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Dynamics of two-phase bubble-droplets in immiscible liquids

Dynamik zweiphasiger Blasen-Tropfen in unmischbaren Flüssigkeiten

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Abstract

This paper describes an experimental study of two-phase “bubble-droplets” of butane in distilled water. In the process of direct-contact heat transfer between two immiscible liquids, and with change of phase, evaporation occurs within a liquid droplet to form an interior bubble which ultimately may expand to absorb the entire droplet. The so-called “stopped-evaporation” two-phase bubble-droplets were formed by such evaporating droplets of butane rising in a column of water by application of pressure on the surface of the water to stop the evaporation. The configurations of such bubble-droplets, which depend on the ratio of mass of the vapor to mass of the liquid, are discussed. Results are also given for the rise velocity, and comparisons are made between the rise velocity of stopped-evaporation droplets and those of evaporating droplets.

Zusammenfassung

Die experimentelle Untersuchung von zweiphasigen Blasen-Tropfen aus Butan in destilliertem Wasser wird beschrieben. Bei direktem Wärmeaustausch mit Phasenänderung zwischen zwei unmischbaren Flüssigkeiten beginnt die Verdampfung innerhalb eines Flüssigkeitstropfens und bildet eine innere Blase, die sich schließlich ausdehnt und den Tropfen absorbiert. Ein Ende der Verdampfung konnte beim Aufsteigen von Butantropfen in eine Wassersäule durch Anlegen von Druck an der Wasseroberfläche erreicht werden. Die Struktur dieser Blasen-Tropfen, die abhängt vom Verhältnis der Massen des Dampfes und der Flüssigkeit, wird diskutiert. Außerdem werden Ergebnisse für die Aufstiegsgeschwindigkeit gegeben und die Aufstiegsgeschwindigkeiten der verdampfenden Tropfen mit denen bei beendeter Verdampfung verglichen.

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Abbreviations

d :

Equivalent spherical diameter of initial droplet (mm)

D :

Equivalent spherical diameter of bubble-droplet (mm)

m00 :

Initial mass of droplet (kg)

m v :

Mass of vapour (kg)

Re c :

Reynolds number based on water properties (Rec=ϱUD/μ)

t :

Time (s)

T c :

Temperature of water (°C)

U :

Rise velocity (m/s)

Z :

Position of bubble-droplet (mm)

Δt 0 :

Overall temperature difference (C deg)

ϱ :

Density (kg/m3)

μ :

Viscosity (kg/m s)

References

  1. Howe, E. D.: Fundamentals of water desalination. New York: Marcel Dekker, Inc. 1974

    Google Scholar 

  2. Rice, P. A.; Nene, R. G.; Barduhn, A. I.: Prediction of the heat transfer rates in crystallisers. 5th Int. Symp. on Fresh Water from the Sea 3 (1976) 285–291

    Google Scholar 

  3. Klipstein, D. H.: Heat transfer to a vaporising immiscible drop. D.Sc. Thesis; Massachusetts Institute of Technology (1963)

  4. Sidemann, S.; Taitel, Y.: Direct-contact heat transfer with change of phase: Evaporation of drops in an immiscible liquid medium. Int. J. Heat Mass Transfer 7 (1964) 1273 to 1289

    Google Scholar 

  5. Prakash, C. B.; Finder, K. L.: Direct contact heat transfer between two immiscible liquids during vaporisation. Part I: Measurement of heat transfer coefficient. Can. J. Chem. Engng. 45 (1967) 210–214

    Google Scholar 

  6. Adams, A. E. S.; Pinder, K. L.: Average heat transfer coefficient during the direct evaporation of a liquid drop. Can. J. Chem. Eng. 50 (1972) 707–713

    Google Scholar 

  7. Nazir, M.: Direct contact heat transfer, evaporation of butane drops in brine. Ph.D. Thesis, University of Strathclyde, Glasgow 1972

    Google Scholar 

  8. Simpson, H. C.; Beggs, G. C.; Nazir, M.: Evaporation of a droplet of one liquid rising through a second immiscible liquid. A new theory of the heat transfer process. Heat transfer process. Heat Transfer, Proc. 5th Int. Heat Transfer Conf. 5 (1974) 59–63

    Google Scholar 

  9. Tochitani, Y.; Mori, Y. H.; Komotori, K.: Vaporisation of single liquid drops in an immiscible liquid. Part I: Forms and motions of vaporising drops. Wärme-Stoffübertr. 10 (1977) 51–59

    Google Scholar 

  10. Tochitani, Y.; Mori, Y. H.; Komotori, K: Vaporisation of single liquid drops in an immiscible liquid. Part II: Heat transfer characteristics. Wärme-Stoffübertr. 10 (1977) 71–79

    Google Scholar 

  11. Selecki, A.; Gradon, L.: Equation of motion of an expanding vapour drop in an immiscible liquid medium. Int. J. Heat Mass Transfer 19 (1976) 925–929

    Google Scholar 

  12. Pinder, K. L.: Surface area prediction for two phase drops in an immiscible liquid. Can. J. Chem. Engng. 58 (1982) 318–324

    Google Scholar 

  13. Raina, G. K.; Grover, P. D.: Direct contact heat transfer with change of phase. Theoretical model. A.I.Ch.E. Journal 28 (1982) 515–517

    Google Scholar 

  14. Mercier, J. L.; da Cunha, F. M.; Teixeira, J. C.; Scofield, M. P.: Influence of enveloping water layer on the rise of air bubbles in newtonian fluids. J. Applied Mechanics, Trans. ASME 41 (1974) 29–34

    Google Scholar 

  15. Porter, W. F.; Richardson, F. D.; Subramanian, K. N.: Some studies of mass transfer across interfaces agitated by bubbles. Editor: Hills, A. W. D.: Heat and mass transfer in process metallurgy. London: The Institution of Mining and Metallurgy 1967 (79–111)

    Google Scholar 

  16. Hayakawa, T.; Shigeta, M.: Terminal velocity of two-phase droplet. J. Chem. Engng. of Japan 7 (1974) 140–142

    Google Scholar 

  17. Mori, Y. H.; Komotori, K; Higeta, K.; Inada, J.: Rising behaviour of air bubbles in superposed liquid layers. Can. J. Chem. Engng. 55 (1977) 9–12

    Google Scholar 

  18. Mori, Y. H.: Configurations of gas-liquid two-phase bubbles in immiscible liquid media. Int. J. Multiphase flow 4 (1978) 383–396

    Google Scholar 

  19. Mokhtarzadeh-Dehghan, M. R.: Study of an evaporating droplet in an immiscible liquid. Ph.D. Thesis, University of London, London 1980

    Google Scholar 

  20. Mokhtarzadeh, M. R.; El-Shirbini, A. A.: Motion of bubbles and bubble-droplets in an immiscible liquid. Wärme-Stoffübertr. 12 (1979) 25–33

    Google Scholar 

  21. Aybers, N. M.; Tapucu, A.: The motion of gas bubbles rising through stagnent liquid. Wärme-Stoffübertr. 2 (1969) 118 to 128

    Google Scholar 

  22. Mokhtarzadeh, M. R.; El-Shirbini, A. A.: A theoretical analysis of evaporating droplets in an immiscible liquid. Int. J. Heat Mass Transfer 22 (1979) 27–38

    Google Scholar 

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Authors and Affiliations

  1. Department of Mechanical Engineering, Brunei University, UB8 3PH, Uxbridge, Middlesex, England

    M. R. Mokhtarzadeh-Dehghan M.Sc., D.I.C., Ph.D. (Research Fellow)

  2. Department of Mechanical Engineering Imperial College of Science and Technology, SW7 2BX, London, England

    A. A. El-Shirbini M.Sc., D.I.C., Ph.D., M.I., Mech.E., C.Eng. (MCIBS Lecturer (retired)

Authors
  1. M. R. Mokhtarzadeh-Dehghan M.Sc., D.I.C., Ph.D.
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  2. A. A. El-Shirbini M.Sc., D.I.C., Ph.D., M.I., Mech.E., C.Eng.
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Mokhtarzadeh-Dehghan, M.R., El-Shirbini, A.A. Dynamics of two-phase bubble-droplets in immiscible liquids. Warme- und Stoffubertragung 19, 53–59 (1985). https://doi.org/10.1007/BF01682547

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