The document discusses an experimental study of electro-acoustic coupling in porous oil-water systems and the role of liquid micro-menisci. The goal is to analyze the role of liquid micro-menisci in both the electro-seismic effect and inverse electro-seismic effect. A series of controlled experiments are designed to observe the dynamics of micro-menisci under an applied pressure and the resulting acoustic and electric fields. Experimental data is fitted to numerical models to calculate the curvature of liquid menisci and verify the Laplace equation relating pressure and curvature. The results provide insight into nonlinear electro-seismic coupling involving oil-water micro-menisci.
The Force Convection Heat Transfer of A Nanofluid Over A Flat Plate: Using Th...AEIJjournal2
A drift-flux model is utilized to theoretically analyze the boundary layer flow and heat transfer of a
nanofluid over a flat plate. The concentration of nanoparticles at the plate is obtained using the solution of
the governing equations. Assuming a fixed magnitude of free stream velocity, the results show that the heat
transfer may enhance up to 22% or decrease about -7% by using nanofluids compared to the pure base
fluid.
The Force Convection Heat Transfer of A Nanofluid Over A Flat Plate: Using Th...AEIJjournal2
A drift-flux model is utilized to theoretically analyze the boundary layer flow and heat transfer of a
nanofluid over a flat plate. The concentration of nanoparticles at the plate is obtained using the solution of
the governing equations. Assuming a fixed magnitude of free stream velocity, the results show that the heat
transfer may enhance up to 22% or decrease about -7% by using nanofluids compared to the pure base
fluid.
The Effect of High Zeta Potentials on the Flow Hydrodynamics in Parallel-Plat...CSCJournals
This paper investigates the effect of the EDL at the solid-liquid interface on the liquid flow through a micro-channel formed by two parallel plates. The complete Poisson-Boltzmann equation (without the frequently used linear approximation) was solved analytically in order to determine the EDL field near the solid-liquid interface. The momentum equation was solved analytically taking into consideration the electrical body force resulting from the EDL field. Effects of the channel size and the strength of the zeta-potential on the electrostatic potential, the streaming potential, the velocity profile, the volume flow rate, and the apparent viscosity are presented and discussed. Results of the present analysis, which are based on the complete Poisson-Boltzmann equation, are compared with a simplified analysis that used a linear approximation of the Poisson-Boltzmann equation.
The understanding of two-phase flow and heat transfer
with phase change in minichannels is needed for the design and
optimization of heat exchangers and other industrial
applications. In this study a three-dimensional numerical model
has been developed to predict filmwise condensation heat
transfer inside a rectangular minichannel. The Volume of Fluid
(VOF) method is used to track the vapor-liquid interface. The
modified High Resolution Interface Capture (HRIC) scheme is
employed to keep the interface sharp. The governing equations
and the VOF equation with relevant source terms for
condensation are solved. The surface tension is taken into
account in the modeling and it is evaluated by the Continuum
Surface Force (CSF) approach. The simulation is performed
using the CFD software package, ANSYS FLUENT, and an inhouse
developed code. This in-house code is specifically
developed to calculate the source terms associated with phase
change. These terms are deduced from Hertz-Knudsen equation
based on the kinetic gas theory. The numerical results are
validated with data obtained from the open literature. The
standard k-ω model is applied to model the turbulence through
both the liquid and vapor phase. The numerical results show
that surface tension plays an important role in the condensation
heat transfer process. Heat transfer enhancement is obtained
due to the presence of the corners. The surface tension pulls the
liquid towards the corners and reduces the average thermal
resistance in the cross section.
Numerical Simulation and Prediction for Steep Water Gravity Waves of Arbitrar...CSCJournals
Nonlinear permanent progressive wave is one of the most important applications in water waves. In this study, analytic formulation of the steep water gravity waves is presented. Abohadima and Isobe [1] showed that Cokelet solution [2] is the most accurate among many other solutions. Due to the nonlinearity of analytic equations, the need to numeric simulation is raised up. In the current paper, consequence numerical models, using one of the artificial intelligence techniques, are designed to simulate and then predict the non linear properties of permanent steep water waves. Artificial Neural Network (ANN), one of the artificial intelligence techniques, is introduced in the current paper to simulate and predict the wave celerity, momentum, energy and other wave integral properties for any permanent waves in water of arbitrary uniform depth. The ANN results presented in the current study showed that ANN technique, with less effort, is very efficiently capable of simulating and predicting the non linear properties of permanent steep water waves.
Interaction of Components in Molecular Optoelectronics for the Next Generati...Scientific Review SR
The interaction of molecular optoelectronic components on the molecular scale were studied where
the solvent shell indicating the influence of the medium was found to be surprisingly small. The transport of
energy as resonant energy transfer covers distances of about 5 nm and was shown not to proceed by a simple to
dipole dipole interaction with typical restrictions, but by a more complex mechanism. Furthermore, a novel -type of
far-reaching interactions of electronically excited structures until macroscopic dimensions were fond and may be
applied for addressing molecular structures by conventional electronics
DISPERSION OF AEROSOLS IN ATMOSPHERIC FLUID FLOWijscmcj
A mathematical model is presented in this paper to study the dispersion of aerosols with and
without chemical reaction in the presence of electric and magnetic field. The Taylor dispersion
coefficient is determined and are numerically computed for different values of reaction rate,
electric and Hartmann numbers. The results are depicted graphically and conclusions are drawn
in the final section.
Moisture content investigation in the soil samples using microwave dielectric...IJECEIAES
The microwaves of typical frequency ranges of 3 GHz to 30 GHz have been in use for remote sensing applications which are progressing rapidly. The microwaves can sense existing moisture in any material that absorbs moisture such as soil or vegetation. In case of soils which may be comprised of variable mix proportionate of solids, liquids or gases and distinct textures subjected to the associated size and the arrangements of soil particles. Hence, the moisture absorption by a specific type of soil used to be different. The inherent physical and electrical properties such as color, texture, grains, dielectric constant, conductivity or permeability, etc. differentiate various soils. In this work, authors present soil moisture measurement by simple estimation of emissivity i.e. the ratio of energy radiated by an object to absorbing the body of same physical temperature. A strategic method of measuring dielectric constant using a microwave signal is used in this research work. The measurement of the dielectric constant of the soils collected from the specific regions and analysis of results has been reported. The proposed method is less complex and can further be used for the identification of soil moisture and agricultural applications.
Experimental Study of an Atmospheric Pressure Dielectric Barrier Discharge an...IJERA Editor
A homogeneous dielectric barrier discharge (DBD) in argon was produced by applying high voltage A.C. source of potential difference (0-20) kV operating at a frequency of 10-30 kHz across two parallel plate electrodes with glass as dielectric barrier. The discharge was characterized by optical emission spectroscopy (OES) and electrical measurement. Four argon emission lines from the discharge were analyzed and the electron temperature was estimated by line intensity ratio method. The electron density in the discharge was estimated by power balance method. An investigation of the effect of inter-electrode distance on the electron density was made. The results showed that the electron temperature is less than 1 eV and the electron density is of the order of 1011cm-3 which varied with the inter electrode distance. Discharge was applied for surface modification of polyethylene terepthalate (PET). Modified surfaces were studied by contact angle measurement and FTIR spectroscopy.
Experimental Study of an Atmospheric Pressure Dielectric Barrier Discharge an...IJERA Editor
A homogeneous dielectric barrier discharge (DBD) in argon was produced by applying high voltage A.C. source of potential difference (0-20) kV operating at a frequency of 10-30 kHz across two parallel plate electrodes with glass as dielectric barrier. The discharge was characterized by optical emission spectroscopy (OES) and electrical measurement. Four argon emission lines from the discharge were analyzed and the electron temperature was estimated by line intensity ratio method. The electron density in the discharge was estimated by power balance method. An investigation of the effect of inter-electrode distance on the electron density was made. The results showed that the electron temperature is less than 1 eV and the electron density is of the order of 1011cm-3 which varied with the inter electrode distance. Discharge was applied for surface modification of polyethylene terepthalate (PET). Modified surfaces were studied by contact angle measurement and FTIR spectroscopy.
Radiation and Mass Transfer Effects on MHD Natural Convection Flow over an In...IJMER
A numerical solution for the unsteady, natural convective flow of heat and mass transfer along an inclined plate is presented. The dimensionless unsteady, coupled, and non-linear partial differential conservation equations for the boundary layer regime are solved by an efficient, accurate and unconditionally stable finite difference scheme of the Crank-Nicolson type. The velocity, temperature, and concentration fields have been studied for the effect of Magnetic parameter, buoyancy ratio parameter, Prandtl number, radiation parameter and Schmidt number. The local skin-friction, Nusselt number and Sherwood number are also presented and analyzed graphically.
Embracing GenAI - A Strategic ImperativePeter Windle
Artificial Intelligence (AI) technologies such as Generative AI, Image Generators and Large Language Models have had a dramatic impact on teaching, learning and assessment over the past 18 months. The most immediate threat AI posed was to Academic Integrity with Higher Education Institutes (HEIs) focusing their efforts on combating the use of GenAI in assessment. Guidelines were developed for staff and students, policies put in place too. Innovative educators have forged paths in the use of Generative AI for teaching, learning and assessments leading to pockets of transformation springing up across HEIs, often with little or no top-down guidance, support or direction.
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The French Revolution, which began in 1789, was a period of radical social and political upheaval in France. It marked the decline of absolute monarchies, the rise of secular and democratic republics, and the eventual rise of Napoleon Bonaparte. This revolutionary period is crucial in understanding the transition from feudalism to modernity in Europe.
For more information, visit-www.vavaclasses.com
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The understanding of two-phase flow and heat transfer
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has been developed to predict filmwise condensation heat
transfer inside a rectangular minichannel. The Volume of Fluid
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modified High Resolution Interface Capture (HRIC) scheme is
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condensation are solved. The surface tension is taken into
account in the modeling and it is evaluated by the Continuum
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Numerical Simulation and Prediction for Steep Water Gravity Waves of Arbitrar...CSCJournals
Nonlinear permanent progressive wave is one of the most important applications in water waves. In this study, analytic formulation of the steep water gravity waves is presented. Abohadima and Isobe [1] showed that Cokelet solution [2] is the most accurate among many other solutions. Due to the nonlinearity of analytic equations, the need to numeric simulation is raised up. In the current paper, consequence numerical models, using one of the artificial intelligence techniques, are designed to simulate and then predict the non linear properties of permanent steep water waves. Artificial Neural Network (ANN), one of the artificial intelligence techniques, is introduced in the current paper to simulate and predict the wave celerity, momentum, energy and other wave integral properties for any permanent waves in water of arbitrary uniform depth. The ANN results presented in the current study showed that ANN technique, with less effort, is very efficiently capable of simulating and predicting the non linear properties of permanent steep water waves.
Interaction of Components in Molecular Optoelectronics for the Next Generati...Scientific Review SR
The interaction of molecular optoelectronic components on the molecular scale were studied where
the solvent shell indicating the influence of the medium was found to be surprisingly small. The transport of
energy as resonant energy transfer covers distances of about 5 nm and was shown not to proceed by a simple to
dipole dipole interaction with typical restrictions, but by a more complex mechanism. Furthermore, a novel -type of
far-reaching interactions of electronically excited structures until macroscopic dimensions were fond and may be
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A mathematical model is presented in this paper to study the dispersion of aerosols with and
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coefficient is determined and are numerically computed for different values of reaction rate,
electric and Hartmann numbers. The results are depicted graphically and conclusions are drawn
in the final section.
Moisture content investigation in the soil samples using microwave dielectric...IJECEIAES
The microwaves of typical frequency ranges of 3 GHz to 30 GHz have been in use for remote sensing applications which are progressing rapidly. The microwaves can sense existing moisture in any material that absorbs moisture such as soil or vegetation. In case of soils which may be comprised of variable mix proportionate of solids, liquids or gases and distinct textures subjected to the associated size and the arrangements of soil particles. Hence, the moisture absorption by a specific type of soil used to be different. The inherent physical and electrical properties such as color, texture, grains, dielectric constant, conductivity or permeability, etc. differentiate various soils. In this work, authors present soil moisture measurement by simple estimation of emissivity i.e. the ratio of energy radiated by an object to absorbing the body of same physical temperature. A strategic method of measuring dielectric constant using a microwave signal is used in this research work. The measurement of the dielectric constant of the soils collected from the specific regions and analysis of results has been reported. The proposed method is less complex and can further be used for the identification of soil moisture and agricultural applications.
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Electro-acoustic coupling in porous oil-water two-phase systems: Role of liquid micromenisci
1. T. S. Nguyen, L. Lefferts, K. Seshan
Catalytic Processes and Materials, Faculty of Science & Technology
A. Imran, G. Brem, E. A. Bramer
Laboratory of Thermal Engineering, Faculty of Engineering Technology
GOAL
DESIGN&DEVELOPMENT
RESULTSANDDISCUSSIONS
Correspondence: T.S.Nguyen@utwente.nl Green & Smart Process Technologies
Intro
UNIVERSITY OF TWENTE.
Electro-acoustic coupling in porous oil-water two-phase systems: Role of
liquid micromenisci
Tarun Kumar, Helmut Rathgen, Frieder Mugele
FOM-Shell IPP
Electro-seismic(ES) effect has become a hot topic in the exploration of oil and gas reservoirs in recent years. The effect can be defined as the generation
of electrical potential in the subsurface by the passage of seismic waves. However, various aspects of the experiments are not well described by the
current theory. One shortcoming of this theory is that it ignores the presence of liquid menisci at interfaces and within partially saturated porous media. The
goal of this project is to analyze the role of liquid micro menisci in both the electro-seismic as well as in the inverse electro-seismic effect.
In depth Understanding of:
Mechanism of ES coupling in two-phase situations involving oil-water (or water-gas) micromenisci
Roles of meniscus shape and (de)pinning of contact lines for the observed non-linear ES coupling
Enhancing factors of ES coupling and weather exciting the micromenisci in a appropriate manner can make it more efficient
`
`
Sound
well controlled porous
geometry
Laser
Laser
To
Photo
detector
Function
generator/Am
plifier
Amplifier/CRO
V
Fiber Interferometer
Hydrophone
Acoustic-Electro Coupling
Acoustically driven menisci results in
oscillating dipoles at the interface
e.g. Oscillating Electric Field. The
resulting field ionize the Ag electrode,
causing a net voltage generation
Electro-Acoustic Coupling
Menisci can be drive by the applied
AC Field due to the presence of
loosely binds charges at the
interface(Debye layer). The oscillating
menisci emits pressure wave which
can be detected using a Hydrophone
Low Pressure Sensing
Surface of the menisci along with
porous media acts as a periodic
microstructure giving a diffraction
pattern. The curvature of the menisci is
calculated by fitting the experimental
data with a numerical model.
Dynamics of micromenisci under the effect of
external pressure
Figure 5: Schematic of experiment
Laplace eq. at liquid interface (see Fig 2)
Pext=PLap =σκ (1)
σ= surface tension of water
k= curvature of liquid menisci
To calculate k
Using a superhydrophobic 1D reflection grating (with known
parameters) as porous media immersed in water
For a fix value of pressure Intensities are recorded for wide
range of Incidence angle for zero, -1 and +1 diffraction order
Experimental data is fitted with a numerical model to
calculate curvature of liquid menisci k
Figure 2
Figure 3
Figure 4
Detector
y
laser
sam
ple
Figure 7. verifying the Laplace equation: first
curvature were obtained for each applied
pressures and the Laplace pressure was
calculated using eq. 1 and compared with applied
pressure
Figure 6. Experimental data for a fixed
external pressure fitted with a
numerical model to calculate the
corresponding curvature of liquid
menisci
References:-
[1] Rathgen ; H. : ‘’ Super Hydrophobic surface: from Fluids mechanics to Optics ‘’ Dissertation, year
2008, University of Twente, The Netherlands
[2] M. G. Moharam, Drew A. Pommet, Eric B. Grann and T. K. Gaylord. Stable implementation of the
rigorous coupled-wave analysis for surface-relief gratings enhanced transmittance matrix approach. J.
Opt. Soc. Am. A 121077 (1995)*
Correspondence:
tarun18kumar@gmail.com
Figure 1:Schematic of experimental
set up
![T. S. Nguyen, L. Lefferts, K. Seshan
Catalytic Processes and Materials, Faculty of Science & Technology
A. Imran, G. Brem, E. A. Bramer
Laboratory of Thermal Engineering, Faculty of Engineering Technology
GOAL
DESIGN&DEVELOPMENT
RESULTSANDDISCUSSIONS
Correspondence: T.S.Nguyen@utwente.nl Green & Smart Process Technologies
Intro
UNIVERSITY OF TWENTE.
Electro-acoustic coupling in porous oil-water two-phase systems: Role of
liquid micromenisci
Tarun Kumar, Helmut Rathgen, Frieder Mugele
FOM-Shell IPP
Electro-seismic(ES) effect has become a hot topic in the exploration of oil and gas reservoirs in recent years. The effect can be defined as the generation
of electrical potential in the subsurface by the passage of seismic waves. However, various aspects of the experiments are not well described by the
current theory. One shortcoming of this theory is that it ignores the presence of liquid menisci at interfaces and within partially saturated porous media. The
goal of this project is to analyze the role of liquid micro menisci in both the electro-seismic as well as in the inverse electro-seismic effect.
In depth Understanding of:
Mechanism of ES coupling in two-phase situations involving oil-water (or water-gas) micromenisci
Roles of meniscus shape and (de)pinning of contact lines for the observed non-linear ES coupling
Enhancing factors of ES coupling and weather exciting the micromenisci in a appropriate manner can make it more efficient
`
`
Sound
well controlled porous
geometry
Laser
Laser
To
Photo
detector
Function
generator/Am
plifier
Amplifier/CRO
V
Fiber Interferometer
Hydrophone
Acoustic-Electro Coupling
Acoustically driven menisci results in
oscillating dipoles at the interface
e.g. Oscillating Electric Field. The
resulting field ionize the Ag electrode,
causing a net voltage generation
Electro-Acoustic Coupling
Menisci can be drive by the applied
AC Field due to the presence of
loosely binds charges at the
interface(Debye layer). The oscillating
menisci emits pressure wave which
can be detected using a Hydrophone
Low Pressure Sensing
Surface of the menisci along with
porous media acts as a periodic
microstructure giving a diffraction
pattern. The curvature of the menisci is
calculated by fitting the experimental
data with a numerical model.
Dynamics of micromenisci under the effect of
external pressure
Figure 5: Schematic of experiment
Laplace eq. at liquid interface (see Fig 2)
Pext=PLap =σκ (1)
σ= surface tension of water
k= curvature of liquid menisci
To calculate k
Using a superhydrophobic 1D reflection grating (with known
parameters) as porous media immersed in water
For a fix value of pressure Intensities are recorded for wide
range of Incidence angle for zero, -1 and +1 diffraction order
Experimental data is fitted with a numerical model to
calculate curvature of liquid menisci k
Figure 2
Figure 3
Figure 4
Detector
y
laser
sam
ple
Figure 7. verifying the Laplace equation: first
curvature were obtained for each applied
pressures and the Laplace pressure was
calculated using eq. 1 and compared with applied
pressure
Figure 6. Experimental data for a fixed
external pressure fitted with a
numerical model to calculate the
corresponding curvature of liquid
menisci
References:-
[1] Rathgen ; H. : ‘’ Super Hydrophobic surface: from Fluids mechanics to Optics ‘’ Dissertation, year
2008, University of Twente, The Netherlands
[2] M. G. Moharam, Drew A. Pommet, Eric B. Grann and T. K. Gaylord. Stable implementation of the
rigorous coupled-wave analysis for surface-relief gratings enhanced transmittance matrix approach. J.
Opt. Soc. Am. A 121077 (1995)*
Correspondence:
tarun18kumar@gmail.com
Figure 1:Schematic of experimental
set up](https://image.slidesharecdn.com/posterveldhoven-130707034505-phpapp01/85/Electro-acoustic-coupling-in-porous-oil-water-two-phase-systems-Role-of-liquid-micromenisci-1-320.jpg)
