Experimental Observations of Boiling and Flow Evolution in a Coiled Tube

P. Ye; X. F. Peng; H. L. Wu; M. Meng; Y. Eric Gong

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자료유형: 학술저널

저자정보: P. Ye X. F. Peng H. L. Wu M. Meng Y. Eric Gong

저널정보: 대한설비공학회 International Journal of Air-Conditioning and Refrigeration International Journal of Air-Conditioning and Refrigeration Vol.16 No.1

발행연도: 2008.3

수록면: 22 - 29 (8page)

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A sequence of visually experimental observations was conducted to investigate the flow boiling and two-phase flow in a coiled tube. Different boiling modes and bubble dynamical evolutions were identified for better recognizing the phenomena and understanding the two-phase flow evolution and heat transfer mechanisms. The dissolved gases and remained vapor would serve as foreign nucleation sites, and together with the effect of buoyancy, centrifugal force and liquid flow, these also induce very different flow boiling nucleation, boiling modes, bubble dynamical behavior, and further the boiling heat transfer performance.
Bubbly flow, plug flow, slug flow, stratified/wavy flow and annular flow were observed during the boiling process in the coiled tube. Particularly the effects of flow reconstructing and thermal non-equilibrium release in the bends were noted and discussed with the physical understanding. Coupled with the effects of the buoyancy, centrifugal force and inertia or momentum ratio of the two fluids, the flow reconstructing and thermal non-equilibrium release effects have critical importance for flow pattern in the bends and flow evolution in next straight sections.

#Coiled tube #Tube bend #Flow boiling #Visual observation #Bubble dynamics #Interface

참고문헌 (17)

참고문헌 신청

J.G. Collier / 1994 / Convective Boiling and Condensation, 3rd Edition / Oxford University Press

N. Kattan / 1998 / Flow boiling in horizontal tubes: part 1-development of a diabatic two-phase flow pattern map / Journal of Heat Transfer 120:140~147

L. Wojtan / 2005 / Investigation of flow boiling in horizontal tubes Part I—A new diabatic two-phase flow pattern map / International Journal of Heat and Mass Transfer 48:2955~2969

L.X. Cheng / 2006 / New flow boiling heat transfer model and flow pattern map for carbon dioxide evaporat ing inside horizontal tubes / International Journal of Heat and Mass Transfer 49:4082~4094

S.G. Kandlikar / 1989 / Multipass Plate Heat Exchangers-Effectiveness-NTU Results and Guidelines for Selecting Pass Arrangements / Journal of Heat Transfer 111:300~313

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