Skip to main content

Improvement in operating efficiency of falling-film evaporators

A procedure is outlined for determination of the basic dimensions of falling-film evaporators, which will result in their rational design. It is proposed to calculate the basic dimensions of the evaporator as a function of various factors such as the reflux density of the pipes containing the solution, steam separation, and heat losses. These factors determine the operating efficiency of both the vessel, and the evaporator on the whole. Recommendations for selection of the rational diameter and length of the heating tubes for falling-film vessels under different operating conditions are cited as an example.

This is a preview of subscription content, access via your institution.

Fig. 1
Fig. 2


  1. T. A. Kolach and D. V. Radun, Evaporation Plants [in Russian], Mashgiz, Moscow (1963).

    Google Scholar 

  2. J. Perry, Handbook for Chemical Engineers [Russian translation], Khimiya, Leningrad (1969), Vol. 1.

    Google Scholar 

  3. P. E. Minton, Handbook of Evaporation Technology, NP, Westwood (1986).

    Google Scholar 

  4. Yu. V. Kartovskii, L. A. Bolotov, V. B. Chernozubov, et al., “Intensification of heat exchange in vacuum separationbank equipment for alumina production,” Tsvetn. Met., No. 3, 34–37 (1977).

  5. V. M. Ronkin, M. B. Vaisblat, L. A. Minukhin, and V. M. Kovcel, “Selection of optimal operating regimes for fallingfilm evaporators during concentration of aluminate solutions,” Proc. 9th Conf. Urals Aluminum – 2004 [in Russian], Krasnoturyinsk (2004), pp. 65–67.

  6. V. M. Ronkin and V. M. Kovzel, “Use of different types of evaporators for concentration of aluminate solutions in alumina production,” Khim. Prom. Segodnya, No. 3, 47–56 (2011).

  7. H. R. Kueng, “Evaporation and concentration process applied today in caustic soda production – product form available,” Chem. Age India, 23, No. 6, 522–527 (1972).

    CAS  Google Scholar 

  8. E. G. Vorontsov and Yu. M. Tananiko, Heat Exchange in Liquid Films [in Russian], Tekhnika, Kiev (1972).

    Google Scholar 

  9. V. M. Ronkin,V. M. Kovzel,V. I. Levearsh, et al., “Refinement of evaporator designs to improve operating efficiency of evaporator banks for alumina production,” Proc. 4th Conf. Urals Aluminum – 1999 [in Russian], Krasnoturyinsk (1999), pp. 44–48.

  10. V. I. Leverash, I. F. Davydov, S. I. Golub, et al., “Experimental investigations of carry-off on models of falling-film evaporators,” Vopr. At. Nauki Tekhn. Ser. Opresn. Sol. Vod, TsNIIATOM-INFORM, Moscow (1974), Iss. 1, pp. 26–34.

  11. S. S. Kutatelzdze and Yu. L. Korokin, “Hydrostatic stability of certain systems,” in: Problems of Heat Transfer and Hydraulics of Dual-Phase Media [in Russian], Gosenergoizdat, Moscow (1961), pp. 315–324.

    Google Scholar 

  12. S. S. Kutateladze and M. A. Styrikovich, Hydrodynamics of Gas–Liquid Systems [in Russian], Energiya, Moscow (1976).

    Google Scholar 

  13. I. F. Davydov and A. M. Rozen, “Critical conditions of carry-off formation in dual-phase evaporator flows,” Vopr. At. Nauki Tekhn. Ser. Opresn. Sol. Vod, Sverdlovsk (1977), Iss. 9, pp. 42–49.

  14. S. I. Golub, V. B. Chernozubov, et al., “Quality of distillate subject to thermal desalinization of natural water at nuclear and thermal power plants,” Tr. SverdNIIkhimmash, Yekaterinberg (2001), Iss. 72, pp. 41–54.

  15. M. A. Kichigin and G. N. Kostenko, Heat Exchangers and Evaporators [in Russian], Gosenergoizdat, Moscow–Leningrad (1955).

    Google Scholar 

  16. A. A. Aleksandrov and B. A. Grigoriev, Tables of Thermophysical Properties of Water and Water Vapor [in Russian], Izd. MEI, Moscow (2003).

    Google Scholar 

Download references

Author information

Authors and Affiliations


Additional information

Translated from Khimicheskoe i Neftegazovoe Mashinostroenie, No. 9, pp. 7–9, September, 2012.

Rights and permissions

Reprints and Permissions

About this article

Cite this article

Ronkin, V.M. Improvement in operating efficiency of falling-film evaporators. Chem Petrol Eng 48, 540–545 (2013).

Download citation

  • Published:

  • Issue Date:

  • DOI:


  • evaporation systems
  • falling-film evaporators
  • heating tubes
  • reflux density
  • evaporated water
  • dual-phase flow
  • steam separation
  • diameter and length of tubes
  • heat losses