THERMAL SCIENCE

International Scientific Journal

Authors of this Paper

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Dan Mei

,

Yuzheng Zhu

,

Xuemei Xu

,

Futang Xing

ENERGY CONSERVATION AND HEAT TRANSFER ENHANCEMENT FOR MIXED CONVECTION ON THE VERTICAL GALVANIZING FURNACE

ABSTRACT
The alloying temperature is an important parameter that affects the properties of galvanized products. The objective of this study is to explore the mechanism of conjugate mixed convection in the vertical galvanizing furnace and propose a novel energy conservation method to improve the soaking zone temperature based on the flow pattern and heat transfer characteristics. Herein, the present study applied the k-ε two-equation turbulence model to enclose the Navier-Stokes fluid dynamic and energy conservation equations, and the temperature distributions of the steel plate and air-flow field in the furnace were obtained for six Richardson numbers between 1.91 ⋅ 105 and 6.30 ⋅ 105. In the industrial practice, the side baffles were installed at the lateral opening of the cooling tower to alter the height of vertical flow passage, which affected the Richardson number. The results indicate that the Richardson number of 2.4 ⋅ 105 generated the highest heat absorption and maximal temperature in the steel plate due to the balance between natural and forced convection. Furthermore, the results of the on-line experiments validated the simulation research. The method enhanced the steel plate temperature in the soaking zone without increasing the heat power, thereby characterizing it as energy conservation technology.
KEYWORDS
energy conservation, Vertical galvanizingfurnace, heat transfer, mixed convection, numerical simulation
PAPER SUBMITTED: 2018-01-05
PAPER REVISED: 2018-05-04
PAPER ACCEPTED: 2018-06-07
PUBLISHED ONLINE: 2018-09-29
DOI REFERENCE: https://doi.org/10.2298/TSCI180105180M
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2020, VOLUME 24, ISSUE Issue 2, PAGES [1055 - 1065]
REFERENCES
  1. Yi, L. I., and G. Y. Chen. Relevent Equipments of Hot Galvanization Technology and Continuous Annealing Furnace. Heat Treatment Technology & Equipment. 3 (2010), pp.012.
  2. You, Y., Fan, A., Luo, X., Jin, S., Wei, L., & Huang, S. An investigation in the effects of recycles on laminar heat transfer enhancement of parallel-flow heat exchangers. Chemical Engineering & Processing Process Intensification. 70 (2013), pp.27-36
  3. You Y, Zhang F, Fan A, et al. A numerical study on the turbulent heat transfer enhancement of Rodbaffle heat exchanger with staggered tubes supported by round rods with arc cuts. Applied Thermal Engineering. 76 (2015), pp.220-232.
  4. Veranth, John M., G. D. S. And, and D. W. Pershing. Numerical Modeling of the Temperature Distribution in a Commercial Hazardous Waste Slagging Rotary Kiln. Environmental Science & Technology. 31 (1997), pp. 2534-2539.
  5. Mastorakos, E., et al. CFD predictions for cement kilns including flame modelling, heat transfer and clinker chemistry. Applied Mathematical Modelling. 23 (1999), pp.55-76.
  6. Moon, Sungdeuk, and A. N. Hrymak. Scheduling of the batch annealing process — deterministic case. Computers & Chemical Engineering. 23 (1999), pp.1193-1208.
  7. Khanafer, Khalil, K. Vafai, and M. Lightstone. Buoyancy-driven heat transfer enhancement in a two-dimensional enclosure utilizing nanofluids. International Journal of Heat & Mass Transfer. 46 (2003), pp.3639-3653.
  8. Rana, P., and R. Bhargava. Numerical study of heat transfer enhancement in mixed convection flow along a vertical plate with heat source/sink utilizing nanofluids. Communications in Nonlinear Science & Numerical Simulation. 16 (2011), pp.4318
  9. Sekhar, Y. R., K. V. Sharma, and S. Kamal. Nanofluid heat transfer under mixed convection flow in a tube for solar thermal energy applications. Environmental Science and Pollution Research. 23 (2016), pp.9411-9417.
  10. Biswas, G., N. K. Mitra, and M. Fiebig. Computation of laminar mixed convection flow in a channel with wing type built-in obstacles. Journal of Thermophysics & Heat Transfer. 3 (2015), pp.447-453.
  11. Sreenivasulu, B., and B. Srinivas. Mixed convection heat transfer from a spheroid to a Newtonian fluid. International Journal of Thermal Sciences. 87 (2015), p.1-18.
  12. Ajmera, Satish Kumar, and A. N. Mathur. Experimental investigation of mixed convection in multiple ventilated enclosure with discrete heat sources. Experimental Thermal & Fluid Science. 68 (2015), pp. 402-411.
  13. Yang, G., J. Y. Wu, and L. Yan. Flow reversal and entropy generation due to buoyancy assisted mixed convection in the entrance region of a three-dimensional vertical rectangular duct. International Journal of Heat & Mass Transfer. 67 (2013), pp.741-751.
  14. Dritselis, C. D., et al. Buoyancy-assisted mixed convection in a vertical channel with spatially periodic wall temperature. International Journal of Thermal Sciences. 65 (2013), pp.28-38.
  15. Saleem, M., M. A. Hossain, and S. C. Saha. Mixed Convection Flow of Micropolar Fluid in an Open Ended Arc-Shape Cavity. ASME J. Fluids Eng. 134 (2012), pp.91-101.
  16. Sharma, Neha, A. K. Dhiman, and S. Kumar. Mixed convection flow and heat transfer across a square cylinder under the influence of aiding buoyancy at low Reynolds numbers. International Journal of Heat & Mass Transfer. 55 (2012), pp.2601-2614
  17. Garoosi, Faroogh, G. Bagheri, and M. M. Rashidi. Two phase simulation of natural convection and mixed convection of the nanofluid in a square cavity. Powder Technology. 275 (2015), pp.239-256.
  18. Patil, P. M., E. Momoniat, and S. Roy. Influence of convective boundary condition on double diffusive mixed convection from a permeable vertical surface. International Journal of Heat & Mass Transfer. 70 (2014), pp.313-321.
  19. Mehrizi, A. Abouei, et al. Mixed convection heat transfer in a ventilated cavity with hot obstacle: effect of nanofluid and outlet port location. International Communications in Heat and Mass Transfer. 39 (2012), pp.1000-1008.
  20. Mahmoodi, M. Mixed convection inside nanofluid filled rectangular enclosures with moving bottom wall. Thermal science. 15 (2011), pp.889-903.
  21. Coussirat, M., et al. Computational Fluid Dynamics modeling of impinging gas-jet systems. I. Assessment of eddy viscosity models. ASME J. Fluids Eng. 127 (2005), pp.691-703.
  22. Coussirat, M., et al. Computational Fluid Dynamics modeling of impinging gas-jet systems. II. Application to an industrial cooling system device. ASME J. Fluids Eng. 127 (2005), pp.704-713.
  23. Mathews, Roy N., and C. Balaji. Numerical simulation of conjugate, turbulent mixed convection heat transfer in a vertical channel with discrete heat sources. International Communications in Heat & Mass Transfer. 33 (2006), pp.908-916.
  24. Deng, Qi Hong, et al. Fluid, heat and contaminant transport structures of laminar double-diffusive mixed convection in a two-dimensional ventilated enclosure. International Journal of Heat & Mass Transfer. 47 (2004), pp.5257-5269.
  25. ANSYS CFX user guide. Ansys Inc, (2016).
  26. ANSYS ICEM CFD user guide. Ansys Inc, (2016).
  27. M Dan, X Futang, L Peng, F Zhi. Numerical simulation of mixed convection heat transfer of galvanized steel sheets in the vertical alloying furnace. Applied Thermal Engineering. 93 (2016), pp.500-508.
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Energy conservation and heat transfer enhancement for mixed convection on the vertical galvanizing furnace

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