Dr Julia Rees
School of Mathematics and Statistics
Reader
J.Rees@shef.ac.uk
+44 114 222 3782
+44 114 222 3782
H21, Hicks Building
Full contact details
Dr Julia Rees
School of Mathematics and Statistics
H21
Hicks Building
Hounsfield Road
Sheffield
S3 7RH
School of Mathematics and Statistics
H21
Hicks Building
Hounsfield Road
Sheffield
S3 7RH
- Research interests
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I undertake research into a wide range of problems that involve fluid mechanics. I have successfully supervised many PhD students - please get in touch if you are interested in doing a Phd!
Engineering Fluid Dynamics
My research interests are motivated by the desire to better understand the behaviour of fluids in order to make advances in practical engineering systems. My work involves collaborations with engineering industrial partners, as well as with colleagues from the Faculty of Engineering here at Sheffield. I am particularly interested in micro-bubble mediated flows - this refers to flows where the injection of a stream of small micro-bubbles significantly improves transfer rates. This has applications to a wide range of applications, including distillation and water purification.
Rheology
Rheology is the field of scientific research that investigates "how a fluid flows". I am particularly interested in fluids that don't follow the standard rules of Newtonian fluids. Such fluids are called complex or non-Newtonian fluids. My work in this area has involved experiments, asymptotic analysis and CFD modelling.
Microfluidics for Biotechnology
My research focuses on the solution of inverse problems that arise in the sensing and control of lab-on-a-chip chemical analysis and chemical microreactor applications, and path-lab-on-a-chip biomedical analysis. The work involves modelling flow in microchannels and is carried out in collaboration with the Microfluidics Group from the Department of Chemical and Process Engineering at the University of Sheffield.
Meteorology
My work involves modelling of the stably stratified atmospheric boundary layer and the analysis of meteorological observations. The Earth's boundary layer supports varied and complex waveforms, from internal gravity waves to turbulent eddies. I am particularly interested in large amplitude, solitary waves. In recent years this work has involved collaborations with the British Antarctic Survey, Meteorological Office and the Complutense University of Madrid.
- Publications
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Show: Featured publications All publications
Featured publications
Journal articles
- Viscoelastic Hele-Shaw flow in a cross-slot geometry. European Journal of Mechanics - B/Fluids, 68, 45-54. View this article in WRRO
- Carreau fluid in a wall driven corner flow. Journal of Non-Newtonian Fluid Mechanics, 253, 16-26. View this article in WRRO
- Excitation of Surface Waves Due to Thermocapillary Effects on a Stably Stratified Fluid Layer. Applied Sciences, 7(4). View this article in WRRO
- Purification of Bioethanol Using Microbubbles Generated by Fluidic Oscillation: A Dynamical Evaporation Model. Industrial & Engineering Chemistry Research, 55(50), 12909-12918. View this article in WRRO
- Separation of azeotropic mixtures using air microbubbles generated by fluidic oscillation. AIChE Journal, 62(4), 1192-1199.
- An intermediate wavelength, weakly nonlinear theory for the evolution of capillary gravity waves. Wave Motion, 48, 707-716.
- Pressure sensor positioning in an electrokinetic microrheometer device: simulations of shear-thinning liquid flows. MICROFLUID NANOFLUID, 9(2-3), 559-571.
- Creeping flow analysis of an integrated microfluidic device for rheometry. Journal of Non-Newtonian Fluid Mechanics, 165(19-20), 1302-1308.
- Optimal modelling and experimentation for the improved sustainability of microfluidic chemical technology design. CHEM ENG RES DES, 87(6A), 798-808. View this article in WRRO
- On slip velocity boundary conditions for electroosmotic flow near sharp corners. PHYS FLUIDS, 20(4). View this article in WRRO
- Rollover instability due to double diffusion in a stably stratified cylindrical tank. PHYS FLUIDS, 19(12). View this article in WRRO
- Rheometry of non-Newtonian electrokinetic flow in a microchannel T-junction. MICROFLUID NANOFLUID, 2(6), 481-492.
- Long solitary internal waves in stable stratifications. NONLINEAR PROC GEOPH, 11(2), 165-180.
All publications
Journal articles
- Semi-dilute dumbbells: solutions of the Fokker–Planck equation. J - An Open Access Journal of Multidisciplinary Science (J), 4(3), 341-355.
- Constitutive Parameters of the Extensional Flow Defined by an Inverse Method. Advanced Science Letters, 24(12), 9616-9619.
- Viscoelastic Hele-Shaw flow in a cross-slot geometry. European Journal of Mechanics - B/Fluids, 68, 45-54. View this article in WRRO
- Carreau fluid in a wall driven corner flow. Journal of Non-Newtonian Fluid Mechanics, 253, 16-26. View this article in WRRO
- Excitation of Surface Waves Due to Thermocapillary Effects on a Stably Stratified Fluid Layer. Applied Sciences, 7(4). View this article in WRRO
- Purification of Bioethanol Using Microbubbles Generated by Fluidic Oscillation: A Dynamical Evaporation Model. Industrial & Engineering Chemistry Research, 55(50), 12909-12918. View this article in WRRO
- Dual-plane PIV investigation of acoustically excited jets in a swirl nozzle. Nonlinear Processes in Geophysics, 23, 83-89. View this article in WRRO
- Separation of azeotropic mixtures using air microbubbles generated by fluidic oscillation. AIChE Journal, 62(4), 1192-1199.
- Hydrophilic Surface Modification of PDMS Microchannel for O/W and W/O/W Emulsions. Micromachines, 6(10), 1445-1458.
- Dynamic Wetting in Microfluidic Droplet Formation. BIOCHIP JOURNAL, 8(2), 122-128.
- Investigation of pressure profile evolution during confined microdroplet formation using a two-phase level set method. International Journal of Multiphase Flow, 60, 40-49.
- Towards online, continuous monitoring for rheometry of complex fluids.. Adv Colloid Interface Sci, 206, 294-302.
- Surface coating of bonded PDMS microchannels by atmospheric pressure microplasma. Plasma Processes and Polymers, 11(3), 279-288.
- Microplasma copolymerization of amine and Si containing precursors. Thin Solid Films.
- Characterization of atmospheric pressure microplasma produced from argon and a mixture of argon-ethylenediamine. Physics Letters, Section A: General, Atomic and Solid State Physics.
- Plasma polymerization in a microcapillary using an atmospheric pressure dielectric barrier discharge. Surface and Coatings Technology.
- Simulations of microfluidic droplet formation using the two-phase level set method. CHEM ENG SCI, 66(20), 4733-4741.
- An inverse method for rheometry of power-law fluids. Measurement Science and Technology, 20.
- Analysis of capillary-gravity waves using the discrete periodic inverse scattering transform. Colloids and Surfaces A: Physicochemical and Engineering Aspects.
- An intermediate wavelength, weakly nonlinear theory for the evolution of capillary gravity waves. Wave Motion, 48, 707-716.
- Pressure sensor positioning in an electrokinetic microrheometer device: simulations of shear-thinning liquid flows. MICROFLUID NANOFLUID, 9(2-3), 559-571.
- Rheometry of non-Newtonian polymer solution using microchannel pressure driven flow. Applied Rheology, 20(5), 1-13.
- Creeping flow analysis of an integrated microfluidic device for rheometry. Journal of Non-Newtonian Fluid Mechanics, 165(19-20), 1302-1308.
- Optimal modelling and experimentation for the improved sustainability of microfluidic chemical technology design. CHEM ENG RES DES, 87(6A), 798-808. View this article in WRRO
- Impact of height-dependent drainage forcing on the stable atmospheric boundary layer over a uniform slope. NUOVO CIMENTO C, 31(5-6), 699-710. View this article in WRRO
- Adaptation of wavelet transform analysis to the investigation of biological variations in speech signals.. Med Eng Phys, 30(7), 865-871. View this article in WRRO
- On slip velocity boundary conditions for electroosmotic flow near sharp corners. PHYS FLUIDS, 20(4). View this article in WRRO
- Rollover instability due to double diffusion in a stably stratified cylindrical tank. PHYS FLUIDS, 19(12). View this article in WRRO
- Numerical analysis of solutocapillary Marangoni-induced interfacial waves.. Adv Colloid Interface Sci, 134-135, 346-359.
- Rheometry of non-Newtonian electrokinetic flow in a microchannel T-junction. MICROFLUID NANOFLUID, 2(6), 481-492.
- Stable atmospheric boundary layer over a uniform slope: Some theoretical concepts. BOUND-LAY METEOROL, 120(2), 219-227.
- On the use of audio-tapes for teaching vector analysis to engineering undergraduates. International Journal of Mechanical Engineering Education, 33(4), 358-368.
- Inverse problems in non-newtonian electrokinetic flows in microchannel networks. Proceedings of the 7th Biennial Conference on Engineering Systems Design and Analysis, ESDA 2004, 3, 553-560.
- Long solitary internal waves in stable stratifications. NONLINEAR PROC GEOPH, 11(2), 165-180.
- Comparison of the He+ layer observed over Arecibo during solar maximum and solar minimum with CTIP model results. J GEOPHYS RES-SPACE, 108(A12).
- On solitary wave mediated heat exchange in the Antarctic boundary layer. Atmospheric Science Letters, 4(1-4), 1-14.
- Special issue - Mixing in geophysical and astrophysical flows. DYNAM ATMOS OCEANS, 34(2-4), 79-79.
- Case study of a wave event in the stable atmospheric boundary layer overlying an Antarctic Ice Shelf using the orthogonal wavelet transform. DYNAMICS OF ATMOSPHERES AND OCEANS, 34(2-4), 245-261.
- Mixing Processes in Geophysical and Astrophysical Flows: A Conference Report. Environmental Fluid Mechanics, 1(3), 333-343.
- Stable atmospheric boundary-layer experiment in Spain (SABLES 98): A report. BOUND-LAY METEOROL, 96(3), 337-370.
- A climatological study of internal gravity waves in the atmospheric boundary layer overlying the brunt ice shelf, Antarctica. J ATMOS SCI, 57(4), 511-526.
- Detecting waves using an array of sensors. MON WEATHER REV, 127(1), 57-69.
- A practical example of low-frequency trend removal. Boundary-Layer Meteorology, 86(1), 181-187.
- Observations of solitary waves in the stable atmospheric boundary layer. BOUND-LAY METEOROL, 86(1), 47-61.
- Analysis of wind fluctuations using the orthogonal wavelet transform. APPL SCI RES, 59(2-3), 205-218.
- ANALYSIS OF SOLITARY DISTURBANCES OVER AN ANTARCTIC ICE SHELF. BOUND-LAY METEOROL, 69(3), 285-310.
- A MICROBAROGRAPH FOR INTERNAL GRAVITY-WAVE STUDIES IN ANTARCTICA. ANTARCTIC SCIENCE, 4(2), 241-248.
- A microbarograph for internal gravity wave studies in Antarctica. Antarctic Science, 4(2), 241-248.
- ON THE CHARACTERISTICS OF EDDIES IN THE STABLE ATMOSPHERIC BOUNDARY-LAYER. BOUND-LAY METEOROL, 55(4), 325-343.
- STUDIES OF ATMOSPHERIC INTERNAL GRAVITY-WAVES AT HALLEY STATION, ANTARCTICA, USING RADIOSONDES. ANTARCT SCI, 1(1), 65-75.
- THE STABLE ANTARCTIC BOUNDARY LAYER EXPERIMENT AT HALLEY STATION. Weather, 44(10), 398-405.
- STUDIES OF INTERNAL GRAVITY-WAVES AT HALLEY BASE, ANTARCTICA, USING WIND OBSERVATIONS. Q J ROY METEOR SOC, 114(482), 939-966.
- THE PROPAGATION OF INTERNAL GRAVITY-WAVES IN THE STABLY STRATIFIED ATMOSPHERIC BOUNDARY-LAYER. ANN GEOPHYS B-TERR P, 5(5), 421-432.
- OBSERVATIONS OF AN INTERNAL GRAVITY-WAVE IN THE LOWER TROPOSPHERE AT HALLEY, ANTARCTICA. BOUND-LAY METEOROL, 39(1-2), 1-13.
- Microwave measurement of furnace wall thickness. Transactions of the Institute of Measurement and Control, 8(2), 91-99.
- Measuring Vapor and Liquid Concentrations for Binary and Ternary Systems in a Microbubble Distillation Unit via Gas Sensors. Chemosensors, 6(3), 31-31.
- Dual plane PIV investigation of acoustically excited jets in a swirl nozzle. Nonlinear Processes in Geophysics Discussions, 2(5), 1407-1424. View this article in WRRO
- Re-Entrant Corner for a White-Metzner Fluid. Fluids, 6(7), 241-241.
Chapters
- Spectral Properties of Turbulence and the Structure of the Atmospheric Boundary Layer, Advances in Turbulence 3 (pp. 351-358). Springer Berlin Heidelberg
- Cross-Spectral Properties of Large Eddies in the Stably Stratified Atmospheric Boundary Layer, Advances in Turbulence 2 (pp. 180-185). Springer Berlin Heidelberg
Conference proceedings papers
- Stagnation Flow Extensional Viscosity Measurement Using Inverse Methods. USES
- Microfluidic rheometry of a polymer solution by micron resolution particle image velocimetry: a model validation study. MEASUREMENT SCIENCE & TECHNOLOGY, Vol. 20(11) View this article in WRRO
- An inverse methodology for the rheology of a power-law non-Newtonian fluid. PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART C-JOURNAL OF MECHANICAL ENGINEERING SCIENCE, Vol. 222(5) (pp 761-768) View this article in WRRO
- A modified CTIP model and comparisons with DMSP satellite data. PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY OF LONDON SERIES A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES, Vol. 361(1802) (pp 139-142)
- Analysis of magnetometer data using wavelet transforms. PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY OF LONDON SERIES A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES, Vol. 361(1802) (pp 133-137)
- Modelling helium ions in the earth's upper atmosphere. DYNAMICS OF ATMOSPHERES AND OCEANS, Vol. 34(2-4) (pp 383-397)
- Characteristics of turbulence in the lower atmosphere at Halley IV station, Antarctica. DYNAMICS OF ATMOSPHERES AND OCEANS, Vol. 34(2-4) (pp 205-223)
- Wavelet analysis of magnetometer data - Preliminary results. SHEFFIELD SPACE PLASMA MEETING: MULTIPOINT MEASUREMENT VERSUS THEORY, PROCEEDINGS, Vol. 492 (pp 151-156)
- Viscoelastic Hele-Shaw flow in a cross-slot geometry. European Journal of Mechanics - B/Fluids, 68, 45-54. View this article in WRRO
- Research group
- Grants
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Past grants, as Principal Investigator
Internal gravity waves in the stable atmospheric boundary layer NERC Past grants, as Coinvestigator
Enhanced Biofuel Production via Integretad Microbubble Technology EPSRC Microbubble Cloud Generation EPSRC European study group with industry ESGI2000 EPSRC
- Teaching interests
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I have taught a wide-range of Maths modules, both for specialist Mathematics Undergraduates and for Engineering Undergraduates. I have an MEd in Teaching and Learning for University Lecturers, awarded by the University of Sheffield.