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Investigation of Drop Phase Mass Transfer Coefficient During Rising Drops in a Pulse Sieved Plate Column in Presence of Nano Particles

Khoobi, Nafiseh | 2010

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 42378 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Bastani, Daruoosh; Bahmanyar, Hossein
  7. Abstract:
  8. Nanofluids are new engineering materials with great potential for application in process industries. Their enhanced heat-transfer properties are reported in recent literatures. However, with respect to the influence of nanoparticles on mass transfer characteristics, limited number of studies available in the literature, deal primarily with gas-liquid systems. In this work, mass transfer performance and droplet behavior along a pulsed liquid-liquid extraction column, is studied where SiO2 nanoparticles with concentrations of 0.01, 0.05 and 0.1 vol% and different hydrophobicities are applied to the dispersed phase. Using ultrasonication, nanoparticles were dispersed in kerosene as the base fluid. Nanofluids stabilities was ensured using a UV–vis spectrophotometer. Some 12000 droplets were measured by photographic technique and results were compared with systems containing no-nanoparticles (Water–Acetic acid–Kerosene). Pulsation was obtained via a newly designed pulsator which was specifically designed and built for this type of research works offers the advantages of 1 ms accuracy in pulsation time, and does not require maintenance of mechanical pump pulsators, nor suffers from the limitations of airlift pulsators. The results indicate that in the presence of the nanofluids, interfacial area and volumetric mass transfer coefficient increased by 96–249%, and 14–118%, respectively, while efficiency was enhanced by 4 to 60%. Addition of nanoparticles changed the droplet shape from ellipsoidal to spherical
  9. Keywords:
  10. Nanofluid ; Mass Transfer Coefficient ; Separation Efficiency ; Pulsed Sieve-Plate Extractor ; Interfacial Area ; Sauter Mean Diameter

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