Natural circulation in two-phase thermosyphon loop heated from below

• Autorzy: Bieliński H. , Mikielewicz J.
• Języki publikacji: EN

Abstrakty

EN

Closed thermosyphon loops are devices capable of transporting heat through natural convection process. This paper focuses on the steady-state behaviour of two-phase natural circulation loops i.e. thermosyphon loops, in which the density difference of fluid between its liquid and vapour phases is a driving force. The steady-state, one-dimensional model is proposed for two-phase thermosyphon. The presented model based on mass, momentum, and energy balances in the evaporator, rising tube, condenser, and the falling tube. The slip two-phase flow model is used in circulations. The effect of the loop.s aspect ratio (height H to the breadth B) on the mass flow rate at the steady-state is examined numerically. Results show that the mass flow rate increases with increasing aspect ratio H/B. Freon R-11 was chosen as a working fluid in the thermosyphon device.

Słowa kluczowe

EN

natural circulation; thermosyphon loop; two-phase flow

• Wydawca: Wydawnictwo Instytutu Maszyn Przepływowych PAN ; Komitet Termodynamiki i Spalania PAN
• Czasopismo: Archives of Thermodynamics
• Rocznik: 2004
• Tom: Vol. 25, no. 3
• Strony: 15--26
• Opis fizyczny: Bibliogr 14. poz.

Twórcy

autor

Bieliński H.

• The Szewalski Institute of Fluid-Flow Machinery, Polish Academy of Sciences

autor

Mikielewicz J.

• The Szewalski Institute of Fluid-Flow Machinery, Polish Academy of Sciences

Bibliografia

• [1] BILICKI Z.: Methods for calculation of pressure drop and coefficients of heat transfer of the boiling flow, readjustment to analysis of the heat exchanger working with freon 22 TBulletin of IFFM, 112/969/81, Gdańsk 1981 (in Polish).
• [2] BIELIŃSKI H., MIKIELEWICZ J.: New solutions of thermal diode with natural laminar circulation, Archives of Thermodynamics, Vol. 22, 2001, 89-106,
• [3] BIELIŃSKI H., MIKIELEWICZ J.: Natural Thermodynamics, Vol. 16, 1995, 3-4. convection of thermal diode, Archives of
• [4] BLOCK J. A.: Emergency cooling water delivery to the core inlet of PWRs during LOCA, Creare TM-529, 1976.
• [5] FERNANDEZ R. T., SURSOCK J. P., KIANG R. L.: Reflux boiling heat removal in a sealed TMI-2 system test facility, ANS/ENS Thermal Reactor Safety Meeting, Tennessee 1980.
• [6] Gogół W.: Heat Transfer. Tables and Graphs, Warszawa 1976 (in Polish).
• [7] Jaspike D.: Advances in thermosyphon technology, Advances in Heat Transfer, Vol. 97, 1981, 369-386.
• [8] MADEJSKI J., MIKIELEWICZ J.: Liquid fin a new device for heat transfer equipment Int. J. Heat Mass Transfer, Vol. 14, 1971, 357-363.
• [9] MCKEE H. R.: Thermosyphon reboilers - a review, Ind. Engng. Chem., Vol. 1970, 76-82.
• [10] MERTOL A., GREIF R.: A review of natural circulation loops, [in: Natural Convec tion: Fundamentals and Applications, S. Kakac, W. Aung, and R. Viskanta eds., Hemisphere, New York 1985, 1033-1071.
• [11] MIKIELEWICZ J.: Modelling of the heat-flow processes, Ossolineum, Fluid-Flow Ma chines Series, Vol. 17, 1995 (in Polish).
• [12] ORZECHOWSKI Z.: Two Phase Flows, One-Dimensional, Steady State, Adiabatic, PWN, Warszawa 1990 (in Polish).
• [13] TRELA M.: A new approach to prediction pressure drop in two-phase flows, Trans actions of IFFM, No. 64, 1974, 38-57.
• [14] WALLIS B. W.: One-Dimensional Two-phase Flow, McGraw Hill, New York 1969.