both approaches are discussed, only numerical results for the case of the Dirichlet boundary conditions are given. A downstream condition is prescribed such that cylindrical flow, that is flow which is independent of the axial coordinate, exists.

**Keywords:**
Inverse problem,
irrotational incompressible flow,
Boundary value problem.

##### 2081 On a New Nonlinear Sum-difference Inequality with Application

**Authors:**
Kelong Zheng,
Shouming Zhong

**Abstract:**

**Keywords:**
Sum-Difference inequality,
Nonlinear,
Boundedness.

##### 2080 A Simple Approach of Three phase Distribution System Modeling for Power Flow Calculations

**Authors:**
J. B. V. Subrahmanyam,
C. Radhakrishna

**Abstract:**

**Keywords:**
radial distribution networks,
load flow,
circuitmodel,
three-phase four-wire,
unbalance.

##### 2079 Distributed Generator Placement and Sizing in Unbalanced Radial Distribution System

**Authors:**
J. B. V. Subrahmanyam,
C. Radhakrishna

**Abstract:**

**Keywords:**
Distributed generator,
unbalanced radial distributionsystem,
voltage index analysis,
variational algorithm.

##### 2078 CFD Simulation of Solid-Liquid Stirred Tank with Rushton Turbine and Propeller Impeller

**Authors:**
M. H. Pour,
V. M. Nansa,
M. Saberi,
A. M. Ghanadi,
A. Aghayari,
M. Mirzajanzadeh

**Abstract:**

**Keywords:**
CFD,
Particle Velocity,
Propeller Impeller,
Rushton Turbine.

##### 2077 Low Air Velocity Measurement Characteristics- Variation Due to Flow Regime

**Authors:**
A. Pedišius,
V. Janušas,
A. Bertašienė

**Abstract:**

The paper depicts air velocity values, reproduced by laser Doppler anemometer (LDA) and ultrasonic anemometer (UA), relations with calculated ones from flow rate measurements using the gas meter which calibration uncertainty is ± (0.15 – 0.30) %. Investigation had been performed in channel installed in aerodynamical facility used as a part of national standard of air velocity. Relations defined in a research let us confirm the LDA and UA for air velocity reproduction to be the most advantageous measures. The results affirm ultrasonic anemometer to be reliable and favourable instrument for measurement of mean velocity or control of velocity stability in the velocity range of 0.05 m/s – 10 (15) m/s when the LDA used. The main aim of this research is to investigate low velocity regularities, starting from 0.05 m/s, including region of turbulent, laminar and transitional air flows. Theoretical and experimental results and brief analysis of it are given in the paper. Maximum and mean velocity relations for transitional air flow having unique distribution are represented. Transitional flow having distinctive and different from laminar and turbulent flow characteristics experimentally have not yet been analysed.

**Keywords:**
Laser Doppler anemometer,
ultrasonic anemometer,
air flow velocities,
transitional flow regime,
measurement,
uncertainty.

##### 2076 Forming the Differential-Algebraic Model of Radial Power Systems for Simulation of both Transient and Steady-State Conditions

**Authors:**
Saleh A. Al-Jufout

**Abstract:**

**Keywords:**
Mathematical Modelling,
Radial Power System,
Steady-State,
Transients

##### 2075 Error Correction of Radial Displacement in Grinding Machine Tool Spindle by Optimizing Shape and Bearing Tuning

**Authors:**
Khairul Jauhari,
Achmad Widodo,
Ismoyo Haryanto

**Abstract:**

**Keywords:**
Error correction,
High precision grinding,
Optimization,
Radial displacement,
Spindle.

##### 2074 Despiking of Turbulent Flow Data in Gravel Bed Stream

**Authors:**
Ratul Das

**Abstract:**

The present experimental study insights the decontamination of instantaneous velocity fluctuations captured by Acoustic Doppler Velocimeter (ADV) in gravel-bed streams to ascertain near-bed turbulence for low Reynolds number. The interference between incidental and reflected pulses produce spikes in the ADV data especially in the near-bed flow zone and therefore filtering the data are very essential. Nortek’s Vectrino four-receiver ADV probe was used to capture the instantaneous three-dimensional velocity fluctuations over a non-cohesive bed. A spike removal algorithm based on the acceleration threshold method was applied to note the bed roughness and its influence on velocity fluctuations and velocity power spectra in the carrier fluid. The velocity power spectra of despiked signals with a best combination of velocity threshold (VT) and acceleration threshold (AT) are proposed which ascertained velocity power spectra a satisfactory fit with the Kolmogorov “–5/3 scaling-law” in the inertial sub-range. Also, velocity distributions below the roughness crest level fairly follows a third-degree polynomial series.

**Keywords:**
Acoustic Doppler Velocimeter,
gravel-bed,
spike removal,
Reynolds shear stress,
near-bed turbulence,
velocity power spectra.

##### 2073 Characteristics of Turbulent Round Jets in its Potential-Core Region

**Authors:**
S. Sivakumar,
Ravikiran Sangras,
Vasudevan Raghavan

**Abstract:**

**Keywords:**
Contoured nozzle,
hot-wire anemometer,
Reynolds
number,
velocity fluctuations,
velocity spectra.

##### 2072 Face Recognition using Radial Basis Function Network based on LDA

**Authors:**
Byung-Joo Oh

**Abstract:**

This paper describes a method to improve the robustness of a face recognition system based on the combination of two compensating classifiers. The face images are preprocessed by the appearance-based statistical approaches such as Principal Component Analysis (PCA) and Linear Discriminant Analysis (LDA). LDA features of the face image are taken as the input of the Radial Basis Function Network (RBFN). The proposed approach has been tested on the ORL database. The experimental results show that the LDA+RBFN algorithm has achieved a recognition rate of 93.5%

**Keywords:**
Face recognition,
linear discriminant analysis,
radial basis function network.