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Two-phase flow instabilities in a horizontal single boiling channel

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Abstract

A study of the stability of an electrically heated single channel, forced convection horizontal system was conducted by using Freon-11 as the test fluid. Two major modes of oscillations, namely, density-wave type (high frequency) and pressure-drop type (low frequency) oscillations have been observed. The steady-state operating characteristics and stable and unstable regions are determined as a function of heat flux, exit orifice diameter and mass flow rate. Different modes of oscillations and their characteristics have been investigated. The effect of the exit restriction on the system stability has also been studied.

A mathematical model has been developed to predict the transient behavior of boiling two-phase systems. The model is based on homogenous flow assumption and thermodynamic equilibrium between the liquid and vapor phases. The transient characteristics of boiling two-phase flow horizontal system are obtained for various heat inputs, flow rates and exit orifice diameters by perturbing the governing equations around a steady state. Theoretical and experimental results have been compared.

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Abbreviations

A :

area, m2

C 1,C 2 :

constants

G :

mass flux, kg/m2s

h :

enthalpy, J/kg

K :

loss coefficient

L b :

boiling length, m

L h :

heater length, m

L ph :

preheater length, m

L 1 :

length of region 1, m

L 2 :

length of region 2, m

m :

mass flow rate, kg/s

p :

pressure, N/m2

Δp s :

system pressure drop, from inlet of heater to exit, N/m2

q :

heat input rate per unit length, w/m

R :

V go ρ1/Ap to ,s 2/m

s :

complex variable, 1/s

τ :

residence time of liquid particle in preheater, s

t :

time, s

u :

velocity, m/s

V :

volume, m3

v :

specific volume, m3/kg

x :

quality

Z :

space variable, m

Δ :

perturbated quantity

δ :

Laplace-transformed perturbated quantity

Ω :

v fg q/h fg A, 1/s

ρ :

density, kg/m3

b :

boiling region

e :

exit

f :

saturated liquid

fg :

difference between the saturated liquid and gas

g :

saturated gas

l :

subcooled liquid

M :

main tank

or:

orifice

r :

restriction

t :

surge tank

1:

region 1

2:

region 2

References

  1. Stenning, A.H. and Veziroglu, T.N.: Flow oscillation modes in forced convection boiling.Proceedings of the 1965 Heat Transfer and Fluid Mechanics Institute. Stanford University Press (1965) pp. 301–306.

  2. Yadigaroglu, G. and Bergles, A.E.: An experimental and theoretical study of density-wave oscillations in two-phase flow.MIT Report DSR74629-3 (1969).

  3. Ishii, M. and Zuber, N.: Thermally induced flow instabilities in two-phase mixtures.4th International Heat Transfer Conference, Paris, Paper B5-11 (1970).

  4. Quandt, E.R.: Analysis and measurement of flow oscillations.Chemical Engineering Progress Symposium Series, No. 32, Vol. 57 (1960).

  5. Wallis, G.B. and Heasley, J.H.: Oscillations in two-phase flow systems.Journal of Heat Transfer 83 (1961) 363.

    Google Scholar 

  6. Meyer, J.E. and Rose, R.P.: Application of a momentum integral model to the study of parallel channel boiling flow oscillations.J. Heat Transfer, ASME, Series C, 85 (1963) 1.

    Google Scholar 

  7. Maulbetsch, J.S. and Griffith, P.: A study of system-induced instabilities in forced-convection flows with subcooled boiling.MIT, Mechanical Engineering Department (1965).

  8. Shotkin, L.M.: Stability considerations in two-phase flow.Nuclear Science and Engineering 28 (1967) 317–324.

    Google Scholar 

  9. Stenning, A.H. and Veziroglu, T.N.: Oscillations in two-component two-phase flow.Final Report, NASA CR-72121 (1967).

  10. Kakaç, S. Veziroglu, T.N., Akyüzlü, K. and Berkol, O.: Sustained and transient boiling flow instabilities in a cross-connected four parallel channel upflow system.5th International Heat Transfer Conference, Paper no. B5.11, Tokyo (1974).

  11. Kakaç, S., Veziroglu, T.N., Ozboya, N. and Lee, S.S.: Transient boiling flow instabilities in a multichannel upflow system.Wärme und Stoffubertragung 10 (1977) 175–188.

    Google Scholar 

  12. Kakaç, S. Veziroglu, T.N., Ergur, H.S. and Uçar, I.: The effect of inlet subcooling on sustained and transient boiling flow instabilities in a single channel upflow system.6th International Heat Transfer Conference, Toronto (1978).

  13. Veziroglu, T. N. and Kakaç, S.: Two-phase flow instabilities and effect of inlet subcooling.Final Report, NSF Project Eng. 75-16618.

  14. Bouré, J. A., Bergles, A. E. and Tong, L.S.:Review of Two-Phase Flow Instability, Nuclear Engineering and Design 25. North-Holland Publishing Company (1973) pp. 165–192.

  15. Yadigaroglu, G.: Two-phase flow instabilities and propagation phenomena. In: Delhaye, J.M., Giot, M. and Riethmuller, M.L. (eds)Thermodynamics of Two-Phase Systems for Industrial Design and Nuclear Engineering. New York: Hemisphere Publishing Corporation (1981).

    Google Scholar 

  16. Bergles, A.E. and Ishigai, S. (eds):Two-Phase Flow Dynamics. New York: Hemisphere Publishing Corporation (1981).

    Google Scholar 

  17. Veziroglu, T.N. and Kakaç, S.: Two-phase flow instabilities.Final Report, NSF CME 79-20018 (1982).

  18. Yüncü, H. and Kakaç, S.: Fundamentals of two-phase flow instabilities. In: Kakaç, S., Bergles, A.E., and Fernandes, E.O. (eds),Two-Phase Flow Heat Exchangers. Dordrecht: Kluwer Academic Publishers (1988).

    Google Scholar 

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Authors and Affiliations

  1. Mechanical Engineering Dept., Middle East Technical University, 06531, Ankara, Turkey

    H. Yüncü

  2. University of Miami, Coral Gables, Florida, USA

    O. T. Yildirim & S. Kakaç

Authors
  1. H. Yüncü
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  2. O. T. Yildirim
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  3. S. Kakaç
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Yüncü, H., Yildirim, O.T. & Kakaç, S. Two-phase flow instabilities in a horizontal single boiling channel. Appl. Sci. Res. 48, 83–104 (1991). https://doi.org/10.1007/BF01998667

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  • DOI: https://doi.org/10.1007/BF01998667

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