Application of Particle Imaging Method for Measurement of Solid Volume Fraction in Carbon Nanotube Particles Fluidized Bed

 
 
 
  • Abstract
  • Keywords
  • References
  • PDF
  • Abstract


    Solid volume fraction in the carbon nanotube (CNT) fluidized bed reactors is an important parameter which is responsible of fluidization quality and the design of reactor. The solid volume fraction can be obtained from the pressure drop across the bed with the information of gas and particle densities. However, previous method such as the Hg-porosimetry for the measurement of the particle density did not adequately draw the solid volume fraction of the CNT aggregates with entangled nanotubes network. A new method to measure the apparent particle density of the CNT aggregates was proposed to calculate the solid volume fraction in the CNT fluidized bed. The density of the vertically aligned CNT particle was measured based on the apparent volume by shape analysis using two dimensional imaging. The solid fraction based on imaging method showed a significant value of 0.69 for the fixed bed, which describes well the entangled structure of the CNT aggregates. The distribution of solid volume fraction in the CNT fluidized bed with variation of gas velocity was determined based on the imaging method. The method was verified by applying the obtained values to the Richardson-Zaki equation on the bed expansion in the fluidized bed.

     

     


  • Keywords


    Carbon nanotube, Fluidized bed, Solid volume fraction, Particle density, Imaging, Shape analysis.

  • References


      [1] Wang Y, Wei F, Luo G, Yu H & Gu G (2002), The Large-Scale Production of Carbon Nanotubes in a Nano-Agglomerate Fluidized-Bed Reactor. Chemical Physics Letters 364, 568-572.

      [2] Jeong SW, Lee JH, Kim J & Lee DH (2016), Fluidization behaviors of different types of multi-walled carbon nanotubes in gas-solid fluidized beds. Journal of Industrial and Engineering Chemistry 35, 217-223.

      [3] Lee MJ, Park SH & Kim SW, “Hydrodynamics of Vertically Aligned Carbon Nanotube Particles in a Fluidized Bed”, Proceedings of 23th International Conference on Fluidized Bed Conversion, (2018), pp. 1220-1225.

      [4] Khurram MS, Choi J, Ahmad I, Memon, SA, Shahzad K, Ghauri M, Rafiq S, Jaffery MH & Doggar MG (2018), Correlation for Predicting Solid Holdup in the Circulating Fluidized Bed Riser. Journal of Engineering Technology 6, 283-292.

      [5] Yang W (2003), Handbook of Fluidization and Fluid-Particle Systems. Marcel Deckker Inc., New York, US, pp. 6.

      [6] Jeong SW & Lee DH (2017), Estimation of agglomerate size of multi-walled carbon nanotubes in fluidized beds. Advanced Powder Technology 28, 2706-2712.

      [7] Kim SW (2017), Measurement of carbon nanotube agglomerates size and shape in dilute phase of a fluidized bed. Korean Chemical Engineering Research 55, 646-651.

      [8] Yu H, Zhang Q, Gu G, Wang Y, Luo G & Wei F (2006), Hydrodynamics and gas mixing in a carbon nanotube agglomerate fluidized bed. AIChE Journal 52, 4110-4123.

      [9] Richardson JF & Zaki WN (1954), Sedimentation and fluidization Part I. Transactions of the Institutetution of Chemical Engineers 32, 35-53.

      [10] Phanthuna N & Cheevasuwit F (2015), Contrast image enhancement using multi-histogram equalization. The International Journal of Advanced Culture Technology 3, 161-170.

      [11] Yu SW (2016), Digital image enhancement algorithm. The International Journal of Advanced Culture Technology 4, 48-55.

      [12] Rasband WW (1997), Image J, U.S. National Institute of Health, Bethesda, Maryland, US. Retrieved from http://rsb.info.nih.gov/ij/.

      [13] Kim SW (2018), Effect of Particle Size on Carbon Nanotube Aggregates Behavior in Dilute Phase of a Fluidized Bed. Processes 6, 121.

      [14] Kunii D & Levenspiel O (1991), Fluidization Engineering, 2nd ed. Butterworth-Heinemann, MA, US, pp. 61-94.

      [15] Kim SW & Kim SD (2018), Void Properties in Dense Bed of Cold-Flow Fluid Catalytic Cracking Regenerator. Processes 6, 80.

      [16] Zhu C, Yu Q, Dave RN & Pfeffer R (2005), Gas fluidization characteristics of nanoparticle agglomerates. AIChE Journal 52, 426-439.

      [17] Yao W, Guangsheng G, Fei W & Jun W (2002), Fluidization and agglomerate structure of SiO2 nanoparticles. Powder Technology 124, 152-159.

      [18] Allen HS (1900), The motion of a sphere in a viscous fluid. Philosophical Magazine 50, 519-534.


 

View

Download

Article ID: 18530
 
DOI: 10.14419/ijet.v7i3.33.18530




Copyright © 2012-2015 Science Publishing Corporation Inc. All rights reserved.