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Experimental Study of a n Air Assisted Mist Generator and Its Application to CO 2 Capture

8 th International Conference on Multiphase Flow - 2013. Experimental Study of a n Air Assisted Mist Generator and Its Application to CO 2 Capture. Jiafeng Yao 1 , Shinji Furusawa 2 , Satoshi Nakakido 3 , Akimaro Kawahara 1 , Michio Sadatomi 1 1 Kumamoto University, Japan

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Experimental Study of a n Air Assisted Mist Generator and Its Application to CO 2 Capture

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  1. 8th International Conference on Multiphase Flow - 2013 Experimental Study of an Air Assisted Mist Generator and Its Application to CO2 Capture Jiafeng Yao1, Shinji Furusawa2, Satoshi Nakakido3, Akimaro Kawahara1, Michio Sadatomi1 1Kumamoto University, Japan 2Japan Marine United Corporation 3Kyushu University, Japan

  2. Outline Introduction Experiments & Methods Results & Discussion Conclusion

  3. Introduction-Background Air Cooling Pesticide Firefighting Harmful Gas Absorption

  4. Introduction-Mist generator • Compressed air is supplied to the inlet P2: Negative Pressure • Water is sucked automatically • Mist is generated and sprayed (Patented by Sadatomi & Kawahara, 2012) Essence of this mist generator: Bernoulli’s principle: Velocity increases, pressure decreases

  5. Experiments-Motivation 1. Optimize the middle sized generator (d/D)2 = 0.429 Performance ? DS = 7 mm ds = 4.58 mm Spray angle ? lout= ? DM = 14 mm dM = 9.16 mm 2. Compare the performance of the two sized generators 3. Apply the superior generator to CO2 capture

  6. Experiments-Facility Water level in the tank is the same as the generator Tubes are used to test spray distribution

  7. Experiments-CO2 capture (3) Remove the film (2) Release CO2 balloon (1) Spray mist for 5 min. (4) Test CO2 concentration

  8. Results-Test of outlet Length of the mixing chamber (lout) influences the water sucking force and atomization efficiency. Pneumatic power consumption: Atomization efficiency: (Sadatomi et al. 2007) lout41 and 44.5 has a higher atomization efficiency than the others.

  9. Results-Test of outlet Length of the mixing chamber (lout) influences the water sucking force and atomization efficiency. lout44.5 generates the largest water flow rates in high efficiency with the smallest SMD.

  10. Results-Spray angle expansion Two groups of propellers with different blade numbers and outer diameters are used to expand the spray angle. Distance from center [cm] SMD[mm] No propeller: 46.7 b3d50: 30.3 b4d50: 25.7 b4d50 propeller can expand the spray uniformly with a more stable rotating action and smaller SMD.

  11. Results-Spray angle expansion Spraying without a propeller and with a propeller Propeller can expand the spray angle and decrease the diameters of droplets.

  12. Results-Comparison of two sized generators Two sized generators with the same proportion are compared. Double use of small The middle sized generator can produce stronger water suction force and mist generation rate, but consumes more power. So double use of the small one is recommended.

  13. Results-Application to CO2 capture Mist sprayed by small sized generator was used to absorb CO2. T: 24.5 ºC P: 757.3 mmHg 23 % A typical picture of droplets The mist sprayed by the small sized generator with b4d25 propeller can effectively reduce the indoor CO2 concentration to the harmless level of human health.

  14. Conclusion • The middle sized generator with lout = 44.5 mm expressed the best water suction performance and highest efficiency. • Middle sized generator with b4d50 propeller shows a good spray angle expansion performance and stable rotating action. • The middle sized generator has a stronger water suction performance but lower efficiency than the small sized one, so double use or multi-use of small one is recommended. • The mist can effectively reduce the indoor CO2 concentration within the harmlessness of human health.

  15. Thanks for your attention ! Jiafeng Yao Jiaf.yao@gmail.com Fluids Engineering Lab. Kumamoto University, Japan

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