ANALYSIS OF THE TWO PHASE FLOW PRESSURE DROP TYPE OSCILLATIONS IN A WATER BOILING HORIZONTAL STRAIGHT TUBE

Yıl 2018, , 324 - 334, 31.01.2018

Şendoğan Karagöz Mehmet Yılmaz Gökhan Ömeroğlu

https://doi.org/10.28948/ngumuh.387071

Öz

   Two phase
flows occur in many industrial applications such as refrigeration systems,
turbo machinery, and power plant heat exchangers. Prediction of flow parameters
is very crucial in design of two-phase flow equipment. Oscillations incurred by
instabilities in two-phase flow systems cause mechanical vibrations, boiling
crisis, high transient temperatures, control problems and even burnout at wall
surface. This study is focused on determining steady state characteristic
curves for certain inlet temperature and exit restriction conditions at
different mass flow rates and compares variation of pressure drop type dynamic
two phase flow instabilities in horizontal tube system. This work aims to
predict low frequency pressure drop type oscillations in an in-tube boiling
system. Results provide further understanding of mechanism of
pressure-drop-type instabilities in a horizontal boiling tube system. They can
also be utilized as guidance for design and control strategy of systems to
avoid serious oscillation problems. 

Anahtar Kelimeler

Two phase flow instabilities, pressure drop type instabilities, density wave type instabilities, stability boundary, inlet sub-cooling

SU KAYNAMALI YATAY DÜZ BORUDA İKİ FAZLI AKIŞ BASINÇ DÜŞÜMÜ OSİLASYONLARININ ANALİZİ

Öz

   İki fazlı akışlar, soğutma sistemleri, turbo makineler ve enerji
santrallerindeki ısı eşanjörleri gibi birçok endüstriyel uygulamada ortaya
çıkar. İki fazlı akış ekipmanlarının tasarımında akış parametrelerinin tahmini
çok önemlidir. İki fazlı akış sistemlerinde kararsızlıklardan kaynaklanan
salınımlar mekanik titreşimlere, kaynama krizine, yüksek geçiş sıcaklıklarına,
kontrol problemlerine ve hatta cidarda ani sıcaklık yükselmesine neden olur. Bu
çalışma, belirli giriş sıcaklığı ve çıkış kısıtlaması şartlarında değişik
debilerde kararlı hal karakteristik eğrilerini belirleme üzerine odaklanmıştır
ve yatay borulu sistemdeki basınç düşümü tipi iki fazlı akış dinamik
kararsızlıklarının değişimlerini karşılaştırmaktadır. Bu çalışma, borulu
kaynama sisteminde düşük frekanslı salınımları öngörmeyi amaçlamaktadır.
Sonuçlar, yatay kaynamalı boru sisteminde basınç düşümü tipi kararsızlık
mekanizmasının daha iyi anlaşılmasını sağlar. Ayrıca, ciddi salınım
problemlerinden kaçınmak için sistemlerin tasarım ve kontrol stratejileri için
kılavuz olarak da kullanılabilirler.

Anahtar Kelimeler

İki fazlı akım istikrarsızlıkları, basınç düşüşü tipi istikrarsızlıklar, yoğunluk dalga tipi istikrarsızlıklar, stabilite sınırı, giriş aşırı soğutma

Kaynakça

• [1] HETSRONI, G., Handbook of Multiphase Flow, Hemisphere Publishing Corp., Washington DC, 2, 95-136, 1982.
• [2] TONG, I. S., TANG, Y. S., Boiling Heat Transfer and Two Phase Flow. Taylor and Francis, Washington DC, 477-480, 1997.
• [3] HETSRONI, G., MOSYAK, A., SEGAL, Z., “Two Phase Flow in Micro Channels”, Proc. 2001 ASME IMECE, Paper No. HTD-24216i New York, 11-16 November, 2001.
• [4] BABELLI, I., ISHII, M., “Flow Excursion Instability in Downward Flow System: Part II Two Phase Instability”, Nuclear Engr. Design., 206, 97-104, 2001.
• [5] KAKAC, S.A., “Review of Two Phase Flow Instabilities”, Int’l J Multiphase Flow, 22, l-67, 1994.
• [6] BOURÉ, J.A., BERGLES, A.E., TONG, L.S., Review of Two-Phase Flow Instability. Nuclear Engineering & Design, vol. 25. North-Holland Publishing Company, pp. 165–192, 1973.
• [7] OMEROGLU, G., ÇOMAKLI, O., KARAGOZ, S., KARSLI, S., “Comparison of the Effects of Different Insertion Types on Two Phase Flow Instabilities Journal of Enhanced Heat Transfer”, DOI: 10.1615/JEnhHeatTransf.2013007708, 20(2), 179-194, 2013.
• [8] OMEROGLU, G., ÇOMAKLI, O., KARAGOZ, S., SAHIN, B., “Experimental Research of Dynamic Instabilities in the Presence of Coiled Wire Inserts on Two-Phase Flow”, The Scientific World Journal, Article ID:714180/doi:10.155/2013/714180, 2013.
• [9] COMAKLI, O., KARSLI, S., YILMAZ, M., “Experimental Investigation of Two Phase Flow Instabilities in a Horizontal in-Tube Boiling System”, Energy Conversion and Management, 43 249-268, 2002.
• [10] COMAKLI, O., YILMAZ, M., OZYURT, O., KARSLI, S., “Two-Phase Flow Thermal Instabilities in a Horizontal in-Tube Boiling System with Enhanced Surfaces”, Experimental Heat Transfer, 17, 199-226, 2004.
• [11] FRANGA, F., LAHEY, R.T., “The Use of Drift Flux Techniques for the Analysis of Horizontal Two Phase Flows”, Int’l J Multiphase Flow, 18, 787-801, 1992.
• [12] DING, Y., Experimental investigation of two phase flow phenomena in horizontal convective in-tube boiling system. PhD Thesis, University of Miami USA, 21-65, 1993.
• [13] WIDMANN, F., COMAKLI, O., GAVRILESCU, C.O., KAKAC, S., “The Effect of Inlet Subcooling on Two Phase Flow Instabilities in a Horizontal in-Tube Flow Boiling System”, 3. Int Symp on Multiphase Flow and Heat Transfer, Xi'an, China, 19-21, 1994.
• [14] WIDMANN, F., COMAKLI, O., GAVRILESCU, C.O., DING Y., KAKAC, S., “The Effect of Augmented Surfaces on Two Phase Flow Instabilities in a Horizontal System”, J. Enh. Heat. Transf., 2(4), 263-71, 1995.
• [15] KAKAC, S., GAVRILESCU, C.O., COMAKLI, O., “Two Phase Flow Instabilities with Augmented Surfaces in a Horizontal in Boiling System”, Tenth Turkish National Conference on Thermal Sciences and Technologies, Ankara, 1-26, 1995.
• [16] LIN, Z.H., ZHANG, X., CHEN, X. J., VEZIROGLU, T.N., KAKAC, S., “An Analytical Study of the Pressure Drop Type Instabilities in a Horizontal Hairpin Tube”, International Journal of Engineering Fluid Mechanics, 4, 427-434, 1988.
• [17] RUDER, Z., HANRATTY, T.J., “A definition of Gas Liquid Plug Flow in Horizontal Pipes”, International Journal of Multiphase Flow, 16, 233-242, 1990.
• [18] KARAGOZ, S., KARSLI, S., YILMAZ, M., COMAKLI, O., “Density-Wave Flow Oscillations in a Water Boiling Horizontal Tube with Inserts”, Journal of Enhanced Heat Transfer, 16, 331-350, 2009.
• [19] LIU, H.T.; KAKAC, S., “An Experimental Investigation of Thermally Induced Flow Instabilities in a Convective Boiling Upflow System”, Heat and Mass Transfer, 26(6), 365-376, 1991.
• [20] DING, Y., SCHOLZ, F., SHEN, R.H., KAKAC, S., “Two Phase Flow Instabilities in a horizontal in Tube Boiling System”, The Sixth Int. Symp. Transport Phenomena Thermal Engineering, Seoul, Korea, 221-33, 1993.
• [21] ÇOMAKLI, Ö., KARSLI, S.; YILMAZ, M,.” Experimental Investigation of Two Phase Flow Instabilities in a Horizontal in-Tube Boiling System”, Energy Conversion and Management, 43(2), 249-268, 2002.
• [22] LIANG, N., SHOANGQUAN, S., TIAN C., YAN, Y.Y., “Two-Phase Flow Instabilities in Horizontal Straight Tube Evaporator”, Applied Thermal Engineering, 31, 181-187, 2011.
• [23] KAKAC, S., CAO, L., “Analysis of Convective Two Phase Flow Instabilities in Vertical and Horizontal Systems”, Int’l J. Heat & Mass Trans., 52, 3984-3993, 2009.
• [24] OMEROGLU, G., Investigation of the Effects of Turbulators on Two-Phase Flow Instabilities. PhD Thesis. Ataturk University, Erzurum / TR, 2012.