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采用RNG k-ε 湍流模型对超临界CO2流体在内径为4 mm, 长度2000 mm, 节距为10 mm, 曲率为0.1的水平螺旋管内的冷却换热进行了数值模拟.研究了质量流量、热流量以及压力对换热系数的影响, 并和超临界CO2在水平直管内的冷却换热进行了对比.研究结果表明, 超临界CO2在水平螺旋管内流动产生的二次流强于水平直管内的二次流, 前者的换热系数大于后者; 换热系数随质量流量的增加而增大; 在似气体区, 换热系数随着热流量的增加而增大, 而在似液体区, 热流量对换热系数几乎没有影响; 换热系数峰值点随着压力的升高而下降, 并向高温区偏移.In the present study, cooling heat transfer of supercritical CO2 in a horizontal helically coiled-tube 4 mm in diameter, 2000 mm in length, a pitch of 10 mm and 0.1 in curvature is numerically investigated with RNG turbulence model. Influences of mass flow rate, heat flux and pressure on heat transfer of supercritical CO2 are studied. The characteristics of the flow and heat transfer are compared with those in a horizontal straight tube. Results show that the secondary flow and heat transfer coefficient in a helically coiled tube is obviously larger than in a horizontal straight tube. The heat transfer coefficient of supercritical CO2 increases with increasing mass flow rate, and the heat transfer coefficient increases slightly as the heat flux increases in the gas-like region, while the heat transfer coefficient is unaffected by heat flux in the liquid-like region. The peak of the heat transfer coefficient decreases and shifts to a higher temperature region as the pressure increases.
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Keywords:
- supercritical CO2 /
- numerical study /
- helically coiled-tube /
- cooling heat transfer
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[3] Luo B Y, Lu Y G 2008 Acta Phys. Sin. 57 4397 (in Chinese) [罗奔毅, 卢毅刚 2008 57 4397]
[4] Liao S M, Zhao T S 2002 J. Heat Transfer 124 413
[5] Bae Y Y, Kim H Y 2009 Exp. Therm Fluid Sci. 33 329
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[7] Bae Y Y, Kim H Y 2011 Int. J. Heat Fluid Flow 32 340
[8] Jiang P X, Zhang Y, Xu Y J, Shi R F 2008 Int. J. Thermal Sci. 47 998
[9] Jiang P X, Zhang Y, Zhao C R, Shi R F 2008 Exp. Therm Fluid Sci. 32 1628
[10] Du Z X, Lin W S, Gu A Z 2010 J. Supercrit. Fluids 55 116
[11] Yang C Y, Xu J L, Wang X D, Zhang W 2013 Int. J. Heat Mass Transfer 64 212
[12] Wang S X, Niu Z Y, Xu J L 2013 J. Chem. Ind. Eng. 64 3917 (in Chinese) [王淑香, 牛志愿, 徐进良 2013 化工学报 64 3917]
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[14] Shao L, Han J T, Pan J H 2007 J. Refrigeration 28 23 (in Chinese) [邵莉, 韩吉田, 潘继红 2007 制冷学报 28 23]
[15] Fu C F, Wei Y Y, Duan Z Y, Wang W X, Duan Y B 2009 Chin.Phys.B 18 2749
[16] Liberto D M, Ciofalo M 2013 Int. J. Heat Mass Transfer 59 112
[17] Lin C X, Ebadian M A 1999 Int. J. Heat Mass Transfer 42 739
[18] Shao L, Han J T 2007 J. Hydrodynamics, Ser. B 19 677
[19] Mao Y F, Guo L J, Bai B F, Zhang X M 2010 Front. Energy Power Eng. China 4 546
[20] Dittus F W, Boelter L M K 1930 Univ. Calif. Publ. Eng. 2 443
[21] Xu X X, Chen G M, Tang L M, Zhu Z J 2011 Int. J. Energy Res. 35 1266
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[1] Wang L L, Ma Y T, Li M X, Gong W J 2009 J. Eng. Thermophys. 30 1811 (in Chinese) [汪琳琳, 马一太, 李敏霞, 龚文谨 2009 工程热 30 1811]
[2] Yan K F, Li X S, Chen Z Y, Xu C G 2010 Acta Phys. Sin. 59 4313 (in Chinese) [颜克凤, 李小森, 陈朝阳, 徐纯钢 2010 59 4313]
[3] Luo B Y, Lu Y G 2008 Acta Phys. Sin. 57 4397 (in Chinese) [罗奔毅, 卢毅刚 2008 57 4397]
[4] Liao S M, Zhao T S 2002 J. Heat Transfer 124 413
[5] Bae Y Y, Kim H Y 2009 Exp. Therm Fluid Sci. 33 329
[6] Bae Y Y, Kim H Y 2010 Exp. Therm Fluid Sci. 34 1295
[7] Bae Y Y, Kim H Y 2011 Int. J. Heat Fluid Flow 32 340
[8] Jiang P X, Zhang Y, Xu Y J, Shi R F 2008 Int. J. Thermal Sci. 47 998
[9] Jiang P X, Zhang Y, Zhao C R, Shi R F 2008 Exp. Therm Fluid Sci. 32 1628
[10] Du Z X, Lin W S, Gu A Z 2010 J. Supercrit. Fluids 55 116
[11] Yang C Y, Xu J L, Wang X D, Zhang W 2013 Int. J. Heat Mass Transfer 64 212
[12] Wang S X, Niu Z Y, Xu J L 2013 J. Chem. Ind. Eng. 64 3917 (in Chinese) [王淑香, 牛志愿, 徐进良 2013 化工学报 64 3917]
[13] Liu D Y, Wang Y W, Wang X, He K, Zhang X J, Yang C X 2012 Acta Phys. Sin. 61 150506 (in Chinese) [刘丹阳, 王亚伟, 王仙, 何昆, 张兴娟, 杨春信 2012 61 150506]
[14] Shao L, Han J T, Pan J H 2007 J. Refrigeration 28 23 (in Chinese) [邵莉, 韩吉田, 潘继红 2007 制冷学报 28 23]
[15] Fu C F, Wei Y Y, Duan Z Y, Wang W X, Duan Y B 2009 Chin.Phys.B 18 2749
[16] Liberto D M, Ciofalo M 2013 Int. J. Heat Mass Transfer 59 112
[17] Lin C X, Ebadian M A 1999 Int. J. Heat Mass Transfer 42 739
[18] Shao L, Han J T 2007 J. Hydrodynamics, Ser. B 19 677
[19] Mao Y F, Guo L J, Bai B F, Zhang X M 2010 Front. Energy Power Eng. China 4 546
[20] Dittus F W, Boelter L M K 1930 Univ. Calif. Publ. Eng. 2 443
[21] Xu X X, Chen G M, Tang L M, Zhu Z J 2011 Int. J. Energy Res. 35 1266
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