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Preliminary Development of Minifluidic OFR Technology
Conventional correlations & pressure field generation
A. Donaldson, Dept. of Process Eng. Dalhousie University
K. Shanmugam, Dept. of Process Eng. Dalhousie University
Micro/Mini/Meso Fluidic Systems
• Micro-fluidics
• Mini-fluidics
• Meso - OFR Systems
• Analytical Applications• Multi-kg / day processing capacity• Capillary/surface forces dominate• Laminar flow conditions & mixing
limitations• Emerging & established
technology base • Limited industrial process
applications due to capacity constraints
Micro/Mini/Meso Fluidic Systems
• Micro-fluidics
• Mini-fluidics
• Meso - OFR Systems
• Increased applicability to industrial processing applications
• Multi-tonne / day capacity• Transitional flow conditions, with
some mixing limitations• Multi-phase applications still in
development phase• Scaling strategies, solids handling,
reliability, pilot-scale demonstration
Single-phase Mini-fluidics
• Mix & React
Mixing Region Low residence time
High energy dissipation
Contactor
Reaction Region High residence time
Low energy dissipation
Multi-phase Mini-fluidics
• Continuous Interfacial Renewal• Between emulsification & plug flow
Micro/Mini/Meso Fluidic Systems
• Micro-fluidics
• Mini-fluidics
• Meso - OFR Systems
• Notable development by Harvey & Mackley at Cambridge University
• Centimeter+ scale geometries• Plug flow characteristics, multi-
phase applications, demonstrated at pilot-scale
• Capability to control shear and energy dissipation independently from processing rate (flexibility in scaling)
Conventional OFR
• Radial mixing through vortex shedding propagation
A.P. Harvey, M.R. Mackley, T. Seliger. “Operation and optimization of an oscillatory flow continuous reactor” Ind Eng Chem Res, 40 (23) (2001), pp. 5371–5377
OFR Technology - Mini-fluidic scale
• Can the same benefits be achieved in mini-fluidic channels without prohibitive energy loss?
• Application for shear dependent chemistry
• Solids Handling & flow pattern control
• Contactor Design for OFR: Not just baffles at this scale…
Preliminary Evaluation
• Heat transfer analysis through scaling of conventional correlations – representative of mixing
(Not to scale)
• Assumed properties of water
Nu vs. Re (for Water)
Based on correlations from
Nu vs. Energy Dissipation
Reo/Re ranging from:0.2 at high Re to 4 at low Re
Comparison to Other Geometries?
dh ~ 0.67 mmdh ~ 1mm
Corning “Heart” reactor
Data from Plouffe P., Anthony R., Donaldson A., Roberge D.M., Kockmann N., Macchi A., ICNMM 2012
Current Efforts
• Development and characterization of a “high-frequency” oscillating pressure field generator (0 to 30 hz) with significant displacement capabilities
• Combined CFD and experimental analysis of contactor designs specifically for Oscillatory flow
Experimental System in Development
• Design of coupled high-speed switching device for alternating the pressure field
• Resistance model & characterization of flow (fluid displacement vs. time under oscillatory conditions)
Modular Fluidic Platform
• Fluidic platform integrated with high-resolution rapid prototypingcapabilities to construct and testnew geometries
• Capable of 3D printswith 20-100 μm practical resolution
Questions?
Graduate Positions Available:MASc Fundamental contactor design for minifluidic OFR
technology – Manufacture, Measurement & Simulation
PhD Design and optimization of mini-fluidics based vacuum steam extraction technology for food-grade oil deodorization
Description of Conventional Correlations
References1. P.Stonestreet and A.P.Harvey. “A mixing based design methodology for
continuous oscillatory flow reactors" Trans.I.Chem.Engg. 80, pp 31-44, 2002.2. A.P. Harvey, M.R. Mackley, T. Seliger. “Process intensification of biodiesel
production using a continuous oscillatory flow reactor” Journal of ChemicalTechnology and Biotechnology, 78 (2–3) (2003), pp. 338–341.
3. A.P. Harvey, M.R. Mackley, T. Seliger. “Operation and optimization of anoscillatory flow continuous reactor” Ind Eng Chem Res, 40 (23) (2001), pp. 5371–5377.
4. Norbert Kockmann and Dominique M.Roberge. “ Scale-up concept for modularmicro structured reactors based on mixing, heat transfer and reactor safety”Chemical Engineering and Processing, 50, 1017-1026,2011.
5. M.R. Mackley and P.Stonestreet. “Heat Transfer and Associated EnergyDissipation for Oscillatory flow in Baffled tubes” Chemical Engineering Science,50,14,2211-2224,1995.
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