Buradasınız

Anasayfa » Content

KAPALI TERMOSİFON DÖNGÜSÜNDE AKIŞ VE ISI TRANSFERİ ÜZERİNE PARAMETRİK ÇALIŞMA

A PARAMETRIC STUDY OF FLOW AND HEAT TRANSFER IN CLOSED THERMOSYPHON LOOP

Journal Name:

  • Pamukkale Üniversitesi Mühendislik Bilimleri Dergisi

Publication Year:

  • 2004

Key Words:

Keywords (Original Language):

Author NameUniversity of AuthorFaculty of Author
Abstract (2. Language): 
In this study, closed loop rectangular thermosyphon was studied parametrically. Two-dimensional numerical model was solved using uniform surface temperature boundary condition in the vertical heated and cooled sections of the thermosyphon loop. In two-dimensional model, results for laminar flow case were obtained by solving the momentum and the energy equations through the SIMPLEX Algorithm. Used parameters are Prandtl numbers, Grashof numbers and H/D which is obtained from the elevation difference between the mid-point of heated and cooled sections divided by inside diameter of the thermosyphon pipe. In addition, a correlation for the Nusselt number of the thermosyphon loop was developed. The dependence of this correlation on Grashof and Prandtl numbers was determined.
Bookmark/Search this post with
Abstract (Original Language): 
Bu çalışmada, dikdörtgen formdaki kapalı döngü bir termosifon üzerine, parametrik bir çalışma gerçekleştirilmiştir. Termosifon döngünün düşeyde olan ısıtma ve soğutma bölgelerinde, sabit yüzey sıcaklığı sınır koşulu kullanılarak; iki-boyutlu sayısal çözümleme yapılmıştır. Sayısal sonuçlar, laminer akış kabulü ile ve süreklilik, momentum ve enerji denklemlerinin SIMPLEX algoritması ile çözümlenmesiyle elde edilmiştir. Kullanılan parametreler, Prandtl sayısı, Grashof sayısı ve ısıtma ile soğutma bölgelerinin orta noktaları arasındaki yükseklik farkının boru iç çapına bölünmesiyle elde edilen H/D'dir. Ayrıca, bir termosifon döngüsü için Nusselt sayısı tanımlanmış ve aktarılan ısının Grashof ve Prandtl sayılarına bağlı olarak değişimini veren bir bağıntı geliştirilmiştir.
FULL TEXT (PDF): 
PDF icon arastirmax-kapali-termosifon-dongusunde-akis-isi-transferi-uzerine-parametrik-calisma.pdf
  • 1
127
135
  • Turkish

REFERENCES

References: 

Başaran, T. 2002. Kapalı Termosifon Döngüsünde Akış ve Isı Transferinin Teorik ve Deneysel İncelenmesi. 201 s. Doktora Tezi, Dokuz Eylül Üniversitesi, İzmir.
Bernier, M. A. 1991. Investigation of a Closed-Loop Thermosyphon. 316 s. Ph.D. Thesis, McGill University, Montreal, Canada.
Bernier, M. A. and Baliga, B. R. 1992. A 1-D/2-D Model and Experimental Results For a Closed Loop Thermosyphon With Vertical Heat Transfer Sections. Int. J. Heat Mass Transfer, 35(11), 2969¬2982.
Chen, K. 1985. The Optimum Configuration of Natural Convection Loops. Solar Energy, 34 (4/5),
407-416.
Creveling, H. F., Paz, J. F., Baladi, J. Y. and Schoenhals, R. J. 1975. Stability Characteristics of a Single-Phase Free Convection Loop. J. Fluid Mech., 67(1), 65-84.
Damerell, P. S. and Schoenhals, R. J. 1979. Flow in a Toroidal Thermosyphon With Angular Displacement of Heated and Cooled Sections. Journal of Heat Transfer, 101, 672-676.
Greif, R. 1988. Natural Circulation Loops. Journal of Heat Transfer, 110, 1243-1258.
Hallinan, K. P. and Viskanta, R. 1986. Dynamics of a Natural Circulation Loop: Analysis and Experiments. Heat Transfer Engineering, 7(3-4), 43¬52.
Huang, B. J. and Zelaya, R. 1988. Heat Transfer Behavior of a Rectangular Thermosyphon Loop. Journal of Heat Transfer, 110, 487-493.
Incropera, F. P. and DeWitt, D. P. 1996.
Introduction to Heat Transfer (3. baskı). John Wiley & Sons, New York.
Lavine, S. A., Greif, R. and Humprey J. A. C. 1986. Three-Dimensional Analysis of Natural Convection İn A Toroidal Loop-Effect of Tilt Angle. Journal of
Heat Transfer, 108, 796-805.
Mühendislik Bilimleri Dergisi 2004 10 (1) 127-135
134
Journal of Engineering Sciences 2004 10 (1) 127-135
Kapali Termosifon Döngüsünde Akış ve Isı Transferi Üzerine Parametrik Çalışma, T. Başaran, S.Küçüka
Lavine, S. A., Greif, R. and Humprey J. A. C. 1987. A Three-Dimensional Analysis of Natural Convection İn A Toroidal Loop-The Effect of Grashof Number. Int. J. Heat Mass Transfer, 30(2),
251-262.
Mertol, A., Place, W., Webster, T. and Greif, R. 1981a. Detailed Loop Model (DLM) Analysis of Liquid Solar Thermosiphons With Heat Exchangers. Solar Energy, 27 (5), 367-386.
Mertol, A., Greif, R. Ve Zvirin, Y. 1981b. The Transient, Steady State and Stability Behavior of A Thermosyphon With Throughflow. Int. J. Heat Mass
Transfer, 24(4), 621-633.
Mertol, A. and Greif, R. 1985. In Natural Convection Fundamentals and Applications. Washington: Hemisphere. S. Kakaç, W. Aung ve R. Viskanta (Eds). A Review of Natural Circulation
Loops. 1033-1071.
Patankar, S. V. 1980. Numerical Heat Transfer and Fluid Flow. 197 S. Mcgraw-Hill Book Company, New York.
Raithby, G. D. ve Schneider, G. E. 1988. Handbook of Numerical Heat Transfer. New York. John Wiley & Sons. W. J. Minkowycz, E. M. Sparrow, G. E.
Schneider and R. H. Pletcher (Eds). Elliptic Systems.
Stern, C. H., Greif, R. and Humphrey, J. A. C. 1988. An Experimental Study of Natural Convection in A Toroidal Loop. Journal of Heat Transfer, 110, 877¬884.
Su,
Y
. and Chen, Z. 1995. 2-D Numerical Study on A Rectangular Thermosyphon With Vertical Or Horizantal Heat Transfer Sections. Int. J. Heat Mass
Transfer, 38, 3313-3317.
Welander, P. 1967. On the Oscillatory İnstability of A Differentially Heated Fluid Loop. J. Fluid Mech., 29 (1), 17-30.
Zvirin, Y. 1981. A Review of Natural Circulation Loops İn Pressurized Water Reactors and Other Systems. Nuclear Engineering And Design, 67,
203-225.
Zvirin, Y., Jeuck, P. R., Sullivan, C. W. and Duffey, R. B. 1981. Experimental And Analytical İnvestigation of A Natural Circulation System With Parallel Loops. Journal of Heat Transfer, 103, 645¬652.

Thank you for copying data from http://www.arastirmax.com