Minikanallarda Doymuş Kaynamalı Akış Karakteristiklerinin Deneysel İncelenmesi
Bu deneysel çalışmada, 1,2 mm hidrolik çapa sahip (kanal genişliği: 1,8 mm, kanal yüksekliği: 0,9 mm) tek dikdörtgensel kesitli bir minikanalda doymuş kaynamalı akış karakteristikleri incelenmiştir. İş akışkanı olarak deiyonize su kullanılmıştır. Akışkan giriş sıcaklığı 86 ± 2 °C’de sabit tutularak farklı kütle akısı (100, 200 ve 300 kg/m2s) ve ısıl güç (89,8; 119,8; 149,9; 179,9 ve 210,1 W) değerlerinde çalışılmıştır. Kütle akısı, ısı akısı ve kuruluk derecesinin yerel iki faz ısı transfer katsayısı ve toplam basınç düşümü üzerindeki etkileri incelenmiştir. Yüksek hızlı kamera aracılığıyla akış görüntüleri elde edilmiş ve fiziksel mekanizma analiz edilmiştir. Genel karakter olarak, iki faz ısı transfer katsayısının artan ısı akısı, kuruluk derecesi ve kütle akısı ile arttığı; benzer şekilde, toplam basınç düşümünün de artan ısı akısı, çıkış kuruluk derecesi ve kütle akısı ile arttığı belirlenmiştir.
An Experimental Investigation of Saturated Flow Boiling Characteristics in Minichannels
In this experimental study, saturated flow boiling characteristics are investigated in a single rectangular minichannel with hydraulic diameter of 1,2 mm (channel width: 1,8 mm, channel height: 0,9 mm). Deionized water is used as the working fluid. Inlet temperature of the fluid is kept constant at 86 ± 2 °C, while experiments are conducted under different mass fluxes (100, 200 ve 300 kg/m2s) and heating powers (89,8; 119,8; 149,9; 179,9 ve 210,1 W). The effects of the mass flux, heat flux and vapor quality on the local two phase heat transfer coefficient and total pressure drop are investigated. Flow images are obtained via high speed camera, and the physical mechanism is analyzed. It is concluded that, in general manner, two phase heat transfer coefficient increases with increasing heat flux, vapor quality and mass flux, and similarly, total pressure drop increases with increasing heat flux, exit vapor quality and mass flux.
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KAYNAKLAR Tran, T. N., Wambsganss, M. W., France, D. M., “Small Circular and Rectangular Channel Boiling With Two Refrigerants”, International Journal of Multiphase Flow, 22, 485-498, 1996. Lee, H. J., Lee, S. Y., “Heat Transfer Correlation For Boiling Flows in Small Rectangular Horizontal Channels With Low Aspect Ratios”, International Journal of Multiphase Flow, 27, 2043-2062, 2001. Yu, W., France, D. M., Wambsganss, M. W., Hull, J. R., “Two-Phase Pressure Drop, Boiling Heat Transfer, and Critical Heat Flux to Water in A Small-Diameter Horizontal Tube”, International Journal of Multiphase Flow, 28, 927-941, 2002. Huai, X., Koyama, S., Zhao, T. S., Shinmura, E., Hidehiko, K., Masaki, M., “An Experimental Study of Flow Boiling Characteristics of Carbon Dioxide in Multiport Mini Channels”, Applied Thermal Engineering, 24, 1443-1463, 2004. Huo, X., Chen, L., Tian, Y. S., Karayiannis, T.g., “Flow Boiling and Flow Regimes in Small Diameter Tubes”, Applied Thermal Engineering, 24, 1225-1239, 2004. Saitoh, S., Daiguji, H., Hihara, E., “Effect of Tube Diameter On Boiling Heat Transfer of R134A in Horizontal Small-Diameter Tubes”, International Journal of Heat and Mass Transfer, 48, 49734984,2005. Balasubramanian, P., Kandlikar, S. G., “Experimental Study of Flow Patterns,Pressure Drop, and Flow Instabilities in Parallel Rectangular Minichannels”, Heat Transfer Engineering, 26, 20-27,2005. Bang, K. H., Kim, K. K., Lee, S. K., Lee, B. W., “Pressure Effect On Flow Boiling Heat Transfer of Water in Minichannels”, International Journal of Thermal Sciences, 50, 280-286, 2011. Kaew-On, J., Sakamatapan, K., Wongwises, S., “Flow Boiling Heat Transfer of R134a in the Multiport Minichannel Heat Exchangers”, Experimental Thermal and Fluid Science, 35, 364-374, 2011. Copetti, J. B., Macagnan, M. H., Zinani, F., Kunsler, N. L. F., “Flow Boiling Heat Transfer and Pressure Drop of R134A in A Mini Tube: An Experimental Investigation”, Experimental Thermal and Fluid Science, 35, 636-644, 2011. Lim, T. W., You, S. S., Choi, J. H., Kim, H. S., “Experimental Investigation of Heat Transfer in Two Phase Flow Boiling”, Experimental Heat Transfer, 28, 23-36, 2015. Keepaiboon, C., Wongwises, S., “Two-Phase Flow Patterns and Heat Transfer Characteristics of R134a Refrigerant During Flow Boiling in A Single Rectangular Micro-Channel”, Experimental Thermal and Fluid Science, 66, 36-45, 2015. Markal, B., Aydin, O., Avci, M., “Effect of Aspect Ratio On Saturated Flow Boiling in Microchannels”, International Journal of Heat and Mass Transfer, 93, 130-143, 2016. Markal, B., Aydin, O., Avci, M., “An Experimental Investigation of Saturated Flow Boiling Heat Transfer and Pressure Drop in Square Microchannels”, International Journal of Refrigeration, 65, 1-11,2016. Markal, B., Mikrokanallarda Kaynamalı Akışın Deneysel Incelenmesi, Doktora Tezi, K.t.ü., Fen Bilimleri Enstitüsü, Trabzon, 2016. Kline, S. J., Mcclintock, F. A., “Describing Uncertainties in Single-Sample Experiments”, Mechanical Engineering, 73, 3-8, 1953. Çengel, Y. A., “Heat and Mass Transfer: A Practical Approach”, 3 Rd Edition, 2006. Muzychka, Y., S.,Yovanovi̇ch, M., M., “Pressure Drop in Laminar Developing Flow in Noncircular Ducts: A Scaling and Modeling Approach”, Journal of Fluids Engineering, 131, 1-11, 2009. Mirmanto, M., “Heat Transfer Coefficient Calculated Using A Linear Pressure Gradient Assumption and Measurement For Flow Boiling in Microchannels”, International Journal of Heat and Mass Transfer, 79, 269-278, 2014. Mahmoud, M. M., Karayiannis, T. G., Kenning, D. B. R., “Flow Boiling Pressure Drop of R134a in Microchannels Tubes: Experimental Results and Assessment of Correlations, Heat Transfer Engineering”, 35, 178-192, 2014. Qu, W., Siu-Ho, A., “Experimental Study of Saturated Flow Boiling Heat Transfer in An Array of Staggered Micro-Pin-Fins”, International Journal of Heat and Mass Transfer, 52, 1853-1863, 2009. Qu, W., Mudawar, I., “Measurement and Prediction of Pressure Drop in Two-Phase Microchannel Heat Sinks”, International Journal of Heat and Mass Transfer, 46, 2737-2753, 2003. Lee, P., Garimella, S. V., “Saturated Flow Boiling Heat Transfer and Pressuredrop in Silicon Microchannel Arrays”, International Journal of Heat and Mass Transfer, 51, 789-806, 2008. Qu, W., Mudawar I., Lee, S. Y., Wereley, S. T., “Experimental and Computational Investigation of Flow Development and Pressure Drop in A Rectangular Microchannel”, Journal of Electronic Packaging, 128, 19, 2006. Collier, J. G., Thome, J. R., “Convectiveboilingandcondensation”, (Third Edition), Usa: Oxford Universitypress, 1994. Blevins, R. D., “Applied Fluid Dynamics Handbooks”, New York: Van Nostrand Reinhold Company, 1984.
- ISSN: 1300-3399
- Yayın Aralığı: Yılda 6 Sayı
- Başlangıç: 1993
- Yayıncı: TMMOB MAKİNA MÜHENDİSLERİ ODASI
Sayıdaki Diğer Makaleler
Isı Borulu Isı Geri Kazanım Ünitelerinin Baca Gazı Uygulamalarında Teorik ve Deneysel İncelemesi
Minikanallarda Doymuş Kaynamalı Akış Karakteristiklerinin Deneysel İncelenmesi
Ayşe CANDAN, Burak MARKAL, Ali Orhan AYDIN, Mete AVCI
Mevcut Bir Binanın Enerji Tüketiminin Azaltılması ve Ekonomik Analizi