环形通道内液态铅铋合金流动换热特性实验研究
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摘要
通过对环形通道内液态铅铋合金的流动换热特性进行实验研究,得到了气泡泵注气对液态金属流动的影响,并拟合出环形通道内液态铅铋合金的摩擦系数关系式和换热特性关系式。结果表明:采用气泡泵注气能有效提升铅铋合金的质量流速;相同Reynolds数下环形通道内液态铅铋合金的摩擦系数大于由布拉休斯公式计算得到的摩擦系数;液态铅铋合金对流换热过程中,导热项占主导地位,并且Nusselt数随Peclet数的增大而增大。
Through the experimental study on flow and heat transfer characteristic of liquid lead-bismuth eutectic(LBE) in an annular channel, the influence of gas-injection by gas-lift pump on flow of liquid LBE was obtained and the experimental correlations of friction coefficient and convection heat transfer of liquid LBE were fitted. The results show that gas-injection can significantly increase liquid LBE mass flow rate. The friction coefficient of liquid LBE in annular channel is larger than that calculated by Blasius formula at the same Reynolds number. For the convection heat transfer of liquid LBE, heat conduction in liquid LBE is dominant, and Nusselt number increases with Peclet number.
Through the experimental study on flow and heat transfer characteristic of liquid lead-bismuth eutectic(LBE) in an annular channel, the influence of gas-injection by gas-lift pump on flow of liquid LBE was obtained and the experimental correlations of friction coefficient and convection heat transfer of liquid LBE were fitted. The results show that gas-injection can significantly increase liquid LBE mass flow rate. The friction coefficient of liquid LBE in annular channel is larger than that calculated by Blasius formula at the same Reynolds number. For the convection heat transfer of liquid LBE, heat conduction in liquid LBE is dominant, and Nusselt number increases with Peclet number.
引文
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[3] BENAMATI G,FOLETTI C,FORGIONE N,et al.Experimental study on gas-injection enhanced circulation performed with the CIRCE facility[J].Nuclear Engineering and Design,2007,237(7):768-777.
[4] TARANTINO M,BERNARDI D,COCCOLUTO G,et al.Natural and gas enhanced circulation tests in the NACIE heavy liquid metal loop[C]//International Conference on Nuclear Engineering.[S.l.]:[s.n.],2010:933-942.
[5] SUZUKI T,TOBITA Y,KONDO S,et al.Analysis of gas-liquid metal two-phase flows using a reactor safety analysis code SIMMER-Ⅲ[J].Nuclear Engineering and Design,2003,220(3):207-223.
[6] SAITO Y,MISHIMA K,TOBITA Y,et al.Velocity field measurement in gas-liquid metal two-phase flow with use of PIV and neutron radiography techniques[J].Applied Radiation and Isotopes,2004,61(4):683-691.
[7] SAITO Y,MISHIMA K,TOBITA Y,et al.Application of high frame-rate neutron radiography to liquid-metal two-phase flow research[J].Nuclear Instruments and Methods in Physics Research,2005,542(1):168-174.
[8] AMBROSINI W,FORASASSI G,FORGIONE N,et al.Experimental study on combined natural and gas-injection enhanced circulation[J].Nuclear Engineering and Design,2005,235(10-12):1 179-1 188.
[9] 仇子铖,秋穗正,巫英伟,等.环形通道内液态金属钠流动换热特性实验研究[J].原子能科学技术,2015,49(5):795-800.QIU Zicheng,QIU Suizheng,WU Yingwei,et al.Experimental research on heat transfer characteristic of liquid sodium flowing in annulus[J].Atomic Energy Science and Technology,2015,49(5):795-800(in Chinese).
[10] TALER D.Heat transfer in turbulent tube flow of liquid metals[J].Procedia Engineering,2016,157:148-157.
[11] PACIO J,MAROCCO L,WETZEL T.Review of data and correlations for turbulent forced convective heat transfer of liquid metals in pipes[J].Heat and Mass Transfer,2015,51(2):153-164.
[12] JAEGER W.Heat transfer to liquid metals with empirical models for turbulent forced convection in various geometries[J].Nuclear Engineering and Design,2017,319:12-27.
[13] Handbook on lead-bismuth eutectic alloy and lead properties,materials compatibility,thermal-hydraulics and technologies[R].[S.l.]:Organisation for Economic Cooperation and Development,Nuclear Energy Agency,2007.
[14] MOFFAT R J.Describing the uncertainties in experimental results[J].Experimental Thermal and Fluid Science,1988,1(1):3-17.
[15] KASSAB S Z,KANDIL H A,WARDA H A,et al.Air-lift pumps characteristics under two-phase flow conditions[J].International Journal of Heat and Fluid Flow,2009,30(1):88-98.