Abstract
Conservation equations of sensible entarnsy and latent entransy are established for flue gas convective heat transfer with condensation in a rectangular channel and the entransy dissipation expression is deduced. The field synergy equation is obtained on the basis of the extremum entransy dissipation principle for flue gas convective heat transfer with condensation. The optimal velocity field is numerically obtained by solving the field synergy equation. The results show that the optimal velocity field has multiple longitudinal vortices, which improve the synergy not only between the veloctiy and temperature fields but also between the velocity and vapor concentration fields. Therefore, the convective heat and mass transfers are significantly enhanced. Flow with multiple longitudinal vortices close to the optimal velocity field can be generated by discrete double-inclined ribs set in the rectangular channel. The numerical results show that the total heat transfer rate in the discrete double-inclined rib channel increases by 29.02% and the condensing heat transfer rate increases by 27.46% for Re = 600 compared with the plain channel.
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References
Idem S A, Jacobi A M, Goldschmidt V W. Heat transfer characterization of a finned-tube heat exchanger (with and without condensation). ASME J Heat Transfer, 1990, 112: 64–70
Kawaguchi K, Okui K, Shimoura T, et al. Heat transfer and pressure loss characteristics of a heat exchanger for recovering latent heat. Heat Transfer-Asian Res, 2001, 36: 230–247
Jia L, Peng X F, Sun J D, et al. An experimental study on vapor condensation of wet flue gas in a plastic heat exchanger. Heat Transfer-Asian Res, 2001, 30: 571–580
Cao Y B, Ai X Y, Guo Q, et al. Investigation on forced convective heat transfer with steam condensation of flue by experiment (in Chinese). J Eng Thermophys Chin, 2000, 21: 729–733
Cui Y Z, Qian S X. Study on condensing heat transfer of plate-fintube heat exchanger for nature gas flue (in Chinese). J Shandong Institute Arch Eng, 2000, 15: 41–45
Wang L. Study of heat exchanger in condensing gas-fired water heater (in Chinese). Master Dissertation. Shanghai: Tongji University, 2006
Qi W. Study of heat transfer for wet mixture gas flowing over a finned tube (in Chinese). Master Dissertation. Beijing: Beijing Jiaotong University, 2007
Wu Y Y. Study on effective utilization of natural gas and heat and mass transfer (in Chinese). Master Dissertation. Beijing: Beijing University of Civil Engineering and Architecture, 2007
Bejan A. Advanced Engineering Thermodynamics. New York: Wiley, 1997
Guo Z Y, Zhu H Y, Liang X G. Entransy-A physical quantity describing heat transfer ability. Int J Heat Mass Transfer, 2007, 50: 2545–2556
Guo Z Y, Liang X G, Zhu H Y. Entransy-A physical quantity describing heat transfer ability (in Chinese). Prog Nat Sci, 2006, 16: 1288–1296
Wu J, Cheng X G, Meng J A, et al. Potential capacity dissipation extremum and entropy generation minimazation in laminar convective heat transfer (in Chinese). J Eng Thermophys Chin, 2006, 27: 100–102
Chen Q, Wu J, Ren J X. Thermodanamic optimization and heat transfer optimization for convective heat transfer (in Chinese). J Eng Thermophys Chin, 2008, 29: 271–274
Liu X B, Meng J A, Guo Z Y. Entropy generation extremum and entransy dissipation extremum for heat exchanger optimization. Chinese Sci Bull, 2009, 54: 943–947
Chen Q, Wang M R, Pan N, et al. Optimization principles for convective heat transfer. Energy, 2009, 34: 1199–1206
Liu X B, Guo Z Y. A novel method for heat exchanger analysis (in Chinese). Acta Phys Sin, 2009, 58: 4766–4771
Chen L, Chen Q, Li Z, et al. Optimization for a heat exchanger couple based on the minimum thermal resistance principle. Int J Heat Mass Transfer, 2009, 52: 4778–4784
Meng J A, Liang X G, Li Z X. Field synergy optimization and enhanced heat transfer by multi-longitudinal vortices flow in tube. Int J Heat Mass Transfer, 2005, 48: 3331–3337
Song W M, Meng J A, Li Z X. Optimal velocity field for laminar convective heat transfer in rectangular channel (in Chinese). In: Proceedings of Heat and Mass Transfer by China Engineering Thermophysics Society, Tsingtao, 2009
Chen L, Chen Q, Li Z, et al. Moisture transfer resistance method for liquid desiccant dehumidification analysis and optimization. Chinese Sci Bull, 2010, 55: 1445–1453
Liu W, Liu Z C, Guo Z Y. Physical quantity synergy in laminar flow field of convective heat transfer and analysis of heat transfer enhancement. Chinese Sci Bull, 2009, 54: 3579–3586
Chen Q, Ren J X, Guo Z Y. Fluid flow field synergy principle and its application to drag reduction. Chinese Sci Bull, 2008, 53: 1768–1772
Chen Q, Yang K D, Wang M R, et al. A new approach to analysis and optimization of evaporative cooling system I: Theory. Energy, 2010, 35: 2448–2454
Li X W, Yan H, Meng J A, et al. Visualization of longitudinal vortex flow in an enhanced heat transfer tube. Exp Therm Fluid Sci, 2005, 31: 601–608
Li X W, Meng J A, Guo Z Y. Turbulent flow and heat transfer in discrete double inclined ribs tube. Int J Heat Mass Transfer, 2009, 52: 962–970
Song W M, Meng J A, Li Z X. Numerical study of air-side performance of a finned flat tube heat exchanger with crossed discrete double inclined ribs. Appl Therm Eng, 2010, 30: 1807–1814
Meng J A, Liang X G, Chen Z J, et al. Experimental study on convection heat transfer in alternating elliptical axis tubes. Exp Therm Fluid Sci, 2005, 29: 457–465
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Song, W., Meng, J. & Li, Z. Optimization of flue gas convective heat transfer with condensation in a rectangular channel. Chin. Sci. Bull. 56, 263–268 (2011). https://doi.org/10.1007/s11434-010-4270-5
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DOI: https://doi.org/10.1007/s11434-010-4270-5