| NUCLEAR AND NEW ENERGY TECHNOLOGY |
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Effect of non-condensable gases on steam condensation in a vertical pipe with forced convection |
| MA Xizhen, JIA Haijun, LIU Yang |
| Key Laboratory of Advanced Reactor Engineering and Safety of Ministry of Education, Collaborative Innovation Center of Advanced Nuclear Energy Technology, Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China |
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Abstract Non-condensable gases have an important influence on steam condensation by increasing the thermal resistance during condensation and decreasing the heat transfer coefficient. A heat and mass analogy model based on the Nusselt's theory is developed for steam condensation in a vertical pipe with forced convection. The predicted effects of the non-condensable gases on the condensation are with agreement with experimental data. The heat transfer coefficient in the inlet varies from 4.8 kW/(m2·K) to 1.2 kW/(m2·K) for inlet air mass fractions from 8.73% to 22.45%. The heat transfer coefficient then decreases along the pipe. Increasing the inlet temperature from 100 ℃ to 140 ℃ reduces the inlet heat transfer coefficient. The research shows that the inlet temperature and the kind and the mass fraction of non-condensable gas are the important factors governing steam condensation rate.
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| Keywords
non-condensable gas
condensation
heat and mass transfer
forced convection
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Issue Date: 15 May 2017
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| [1] |
Othmer D F. The condensation of steam [J]. Industrial & Engineering Chemistry, 1929, 21(6): 576-583.
url: http://dx.doi.org/trial
|
| [2] |
Al-Diwany H K, Rose J W. Free convection film condensation of steam in the presence of non-condensing gases [J]. International Journal of Heat and Mass Transfer, 1973, 16(7): 1359-1369.
|
| [3] |
Rose J W. Condensation of a vapour in the presence of a non-condensing gas [J]. International Journal of Heat and Mass Transfer, 1969, 12(2): 233-237.
|
| [4] |
Minkowycz W J, Sparrow E M. Condensation heat transfer in the presence of noncondensables, interfacial resistance, superheating, variable properties, and diffusion [J]. International Journal of Heat and Mass Transfer, 1966, 9(10): 1125-1144.
|
| [5] |
Huhtiniemi I K, Corradini M L. Condensation in the presence of noncondensable gases [J]. Nuclear Engineering and Design, 1993, 141(3): 429-446.
|
| [6] |
Oh S, Revankar S T. Experimental and theoretical investigation of film condensation with noncondensable gas [J]. International Journal of Heat and Mass Transfer, 2006, 49(15): 2523-2534.
|
| [7] |
Dehbi A A. The Effects of Noncondensable Gases on Steam Condensation under Turbulent Natural Convection Conditions [D]. Cambridge, MA, USA: Massachusetts Institute of Technology, 1991.
|
| [8] |
Lee K Y, Kim M H. Effect of an interfacial shear stress on steam condensation in the presence of a noncondensable gas in a vertical tube [J]. International Journal of Heat and Mass Transfer, 2008, 51(21): 5333-5343.
|
| [9] |
Maheshwari N K, Saha D, Sinha R K. Investigation on condensation in presence of a noncondensable gas for a wide range of Reynolds number [J]. Nuclear Engineering and Design, 2004, 227(2): 219-238.
|
| [10] |
MacAdams W H. Heat Transmission [M]. New York: McGraw-Hill, 1954.
|
| [11] |
Siddique M. The Effects of Noncondensable Gases on Steam Condensation under Forced Convection Conditions [D]. Cambridge, MA, USA: Massachusetts Institute of Technology, 1992.
|
| [12] |
Bird R B. Transport phenomena [J]. Applied Mechanics Reviews, 2002, 55(1): R1-R4.
|
| [13] |
Nithianandan C K, Morgan C D, Shah N H, et al. RELAP5/MOD2 model for surface condensation in the presence of noncondensable gases [C]//Proc 8th Int Heat Transfer Conf. Washington DC, USA: Hemisphere Publishing, 1986, 4: 1627-1633.
|
| [14] |
Kays W M, Moffat R J. The Behavior of Transpired Turbulent Boundary Layers [R]. NASA STI/Recon Technical Report N, 1975, 75, 32383.
|
| [15] |
Uchida H, Oyama A, Togo Y. Evaluation of Post-Incident Cooling Systems of Light Water Power Reactors: No.A/CONF.28/P/436 [R]. Tokyo: Tokyo University, 1964.
|
| [16] |
Akaki H, Kataoka Y, Murase M. Measurement of condensation heat transfer coefficient inside a vertical tube in the presence of noncondensable gas [J]. Journal of Nuclear Science and Technology, 1995, 32(6): 517-526.
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2017,
Vol. 57
