Dryout in annular flow - theoretical analysis

• Autorzy: Mikielewicz D. , Wajs J. , Gliński M. , Zrooga A.
• Języki publikacji: EN

Abstrakty

EN

In the paper a two-equation model of mass balance of liquid in the film and in the core for calculation of dryout at high vapour quality is modified from the earlier version presented by Sedler and Mikielewicz [1]. Additionally, the mass balance equation for the liquid film contains a modified evaporation term. Modified is the heat flux density applied in evaporation of liquid film which now is variable within film thickness. The solution of such equations requires prior knowledge of rates of deposition and entrainment. The theoretical determination of there quantities involves serious difficulties. The relations for determination of deposition and entrainment rate are taken therefore from Okawa et al. [3], The results of calculations are validated against experimental data of Sedler and Mikielewicz [1], showing a satisfactory consistency.

Słowa kluczowe

EN

annular flow; dryout; flow boiling

PL

osuszenie; przepływ dyspersyjno-pierścieniowy; wrzenie w przepływie

• Wydawca: Wydawnictwo Instytutu Maszyn Przepływowych PAN ; Komitet Termodynamiki i Spalania PAN
• Czasopismo: Archives of Thermodynamics
• Rocznik: 2009
• Tom: Vol. 30, no. 2
• Strony: 77--90
• Opis fizyczny: Bibliogr. 13 poz.,Rys., tab., wykr., wz.

Twórcy

autor

Mikielewicz D.

autor

Wajs J.

autor

Gliński M.

autor

Zrooga A.

• Gdańsk University of Technology, Faculty of Mechanical Engineering, Narutowicza 11/12, 80-952 Gdańsk, Poland,

Bibliografia

• [1] SEDLER B. and MIKIELEWICZ J.: A simplified model of the boiling crisis, Int. J. Heat Mass Transfer, Vol. 24, 1981, 431-438,.
• [2] WHALLEY P.B., HUTCHINSON P. and HEWITT G.F.: The calculation of critical heat flux in forced convection boiling, Paper B6.11, 5th Int. Heat Transfer Conf., Tokyo, Japan, 1974.
• [3] OKAWA T., KOTANI A., KATAOKA I. and NAITO M.: Prediction of critical heat flux in annular flow using a film flow model, J., Nucl. Science and Technology, Vol. 40, No. 6, 2003, 388-396.
• [4] QU W., MUDAWAR I.: Flow boiling heat transfer in two-phase micro channel heat sinks - II. Annular two-phase flow model, Int. J. Heat and Mass Transfer, Vol. 46, 2003, 2772-2784.
• [5] KANDLIKAR S.: Critical heat flux in subcooled flow boiling - an assessment of current understanding and future directions for research, Multiphase Science and Technology, Vol. 13, 2001, No. 3, 207-232.
• [6] CELATA G.P., CUMO M., KATTO Y. and MARIANI A.: Prediction of the critical heat flux in water subcooled flow boiling using a new mechanistic model, Int. J. Heat and Mass Transfer, Vol. 42, 1999, 1457-1466.
• [7] CELATA G.P.: Modelling of critical heat flux in subcooled flow boiling, Keynote lecture, Convective Flow and Pool Boiling Conference, Irsee, 33-44, 1997.
• [8] OKAWA T., KOTANI A., KATAOKA I. and NAITO M.: Prediction of the critical heat flux in annular regime in various vertical channels, Nucl. Engng and Design, Vol. 229, 2004, 223-236.
• [9] CELATA G.P., MICHIMA K. and ZUMMO G.: Critical heat flux prediction for saturated flow boiling of water in vertical tubes, Int. J. Heat and Mass Transfer, Vol. 44, 2001, 4323-4331.
• [10] CUMO M., MACIUCA C, MORONESI M. and PALAZI G.: A burn-out correlation to scale water with Freon, European Two-Phase Flow Group Meeting, Harwell 1974.
• [11] OKAWA T., KITAHARA T., YOSHIDA K., MATSUMOTO T. and KATAOKA I.: New entrainment rate correlation in annular two-phase flow applicable to wide range of flow conditions, Int. J. Heat and Mass Transfer, Vol. 45, 2002, 87-98.
• [12] KATTO Y. and OHNO H.: An improved version of the generalised correlation of critical heat flux for the forced convective boiling in uniformly heated vertical tubes, Int. J. of Heat and Mass Transfer, Vol. 27, 1984, 1641-1648.
• [13] MIKIELEWICZ D., WAJS J. and GLIŃSKI M.: Modelling of dryout process in annular flow with focus on entrainment, XXVI Nat. Heat Transfer Conf., Palermo 2008.