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Microfluidics and Valve Design

Microfluidics and Valve Design. Mark Barineau Ryan Slaughter. Lincoln Laboratory goals Micro- and Macroscale Fluidics Governing Physics Valve and Actuator Types Related Technologies Butane/LPG Properties FEA Intro. Presentation Overview. Critical Findings.

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Microfluidics and Valve Design

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  1. Microfluidics and Valve Design Mark Barineau Ryan Slaughter

  2. Lincoln Laboratory goals Micro- and Macroscale Fluidics Governing Physics Valve and Actuator Types Related Technologies Butane/LPG Properties FEA Intro Presentation Overview

  3. Critical Findings • Distinction between microfluidics and microvalves • Applicable valve, actuator, and sensor technologies have been developed • Butane/LPG is a good choice

  4. LL: Fuel Metering Valve • Need compact, low-mass system to meter fuel flow in prototype TE microgenerator system • Relevant to other micropower applications, as well • Design goals: • Automatic control to accommodate varying electrical loads • Compensate for fuel vapor pressure • Integration into fuel tank plumbing • Very low mass: < 10 grams including tank adapter • Very low power: < 50 mW • Operability with LPG fuels: butane and propane • Act as compact massflow controller

  5. LL: Candidate Performance Specification

  6. FuelMass Flow FuelPvap(T) Temp Pressure Regulator Low FrequencyDC modulation Flow Regulator Pulse WidthModulated Valve Controller Flow SP • Rough concept for initial performance requirements • Actual requirements driven by more thorough design review LL: Valve Concept

  7. Fluid reservoir Actuator Restrictive element Sensor(s) Controls Interconnects Valve Components

  8. Microfluidic—devices and/or flow characteristics Knudsen number Kn<0.3, Continuity Kn>0.3, Statistical mechanics Micro- vs. Macrofluidics

  9. Navier-Stokes Eq. Mass Continuity Reynolds Number Fluids (2.005) Review

  10. High heat of combustion (~50 MJ/kg) Stable storage and manipulation Clean burn Reliable, cost-effective valve solutions exist Safe for lab use => gas detection tools available Working Fluid: Butane, LPG

  11. Butane Properties* • Density: • 2.46 kg/m3 gas (288 K) • 600 kg/m3 liquid (272 K) (roughly half that of H20) • MP: 135.4 K, BP: 272.6 K • Flash Point: 213 K • Auto-ignition Temp: 773 K • Cost: ~0.70 $/gal *all values for 1 atm

  12. Butane Properties

  13. Butane Properties

  14. Butane Properties

  15. Butane Properties

  16. Fundamentals of FEA

  17. Conclusions • Microfluidics/Valve to Fluidics/Microvalve • Applicable valve, actuator, and sensor technologies are available for our device • Butane/LPG is a reasonable fuel

  18. Next Steps • System concept/design refinement • Confirm valving liquid or gas • Actuation • Closed Loop Sensing/Controls • Learn from other groups (especially related to DFM)

  19. Questions?

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