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Iowa State University College of Engineering SPEED Program Summer Program for Enhancing Engineering Development. SPEED. The Effect of Random Roughness on Fluid Flow in Microfluidic Channels. Roslyn Melookaran MoSAIc Department of Mechanical Engineering Dr. Sundararajan, Jing Ren. SPEED.

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the effect of random roughness on fluid flow in microfluidic channels
Iowa State University College of EngineeringSPEED ProgramSummer Program for Enhancing Engineering Development

SPEED

The Effect of Random Roughness on Fluid Flow in Microfluidic Channels

Roslyn Melookaran

MoSAIc

Department of Mechanical Engineering

Dr. Sundararajan, Jing Ren

outline

SPEED

Outline

-Introduction/Motivation

-Past experiments

-Objectives

-Fabrication process

-Particle Image Velocimetry (PIV)

-Results

-Conclusion

-Acknowledgments

-Speed Experience

motivation
Motivation

Microchannels are seen in many areas of engineering throughout the world

Ink Jet printers

Bio-analytical Instruments

Fluid Logic systems

A particular issue with these microchannels is that their decreased size allows for surface roughness to have an increased affect on fluid flow.

Meinhart C D; Wereley S T; Santiago J G. PIV Measurements of a Microchannel Flow (1999)

experiments in the past
Experiments in the Past
  • The majority of experiments in the past have dealt with the effects that predetermined roughness has on fluid flow.
  • Few have studied the effect that random roughness has on fluid flow.

SPEED

James T; Carrano A; Kandlikar S. Characterization of the effect of surface roughness

and texture on fluid-Past, Present, and Future (2006).

objectives

SPEED

Objectives

Gain an understanding of micro fluidic devices, and how they are fabricated through research and observation in the lab.

Gain an understanding of the PIV technique.

Investigate the effect of random roughness on micro channel fluid flows using the PIV technique.

Become familiarized with the PIV data analysis and presentation

fabrication process

PDMS

1.

SU-8

2.

Fabrication Process

3.

Mix Polydimethylsiloxane (PDMS) curing agent to PDMS monomers- 1:10 ratio

Degas in a vacuum for about an hour depending on the amount.

Pour liquid PDMS onto a surface containing negative of the pattern (SU-8 layered on silicon wafer).

Place the PDMS in curing oven for 4 to 8 hours

Remove PDMS from wafer, and cut excess PDMS off.

Bond the PDMS with clean glass slide using plasma bonder.

SU-8

PDMS

PDMS

SU-8

4.

PDMS

Etched

Glass

Slide

slide7

SMOOTH ROUGH

L

1

L

z-m dx

Ra=

0

SPEED

particle image velocimetry piv

SPEED

Particle Image Velocimetry (PIV)

The camera is continuously taking pictures within time intervals as short as 500ns.

Using the images taken, the displacement is estimated for the particle’s movement.

slide9

CHANNEL

2.5 cm

SPEED

Middle

Of

Channel

200 μm

GLASS SLIDE

slide10

SMOOTH

ROUGH

SPEED

8 µm above surface

slide11

SMOOTH ROUGH

SPEED

8 µm above surface

slide12

SMOOTH ROUGH

SPEED

MIDDLE

slide13

SMOOTH ROUGH

SPEED

MIDDLE

conclusion future work

We found that this random roughness does have an effect on fluid flow.

  • No one has ever studied this before
      • What I’ve learned
    • Research process
    • PIV technique
    • What surface roughness is
      • Parameters used to measure it
      • PATIENCE!
      • Future Work
        • Test the channels with lower velocities

SPEED

Conclusion&Future Work
acknowledgments

Dr. Sundararajan & Jing Ren

  • Research Experience for Undergraduates (REU)
  • The SPEED Program
    • Dr. Rollins
    • Lynn Lundy Evans
    • Laura Centeno-Diaz
    • Counselors – Isaac, Lindsey, Christine
    • All the SPEED participants
Acknowledgments
slide17

SPEED

STRAWberry Construction!!!