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Underwood Equations – (L/D) min

Underwood Equations – (L/D) min. We have looked at one limiting condition, N min , determined using the Fenske method at total reflux conditions.

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Underwood Equations – (L/D) min

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  1. Underwood Equations – (L/D)min • We have looked at one limiting condition, Nmin, determined using the Fenske method at total reflux conditions. • The other limiting condition for multi-component systems is the solution for the minimum reflux ratio, (L/D)min, which gives us an infinite number of stages. • This method is known as the Underwood method or the Underwood equations. Lecture 18

  2. Underwood Equations – (L/D)min Lecture 18

  3. 1st Underwood Equation – φ Roots Lecture 18

  4. Underwood Equations – Cases Lecture 18

  5. Underwood Equations – Case A Methodology Lecture 18

  6. Underwood Equations – Case A Methodology (continued) Lecture 18

  7. Underwood Equations – Case A Methodology (continued) Lecture 18

  8. Underwood Equations – Case B Methodology Lecture 18

  9. Underwood Equations – Case B Methodology (continued) Lecture 18

  10. Underwood Equations – Case B Methodology (continued) Lecture 18

  11. Underwood Equations – Case C Methodology Lecture 18

  12. Underwood Equations – Case C Methodology (continued) Lecture 18

  13. Underwood Equations – Case C Methodology (continued) Lecture 18

  14. Gilliland Correlation – N and NF • Empirical relationship which relates the number of stages, N, at finite reflux ratio, (L/D)actual to the Nmin and (L/D)min. • Nmin is determined from the Fenske equation. • (L/D)min is determined from the Underwood equations. Lecture 18

  15. Gilliland Correlation Lecture 18

  16. Gilliland Correlation – Curve Fits Lecture 18

  17. Gilliland Correlation – NF Lecture 18

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