Scholars@Duke
Edward J. Shaughnessy

Edward J. Shaughnessy

Professor Emeritus in the Thomas Lord Department of Mechanical Engineering and Materials Science
Thomas Lord Department of Mechanical Engineering and Materials Science
eshaughn@duke.edu
Box 90300, Durham, NC 27708-0300
056 Engineering Bldg, Durham, NC 27708
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Selected Publications

Dynamics of electro-wetting droplet transport

Journal Article Sensors 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 ... Full text Cite

A technical problem in the calculation of laminar flow near irregular surfaces described by sampled geometric data.

Journal Article Journal 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 ... Full text Cite

Low rayleigh number conjugate convection in straight inclined fractures in rock

Journal Article Numerical 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 ... Full text Cite

Method for calculating the average cross-section pressure distribution in tube flows within the vorticity-streamfunction formulation

Journal Article Numerical 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 ... Full text Cite

Electrohydrodynamic pressure of the point-to-plane corona discharge

Journal Article Aerosol Science and Technology · January 1, 1991 Full text Cite

In vitro analysis of jets by Doppler colour flow imaging: the importance of time to maximum jet area.

Journal Article Eur 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 ... Full text Link to item Cite

Computer aided analysis of 1-D compressible flow problems in a Lagrangian particle description using the α method

Journal Article Computers 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 ... Full text Cite

The equations of 1-D compressible flow with area change in a Lagrangian particle description

Journal Article Computers 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 ... Full text Cite

Exact solution for electrically-driven convection between vertical electrodes

Journal Article Conference 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 ... Cite

Drag reducing properties of microalgal exopolymers.

Journal Article Biotechnology 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 ... Full text Cite

An electronically switched flowmeter and temperature sensor employing a single thermistor probe

Journal Article Journal 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 ... Full text Cite

Digital temperature compensation of a thermistor flowmeter

Journal Article Journal 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 ... Full text Cite

IMPELLER-FREE AGITATOR FOR SUSPENSION CULTURE OF MAMMALIAN CELLS.

Journal Article · 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 ... Cite

Electric field effects on natural convection in enclosures

Journal Article Journal 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 ... Full text Cite

A Technique for Pressure Measurement in the Active Electrical Zone of a Wire-Cylinder Electrostatic Precipitator

Journal Article IEEE 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 ... Full text Cite

Turbulence generation by electric body forces

Journal Article Experiments 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 ... Full text Cite

The fluid mechanics of electrostatic precipitators

Journal Article Aerosol 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 ... Full text Cite

ELECTRIC FIELD EFFECTS ON NATURAL CONVECTION IN ENCLOSURES.

Journal Article American 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 ... Cite

MEAN VELOCITY AND TURBULENT INTENSITY PROFILES IN A LARGE SCALE LABORATORY PRECIPITATOR.

Journal Article American 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 ... Cite

MEASUREMENTS OF THE ENERGY SPECTRUM IN A TIDAL CHANNEL USING A SECOND GENERATION SUBMERSIBLE LASER-DOPPLER ANEMOMETER.

Journal Article · 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. ... Cite

Dynamics of electro-wetting droplet transport

Journal Article Sensors 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 ... Full text Cite

A technical problem in the calculation of laminar flow near irregular surfaces described by sampled geometric data.

Journal Article Journal 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 ... Full text Cite

Low rayleigh number conjugate convection in straight inclined fractures in rock

Journal Article Numerical 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 ... Full text Cite

Method for calculating the average cross-section pressure distribution in tube flows within the vorticity-streamfunction formulation

Journal Article Numerical 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 ... Full text Cite

Electrohydrodynamic pressure of the point-to-plane corona discharge

Journal Article Aerosol Science and Technology · January 1, 1991 Full text Cite

In vitro analysis of jets by Doppler colour flow imaging: the importance of time to maximum jet area.

Journal Article Eur 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 ... Full text Link to item Cite

Computer aided analysis of 1-D compressible flow problems in a Lagrangian particle description using the α method

Journal Article Computers 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 ... Full text Cite

The equations of 1-D compressible flow with area change in a Lagrangian particle description

Journal Article Computers 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 ... Full text Cite

Exact solution for electrically-driven convection between vertical electrodes

Journal Article Conference 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 ... Cite

Drag reducing properties of microalgal exopolymers.

Journal Article Biotechnology 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 ... Full text Cite

An electronically switched flowmeter and temperature sensor employing a single thermistor probe

Journal Article Journal 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 ... Full text Cite

Digital temperature compensation of a thermistor flowmeter

Journal Article Journal 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 ... Full text Cite

IMPELLER-FREE AGITATOR FOR SUSPENSION CULTURE OF MAMMALIAN CELLS.

Journal Article · 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 ... Cite

Electric field effects on natural convection in enclosures

Journal Article Journal 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 ... Full text Cite

A Technique for Pressure Measurement in the Active Electrical Zone of a Wire-Cylinder Electrostatic Precipitator

Journal Article IEEE 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 ... Full text Cite

Turbulence generation by electric body forces

Journal Article Experiments 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 ... Full text Cite

The fluid mechanics of electrostatic precipitators

Journal Article Aerosol 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 ... Full text Cite

ELECTRIC FIELD EFFECTS ON NATURAL CONVECTION IN ENCLOSURES.

Journal Article American 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 ... Cite

MEAN VELOCITY AND TURBULENT INTENSITY PROFILES IN A LARGE SCALE LABORATORY PRECIPITATOR.

Journal Article American 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 ... Cite

MEASUREMENTS OF THE ENERGY SPECTRUM IN A TIDAL CHANNEL USING A SECOND GENERATION SUBMERSIBLE LASER-DOPPLER ANEMOMETER.

Journal Article · 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. ... Cite

TURBULENCE GENERATION BY ELECTRIC BODY FORCES.

Journal Article · 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 ... Cite

DECONVOLUTION OF DOPPLER-BROADENED POSITRON ANNIHILATION MEASUREMENTS USING FAST FOURIER TRANSFORMS AND POWER SPECTRAL ANALYSIS.

Journal Article Nuclear 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 ... Cite

The deconvolution of Doppler-broadened positron annihilation measurements using fast Fourier transforms and power spectral analysis

Journal Article Nuclear 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 ... Full text Cite

Leaf emergence and flow-through effects on mean windspeed profiles and microscale pressure fluctuations in a deciduous forest

Journal Article Agricultural 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 ... Full text Cite

Microscale pressure fluctuations in a mature deciduous forest

Journal Article Boundary-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 ... Full text Cite

Measurement of turbulence in a tidal channel using a laser Doppler velocimeter.

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 ... Cite

Measurement of turbulence in a tidal channel using a laser Doppler velocimeter.

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 ... Cite

Measurement of turbulence in a tidal channel using a laser Doppler velocimeter.

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 ... Cite

Measurement of turbulence in a tidal channel using a laser Doppler velocimeter.

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 ... Cite

LASER DOPPLER ANEMOMETER MEASUREMENTS OF PARTICLE VELOCITY IN A LABORATORY PRECIPITATOR.

Journal Article Conference Record - IAS Annual Meeting (IEEE Industry Applications Society) · December 1, 1981 Cite

CHEBYSHEV MATRIX METHODS FOR THE HEAT EQUATION: CONVERGENCE AND ACCURACY.

Conference ASME 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 ... Cite

SPECTRAL METHODS FOR TRANSIENT HEAT CONDUCTION PROBLEMS IN SIMPLE GEOMETRIES.

Conference ASME 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 ... Cite

CHEBYSHEV MATRIX METHODS FOR THE HEAT EQUATION: CONVERGENCE AND ACCURACY.

Journal Article ASME 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 ... Cite

Small reynolds number convection in rotating spherical annuli

Journal Article Journal 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 ... Full text Cite

SPECTRAL METHODS FOR TRANSIENT HEAT CONDUCTION PROBLEMS IN SIMPLE GEOMETRIES.

Journal Article ASME 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 ... Cite

GaAlAs diode sources for laser-Doppler anemometry

Journal Article Applied 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 ... Full text Cite

Partial spectral expansions for problems in thermal convection

Journal Article Journal 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 ... Full text Cite

The effect of stable stratification on the motion in a rotating spherical annulus

Journal Article International 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 ... Full text Cite

Thermal convection in rotating spherical annuli-2. Stratified flows

Journal Article International 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 ... Full text Cite

Thermal convection in rotating spherical annuli-1. Forced convection

Journal Article International 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 ... Full text Cite

Laser light-scattering technique for measurements of turbulent mixing

Journal Article Applied 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 ... Full text Cite

LASER LIGHT-SCATTERING MEASUREMENTS OF PARTICLE CONCENTRATION IN A TURBULENT JET.

Journal Article Journal 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 ... Cite

Thermoconvective motion of low prandtl number fluids within a horizontal cylindrical annulus

Journal Article Journal 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 ... Full text Cite

Natural convection in liquid metals in an enclosure

Journal Article Journal of Heat Transfer · January 1, 1977 Full text Cite

Laser light-scattering measurements of particle concentration in a turbulent jet

Journal Article Journal 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 ... Full text Cite

Waves in a gas in solid-body rotation

Journal Article Journal 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 ... Full text Cite

WAVES IN A GAS IN SOLID-BODY ROTATION.

Journal Article Journal 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 ... Cite