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Solid-Liquid Mass Transfer in the Annular Region of a Taylor-Couette Contacting Device

Faraji Dizaji, Naeimeh | 2009

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 39319 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Molaei Dehkordi, Asghar
  7. Abstract:
  8. Vortex flow reactor (VFR) is used for biochemical reactions and separation applications. By using the second flow regime, called Taylor-Couette flow, VFR provides high amounts of mass transfer and mixing for biological components sensitive to shear stress. Mass transfer in a bench-scale Taylor-Couette contactor with a radius ratio, equal to 0.77 and an aspect ratio, equal to 30.7 was studied for solid particles dissolution. The working fluid was water and the suspended particles were benzoic acid. In this project the concentration of fluid phase was measured by injection of definite amount of the solid particles in to the contactor and sampling in different time intervals and the effects of the particle size, the temperature and the rotation rate of the inner cylinder on mass transfer coefficient were investigated. The mass transfer coefficients were compared to the values given by Resende equation. The offset of experimental data is related to effects of axial flow and the range of residence time and for higher values of τ in Resende equation. The results show that the radial mixing in Taylor flow without axial flow has an efficient effect on mass transfer and increasing of Taylor number results the increasing of mass transfe4r coefficient. Also increasing of temperature decreases the mass transfer coefficient
  9. Keywords:
  10. Mass Transfer Coefficient ; Taylor-Couette Flow ; Solid-Liquid Mass Transfer

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