Journal articleSensors and Actuators B Chemical · November 15, 2002
A model is formulated to describe the dynamics of electro-wetting-induced transport of liquid droplets. The velocity of droplet transport as a function of actuation voltage is derived. The operating parameters include the viscosity of the droplet and the m ...
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Journal articleJournal of biomechanics · April 1995
The numerical simulation of fluid flow and transport near biological surfaces must take into account the natural irregularity of these surfaces if the influence of the surface geometry on the near-wall flow field is to be modeled. If the geometric descript ...
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Journal articleNumerical Heat Transfer Part A Applications · January 1, 1995
This investigation explores the natural convection in a water-filled straight inclined fracture in rock subject to a uniform background temperature increasing with depth. The numerical solutions cover aspect ratios from 2 to SO, with Rayleigh numbers of ma ...
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Journal articleNumerical Heat Transfer Part B Fundamentals · January 1, 1992
This article describes an integral method for obtaining the average cross-section pressure distribution in tube flows by using the vorticity-streamfunction formulation. The method derives from the fact that the average cross-section pressure is related in ...
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Journal articleEur Heart J · April 1990
Regurgitant jets were simulated in vitro and analysed using Doppler colour flow imaging. The regurgitant volumes were estimated using total jet area (JA), variance area (VA), and the maximum area of variance x time to maximum area of variance (MAVT). Both ...
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Journal articleComputers and Fluids · January 1, 1990
The α method is a simple finite difference method for analyzing one-dimensional compressible flow problems in the Lagrangian particle description which is easy to code for a variety of applications in science and engineering. The method employs a weighted ...
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Journal articleComputers and Fluids · January 1, 1990
The equations for one-dimensional compressible flow with area change are derived in the Lagrangian particle description for the first time. A simple finite difference code based on the α method is used to obtain the solution for three problems; the passage ...
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Journal articleConference Record IAS Annual Meeting IEEE Industry Applications Society · December 1, 1989
A first-order model of electrically driven flows is described and applied to flows driven by Joule heating of a dielectric fluid. An exact solution for the reduced, first-order equations of electrohydrodynamics is developed for the case of a steady, fully ...
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Journal articleBiotechnology and bioengineering · January 1989
Dilute aqueous solutions of polymers released by marine phytoplankton (microalgae) were shown to effectively reduce drag in capillary pipe flow. Tests were performed in a capillary turbulent flow viscometer which extruded small samples under high pressures ...
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Journal articleJournal of Physics E Scientific Instruments · December 1, 1988
The design of an electronically switched flowmeter and temperature sensor employing a single thermistor probe is described. Digital temperature compensation is incorporated in the design. The concept is applicable to geophysical flows; in this case, design ...
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Journal articleJournal of Physics E Scientific Instruments · December 1, 1987
The temperature compensation of a thermistor flowmeter is accomplished digitally, thus simplifying the compensation problem by replacing required hardware with software. The resistance-temperature curve of the thermistor is a least-squares fit to a logarit ...
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Journal articleundefined · December 1, 1987
An impeller-free mechanism for suspension and agitation of mammalian cells or cell-covered microcarrier beads is described. The approach involves the controlled, large-amplitude deformation of a compliant portion of the bioreactor boundary. The deformable ...
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Journal articleJournal of Heat Transfer · January 1, 1986
The enhancement of convective heat transfer by an electric field is but one aspect of the complex thermoelectric phenomena which arise from the interaction of fluid dynamic and electric fields. Our current knowledge of this area is limited to a very few ex ...
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Journal articleIEEE Transactions on Industry Applications · January 1, 1986
Probe techniques are discussed which have proven useful in the measurement of the current induced pressure distribution in the active electrical zone of a wire-cylinder electrostatic precipitator. The cylindrical electrode configuration is somewhat unique ...
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Journal articleExperiments in Fluids · January 1, 1986
The effect of an electric body force on vorticity production and turbulence generation in a gas is investigated by examination of the governing electrohydrodynamic equations. The theoretical concepts are illustrated by hot-film anemometer measurements of t ...
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Journal articleAerosol Science and Technology · January 1, 1985
The role of the electric body force in the generation of secondary flows and turbulence in precipitators is poorly understood at present, despite the fact that these disturbances are thought to be detrimental to precipitator performance. This paper underta ...
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Journal articleAmerican Society of Mechanical Engineers Heat Transfer Division Publication HTD · December 1, 1984
The enhancement of convective heat transfer by an electric field is but one aspect of the complex thermoelectric phenomena which arise from the interaction of fluid dynamic and electric fields. Convective flows in enclosures are particularly sensitive beca ...
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Journal articleAmerican Society of Mechanical Engineers Paper · December 1, 1984
Despite the longstanding use of electrostatic precipitators, questions remain concerning the aerodynamic effects of corona discharge. While the electric body force on the gas produces a corona wind, corona induced secondary flow and turbulence are not unde ...
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Journal articleundefined · December 1, 1984
A submersible laser-Doppler anemometer which employs a differential detection scheme to cancel laser noise, and a fused optical fiber to transmit scattered light, is used to measure the turbulent energy spectrum in the Pivers Island channel at Beaufort, N. ...
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Journal articleundefined · December 1, 1984
The effect of an electric body force on vorticity production and turbulence generation in a gas is investigated by examination of the governing electrohydrodynamic equations. The theoretical concepts are illustrated by hot-film anemometer measurements of t ...
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Journal articleNuclear Instruments & Methods in Physics Research, Section B: Beam Interactions with Materials and · 1984
A deconvolution procedure which corrects Doppler-broadened positron annihilation spectra for instrument resolution is described. The method employs fast Fourier transforms, is model independent, and does not require iteration. The mathematical difficulties ...
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Journal articleNuclear Inst and Methods in Physics Research B · January 1, 1984
A deconvolution procedure which corrects Doppler-broadened positron annihilation spectra for instrument resolution is described. The method employs fast Fourier transforms, is model independent, and does not require iteration. The mathematical difficulties ...
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Journal articleAgricultural and Forest Meteorology · January 1, 1984
Mean windspeed profiles and microscale pressure fluctuations at the surface were measured before and after leaf emergence in a deciduous forest. Effects of the leaf emergence were evident in the windspeed profiles, as well as effects of flow-through from a ...
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Journal articleBoundary Layer Meteorology · December 1, 1983
Static pressure fluctuations in the microscale range were measured in a mature deciduous forest. Pressure measurements were taken at the ground and above the canopy, and mean profile data of windspeed were collected from above the canopy to near the forest ...
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Journal articleundefined · January 1, 1982
The results of a series of measurements of longitudinal velocity and temperature fluctuations made in a estuarine tidal channel flow are reported. A submersible laser Doppler velocimeter (LDV) operating in the dual beam forward scatter mode is used for vel ...
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Journal articleundefined · January 1, 1982
The results of a series of measurements of longitudinal velocity and temperature fluctuations made in a estuarine tidal channel flow are reported. A submersible laser Doppler velocimeter (LDV) operating in the dual beam forward scatter mode is used for vel ...
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Journal article · January 1, 1982
The results of a series of measurements of longitudinal velocity and temperature fluctuations made in a estuarine tidal channel flow are reported. A submersible laser Doppler velocimeter (LDV) operating in the dual beam forward scatter mode is used for vel ...
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Journal article · January 1, 1982
The results of a series of measurements of longitudinal velocity and temperature fluctuations made in a estuarine tidal channel flow are reported. A submersible laser Doppler velocimeter (LDV) operating in the dual beam forward scatter mode is used for vel ...
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Journal articleASME Pap · January 1, 1979
Solutions to the steady state heat equation are obtained using the Chebyshev-Tau matrix method. This technique employs a Chebyshev series representation for the temperature field with unknown coefficients which are selected so that the dynamical equation a ...
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Journal articleJournal of Heat Transfer · January 1, 1979
A fourth order regular perturbation expansion in powers of the Reynolds number is used to investigate the steady convection of a stratified Boussinesq fluid in rotating spherical annuli. The results include the primary and secondary flow patterns, temperat ...
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Journal articleASME Pap · January 1, 1979
Solutions to the unsteady heat conduction problem are obtained using a numerical procedure based on a Chebyshev series representation for the spatial dependence of the temperature field. This series contains time dependent coefficients which are selected s ...
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Journal articleApplied Physics Letters · December 1, 1978
A laser-Doppler anemometer based on a continuous GaAlAs diode laser source is described. It is shown that the coherence length of the diode output requires that the optical design incorporate equal path lengths for good fringe visibility. The results show ...
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Journal articleJournal of Heat Transfer · January 1, 1978
The use of spectral expansions for solving nonlinear partial differential equations is explained, and two examples drawn from convective heat transfer are presented. For both problems the results agree well with regular perturbation solutions at parameter ...
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Journal articleInternational Journal of Heat and Mass Transfer · January 1, 1978
The effects of stable stratification on the steady laminar flow of a viscous fluid in a rotating spherical annulus are investigated. Three rotational configurations are discussed: inner sphere rotating, outer sphere at rest; inner sphere at rest, outer sph ...
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Journal articleInternational Journal of Heat and Mass Transfer · January 1, 1978
The steady combined thermal convection of a viscous Boussinesq fluid contained between two concentric spheres is considered. The spheres are maintained at different temperatures and rotate about a common axis with different angular velocities. A uniform ra ...
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Journal articleInternational Journal of Heat and Mass Transfer · January 1, 1978
The steady forced convection of a viscous fluid contained between two concentric spheres which are maintained at different temperatures and rotate about a common axis with different angular velocities is considered. Approximate solutions to the governing e ...
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Journal articleApplied Physics Letters · December 1, 1977
A laser light-scattering technique for measuring the relative particle concentration in a turbulent mixing field is described. The effects of ambiguity noise and optical path attenuation noise on the measurement of concentration fluctuations with this tech ...
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Journal articleJournal of Fluid Mechanics · 1977
A laser light-scattering technique has been used to study the relative particle concentration field in a round turbulent air jet. Measurements were made in the far field of a smoke-marked turbulent jet exhausting into a secondary air stream. Radial distrib ...
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Journal articleJournal of Heat Transfer · January 1, 1977
Steady natural convection in very low Prandtl number fluids is investigated using a double perturbation expansion in powers of the Grashof and Prandtl numbers. The fluid is contained in a horizontal cylindrical annulus, the walls of which either are held a ...
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Journal articleJournal of Fluid Mechanics · January 1, 1977
A laser light-scattering technique has been used to study the relative particle concentration field in a round turbulent air jet. Measurements were made in the far field of a smoke-marked turbulent jet exhausting into a secondary air stream. Radial distrib ...
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Journal articleJournal of Fluid Mechanics · November 28, 1972
The axial and transverse wave motions of an inviscid perfect gas in isothermal solid-body rotation in a cylinder are investigated. Solutions of the resulting eigenvalue problem are shown to correspond to two types of waves. The acoustic waves are the rotat ...
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Journal articleJournal of Fluid Mechanics · 1972
The axial and transverse wave motions of an inviscid perfect gas in isothermal solid-body rotation in a cylinder are investigated. Solutions of the resulting eigenvalue problem are shown to correspond to two types of waves. The acoustic waves are the rotat ...
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