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The Effect of Random Roughness on Fluid Flow in Microfluidic Channels

The Effect of Random Roughness on Fluid Flow in Microfluidic Channels. Roslyn Melookaran. Department of Mechanical Engineering Dr. Sundararajan, Jing Ren. Motivation. Microchannels are seen in many areas of engineering throughout the world Ink Jet printers Bio-analytical Instruments

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The Effect of Random Roughness on Fluid Flow in Microfluidic Channels

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  1. The Effect of Random Roughness on Fluid Flow in Microfluidic Channels Roslyn Melookaran Department of Mechanical Engineering Dr. Sundararajan, Jing Ren

  2. 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 Measurments of a Microchannel Flow (1999) http://www.product-reviews.net/wp-content/userimages/2008/01/kodak-easyshare-5300-multifunction-ink-jet-printer.jpg

  3. Experiments in the Past • The majority of experiments in the past have dealt with the effects that predetermined roughness has on fluid flow. James T; Carrano A; Kandlikar S. Characterization of the effect of surface roughness and texture on fluid-Past, Present, and Future (2006). Fewhave studied the effect that random roughness has on fluid flow.

  4. Objectives • Learn the fabrication process of microchannels • Learn the Particle Image Velocimetry (PIV) technique. • Use PIV to study the effects of random roughness in microchannels created by hydrofluoric etching.

  5. Fabrication of Microfluidic Channel • 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. PDMS SU-8 PDMS SU-8 Chow W, Lei K, Shi G, Li W, Huang Q. Microfluidic Channel Fabrication by PDMS-Interface Bonding (2006)

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

  7. Current Work • Latest experiment was the 30 minute etching channels. • Invalid because there was too much noise • Air bubble through the system

  8. Current Work Vx (Transverse) ROUGH SMOOTH Vy (Stream wise)

  9. Current Work Vx (Transverse) ROUGH SMOOTH Vy (Stream wise)

  10. Work for the Rest of the Summer…. • Analysis of the PIV data using • Davis Software • Matlab • Continue compiling all the data in one place for the purpose of comparison • PIV data collection on the 20 minute etched glass. (If time allows)

  11. QUESTIONS?

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