Drag Reduction Efficiency of Red Algal Extracellular Polysaccharides Yang He Russell School of Chemical Engineering.

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Presentation transcript:

Drag Reduction Efficiency of Red Algal Extracellular Polysaccharides Yang He Russell School of Chemical Engineering

Overview Industrial drag reducing agent(DRA) and drag reduction efficiency test Red algal polysaccharides Results

Drag Reducing Agents(DRA): Long chain polymer chemicals that when injected into a pipeline where the fluid is turbulent modifies the flow regime by reducing the frictional pressure drop along the pipeline length

Algal polysaccharides used in this study Red microalgae Porphyridium sp. polysaccharides (P. cruentum and P. aerugineum) Red microalgae polysaccharide agarose (Agar)

Red microalgae Porphyridium sp. polysaccharides extraction procedure Grow Porphyridium sp. in the shaker/bioreactor for weeks Centrifuge the liquid to get the supernatant out Add 0.05M NaCl and 0.1% CPC into supernatant and incubate in 40 °C shaker for 24h Wash with DDH 2 O in 40 °C shaker for 24h Precipitate in 3 vols cold ethanol Solubilize in 2M CaCl2, agitate at 40 °C shaker for 24h

Tank Pipe Pump

Experimental settings  Diameter: 1/2 in. copper  Length: 8 ft  Total volume: 40 L  Pump capacity: 0.75 hp  Concentration: tested by phenol-sulfuric acid carbohydrates assay  Reynolds: (flow rate 4.67 gal / min)

Drag in a pipe system calculation Darcy-Weisbach equation Generally definition of percentage drag reduction

Effect of Polysaccharide Concentration for Industrial Used Gums

Effect of Polysaccharide Concentration for Red Microalgae Porphyridium cruentum.

Drag Efficiency Comparison of Red Algal Polysaccharides and industrial gums

Porphyridium aerugineum ppm Drag reduction efficiency 155.4% 156.5% 154.3% 155.6% 155% Red Microalgae Porphyridium aerugineum Production & Drag Reduction Efficiency * J. Ramus The production of extracellular polysaccharide by the unicellular red alga porphyridium aerugineum. J. Phycol. 8, Production of polysaccharide in stationary phase is about 4mg/L

Effect of Polysaccharide Concentration for Agar

Drag Efficiency Comparison of Red Algal Polysaccharide

Chemical Structure of different polysaccharides Red microalgae Porphyridium sp. polysaccharides (P. cruentum and P. aerugineum) Red microalgae polysaccharide agarose (Agar) Xanthan gum Guar gum

 Production of Prophyridium sp. Polysaccharides is limited  Red microalgae Prophyridium sp. polysaccharides have the potential to be used as DRAs but not all of the algal extracellular polysaccharides works Conclusion

Summary

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