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An Experimental Study on Liquids Separation by Thermal diffusion Method and it’s Simulation by Computational Fluid Dynamics

Abdinezhad, Fatemeh | 2021

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 53763 (46)
  4. University: Sharif University of Technology
  5. Department: Energy Engineering
  6. Advisor(s): Uotokesh, Mohammad; Karimi Sabet, Javad
  7. Abstract:
  8. Thermal penetration is one of the separation methods. In this process, due to the temperature difference, the concentration gradient in one of the gas or liquid phases in the resulting system and the relative separation of the components is possible. The column used for this work is the Classius-Dickel column. This column consists of two vertical plates, one warm and the other cold, spaced a short distance apart. Due to the temperature gradient, the gradient is deliberately created, which creates a concentration gradient in the column, so that the light component accumulates at the top of the column and the heavy component at the bottom of the column. The difference in concentration between the top and bottom of the column causes the separation of the desired compound. Organic, hydrocarbon, azeotropic, and organic compounds can be separated by this method. In the present study, the thermal diffusion column has been investigated for the separation of binary compounds. Column performance was also simulated by computational fluid dynamics software. Materials and Methods: In laboratory work, a normal heptane-toluene mixture was selected as feed using a column previously made based on articles, and the effects of cold wall temperature, vertical separation column angle and normal weight percentage of heptane in the feed were selected. , Was examined. In all laboratory stages, the feed and cut-off flow rate is constant and is approximately equal to 1ml / min and 0.5. In the simulation by computational fluid dynamics method, ansys fluent software was used. Conclusion: Feed with three different weight percentages (50%, 10%, 5%) of normal heptane entered the column, the highest rate of separation was related to 50% feed and the lowest occurred in 5% feed. The effect of cold wall on the rate of separation In a situation where the temperature difference between hot and cold wall is constant and equal to 50 ° C base, we investigated at three temperatures of 5, 10 and 15 ° C base that the best rate of separation was obtained at lower wall temperature. Also, the separation column was examined in three different angles of 25, 40 and 55 degrees from the vertical position and the most separation was performed at an angle of about 40 degrees in 50% feed, which is more than the vertical position of the column. Using the experimental design software, the optimal state in the separation process was determined and the feed with 45.43% by weight of normal heptane at 5.163 ° C cold wall base and 29.427 ° column angle from the vertical, gives us the optimal separation. Also, using ounce fluent software, all of the above were examined, which is consistent with the results obtained in vitro, with a difference of about 20%
  9. Keywords:
  10. Computational Fluid Dynamics (CFD) ; ANSYS Software ; Fluent Software ; Classius-Dickel Column ; Liquids Thermal Diffusion ; Thermal Emission

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