Skip to main content
SpringerLink
Log in

The Maximum Drop-Height of a Droplet in a Vertical Countercurrent Water–Air Heat and Moisture Exchange Tower Attached to a Main Fan Diffuser in a Coal Mine

  • Original Contribution
  • Published:
Journal of The Institution of Engineers (India): Series D Aims and scope Submit manuscript

Abstract

A vertical countercurrent water–air heat and moisture exchange tower attached to a main fan diffuser is designed. To reduce water loss blown away by the airflow from the exchange tower, the forces acting on droplets are analysed. Droplet motion may be classified under four conditions: (1) downward initial acceleration; (2) upward initial acceleration; (3) droplet blown away by airflow; (4) droplet suspension. With droplet break-up neglected, a general equation for the maximum droplet drop-height is presented and numerical calculations are performed. Equations for the maximum drop-height under Conditions 3 and 4 are deduced, and the equation for Condition 3 is applied to an engineering case study. The effect of air velocity on the maximum drop-height is more significant than that of other factors. The conclusions provide a novel approach to optimizing the design of vertical countercurrent water–air heat and moisture exchange towers attached to main fan diffusers.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Log in via an institution

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Fig. 1
Fig. 2
Fig. 3
Fig. 4
Fig. 5
Fig. 6
Fig. 7
Fig. 8
Fig. 9

Similar content being viewed by others

References

  1. D. Waples, J. Waples, A review and evaluation of specific heat capacities of rocks, minerals, and subsurface fluids: minerals and nonporous rocks. Nat. Resour. Res. 13(2), 97–122 (2004)

    Article  Google Scholar 

  2. D. Waples, J. Waples, A review and evaluation of specific heat capacities of rocks, minerals, and subsurface fluids: fluids and porous rocks. Nat. Resour. Res. 13(2), 123–130 (2004)

    Article  Google Scholar 

  3. D. Mottaghy, H. Vosteen, R. Schellschmidt, Temperature dependence of the relationship of thermal diffusivity versus thermal conductivity for crystalline rocks. Int. J. Earth Sci. 97(2), 435–442 (2008)

    Article  Google Scholar 

  4. J.X. Liu, X.F. Wang, Temperature field and ventilation simulation of stope in Hongtoushan mine. J. Coal Sci. Eng. (China) 14(2), 276–279 (2008)

    Article  Google Scholar 

  5. H.J. Chen, H.S. Qian, F. Yu, The tourism climatic environment of Shaoguan and its change analysis. J. Guang Zhou Univ. (Nat. Sci. Ed.) 6(2), 51–56 (2007)

    Google Scholar 

  6. X. Ji, X. Sun, B. Quan, Full recovery of exhaust heat from mine ventilation by water source heat pump. Build. Energy Effic. 38(12), 8–9 (2010)

    Google Scholar 

  7. L.J. Liu, J.M. Wang, P.Q. Ren, Application on return air source heat pump in heat recovery in a coal mine. Appl. Energy Technol. 29(10), 35–37 (2012)

    Google Scholar 

  8. J.G. Liu, Study and practice of low-carbon ecological mining construction of Jizhong Energy Group. J. China Coal Soc. 36(2), 317–321 (2011)

    Google Scholar 

  9. Y.S. Niu, J.X. Wang, J.X. Zhu, Coal mine waste heat recycling. J. Coal Mine Saf. 43(9), 194–196 (2012)

    Google Scholar 

  10. H.J. Cui, H.Q. Wang, S.Q. Chen, Y.Q. Li, A spraying device of recovering heat from exhausted air characteristed by water-saving and resistance-reducing for coal mine. National Utility Model Patent of China, ZL201320656280.2, 2014

  11. S.K. Li, Intermediate test of gas–water mold in the large spray tower. Electr. Power Environ. Prot. 12(2), 10–13 (1996)

    Google Scholar 

  12. X.N. Qi, Research on the shower cooling tower. Doctor’s Thesis, Shanghai Jiaotong University, 2008

  13. W.A. Sirignano, Fluid Dynamics and Transport of Droplets and Sprays (Cambridge University Press, Cambridge, 2010)

    Book  Google Scholar 

  14. ASHRAE, ASHRAE 1996: HVAC System and Equipment Handbook, chapt. 36 (American Society of Heating, Refrigerating and Air-Conditioning Engineers, Atlanta, 1996

  15. Y.P. Zhang, Y.X. Zhu, Y. Jiang, Theoretical analysis and modeling of overall heat transfer of air handling unit by using spraying water. J. Tsinghua Univ. (Sci. Technol.) 39(10), 35–38 (1999)

    Google Scholar 

  16. R.Y. Zhao, C.Y. Fan, D.H. Xue, Y.M. Qian, Air Conditioning (China Building Industry Press, Beijing, 1994)

    Google Scholar 

  17. S.C. Yao, V.E. Schrock, Heat and mass transfer from freely falling drops. Trans. ASME J. Heat Transf. 98(1), 120–126 (1976)

    Article  Google Scholar 

  18. W.C. Hinds, Aerosol Technology: Properties, Behavior, and Measurement of Airborne Particles (Wiley, New York, 1982)

    Google Scholar 

  19. S.A. Hossam, On the contribution of drag and turbulent stresses in the fragmentation of liquid droplets: a computational study. CFD Lett. 2(2), 97–105 (2010)

    Google Scholar 

Download references

Acknowledgments

The work described in this paper was supported by the National Natural Science Foundation of China and the Baoshan Steel & Iron Corporation (51074073), the National Natural Science Foundation of China and Shenhua Group Corporation Limited (U1361118), the State Key Laboratory for Geomechanics and Deep Underground Engineering (SKLGDUEK1018), the Open Research Fund Program of the Hunan Province Key Laboratory of Safe Mining Techniques of Coal Mines (Hunan University of Science and Technology) (201105) and the Project of Scientific Research Fund of the Hunan Provincial Education Department (12C1099).

Author information

Authors and Affiliations

  1. School of Mining and Safety Engineering, Hunan University of Science and Technology, Xiangtan, 411201, China

    S. Chen, H. Cui, H. Wang & J. Zhao

  2. State Key Laboratory for GeoMechanics and Deep Underground Engineering, China University of Mining & Technology (Beijing), Beijing, 100083, China

    S. Chen

  3. Hunan Province Engineering Research Centre of Mine Ventilation and Dust Removal Equipment, Hunan University of Science and Technology, Xiangtan, 411201, China

    S. Chen

Authors
  1. S. Chen
    View author publications

    You can also search for this author in PubMed Google Scholar

  2. H. Cui
    View author publications

    You can also search for this author in PubMed Google Scholar

  3. H. Wang
    View author publications

    You can also search for this author in PubMed Google Scholar

  4. J. Zhao
    View author publications

    You can also search for this author in PubMed Google Scholar

Corresponding author

Correspondence to S. Chen.

Rights and permissions

Reprints and permissions

About this article

Check for updates. Verify currency and authenticity via CrossMark

Cite this article

Chen, S., Cui, H., Wang, H. et al. The Maximum Drop-Height of a Droplet in a Vertical Countercurrent Water–Air Heat and Moisture Exchange Tower Attached to a Main Fan Diffuser in a Coal Mine. J. Inst. Eng. India Ser. D 95, 145–151 (2014). https://doi.org/10.1007/s40033-014-0042-8

Download citation

  • Received:

  • Accepted:

  • Published:

  • Issue Date:

  • DOI: https://doi.org/10.1007/s40033-014-0042-8

Keywords

Search

Navigation