Study of the Evaporation Process in the Spray Zone of a Mechanical Draft Wet Cooling Tower
Keywords:evaporation process, nozzle spray, cooling tower, droplet level, heat and mass transfer.
The evaporation process in the nozzle spray system of a cooling tower was the main object of study in order to determine its performance. This process involves liquid water in small size, usually at the droplet level. At this level, parameters that affect the droplet size, such as capacity, air velocity in the chamber, water pressure at the nozzle, atmospheric temperature, etc., influence the process of heat and mass transfer. In this study, capacity and fan rotation were varied to obtain a graph showing the evaporation. Radius, velocity, mass and temperature graphs and rate graphs were obtained from mathematical modeling of the governing equations. From the results it appears that evaporation occurs at a capacity of 6 liter per minute and above, but this requires further proof of the evaporation process along with the height of the tower, which will be the subject of a future study.
Chen, G., Zhao, Y., Li, W. & Ge, W., The Efficiency of High-Level Water Collecting Cooling Tower with The Installation of Cross Wall Affect by The Evolution of Aerodynamic Field, Applied Thermal Engineering, 161, 114181, 2019.
Chen, X., Sun, F., Chen, Y. & Gao, M., Novel Method for Improving the Cooling Performance of Natural Draft Wet Cooling Towers, Applied Thermal Engineering, 147, pp. 562-570, 2019.
Chen, X., Sun, F. & Lyu, D., Field Test Study on Water Droplet Diameter Distribution in The Rain Zone of a Natural Draft Wet Cooling Tower, Applied Thermal Engineering, 162, 114252, 2019.
Zunaid, M., Murtaza, Q. & Gautam, S., Energy and Performance Analysis of Multi Droplets Shower Cooling Tower at Different Inlet Water Temperature for Air Cooling Application, Applied Thermal Engineering, 121, pp. 1070-1079, 2017.
Chen, G., Zhao, Y., Ge, W. & Li, W., Critical Guidelines to Cope with the Adverse Impacts of The Inner Peripheral Vortex in the High-level Water Collecting Natural Draft Wet Cooling Tower, Applied Thermal Engineering, 168, 114819, 2020.
Lyu, D., Sun, F. & Zhao, Y., Experimental Study on the Air Flow Field in the Water Collecting Devices, Applied Thermal Engineering, 105, pp. 961-970, 2016.
Wang, M., Wang, J., Wang, J. & Shi, C., Contrastive Analysis of Cooling Performance between a High-level Water Collecting Cooling Tower and a Typical Cooling Tower, Journal of Thermal Science, 27(1), pp. 39-47, 2018.
Fisenko, S.P., Brin, A.A. & Petruchik, A.I., Evaporative Cooling of Water in A Mechanical Draft Cooling Tower, International Journal of Heat and Mass Transfer, 47, pp. 165-177, Jan. 2004.
Chen, L., Huang, X., Yang, L., Du, X. & Yang, Y., Evaluation of Natural Draft Dry Cooling System Incorporating Water Spray Air Precooling, Applied Thermal Engineering, 151, pp. 294-307, 2019.
Fisenko, S.P., Petruchik, A.I. & Solodukhin, A.D., Evaporative Cooling of Water in a Natural Draft Cooling Tower, International Journal of Heat and Mass Transfer, 45(23), pp. 4683-4694, 2002.
Kooij, S., Sijs, R., Denn, M.M., Villermaux, E. & Bonn, D., What Determines the Drop Size in Sprays? Physical Review X, 8, 031019, 2018.
Kuznetsov, G.V., Strizhak, P.A. & Volkov, R.S., Heat Exchange of an Evaporating Droplet in a High-temperature Environment, International Journal of Thermal Sciences, 150, 106227, 2020.
Kuznetsov, G.V., Piskunov, M.V., Volkov, R.S. & Strizhak, P.A., Unsteady Temperature Fields of Evaporating Water Droplets Exposed to Conductive, Convective and Radiative Heating, Applied Thermal Engineering, 131, pp. 340-355, 2018.
Volkov, R.S. & Strizhak, P.A., Research of Temperature Fields and Convection Velocities in Evaporating Water Droplets Using Planar Laser-Induced Fluorescence and Particle Image Velocimetry, Experimental Thermal and Fluid Science, 97, pp. 392-407, 2018.
Movahednejad, E., Ommi, F. & Hosseinalipour, S.M., Prediction of Droplet Size and Velocity Distribution in Droplet Formation Region of Liquid Spray, Entropy, 12, pp. 1484-1498, Jun. 2010.
Minchacam, J.I., Castillejose, A.H. & Acostag, F.A., Size and Velocity Characteristics of Droplets Generated by Thin Steel Slab Continuous Casting Secondary Cooling Air-Mist Nozzles, Metallurgical and Materials Transactions B, 42B, pp. 500-515, 2011.
Afzalifar, A., Saaresti, T.T. & Grman, A., Comparison of Moment-Based Methods for Representing Droplet Size Distributions in Supersonic Nucleating Flows of Steam, Journal of Fluids Engineering, 140(2), 021301, Sep. 2017.
Onishi, R., Matsuda, K. & Takahashi, K., Lagrangian Tracking Simulation of Droplet Growth in Turbulence-turbulence Enhancement of Autoconversion Rate, Journal of the Atmospheric Sciences, 72, pp. 2591-2607, 2015.
Akkus, Y., Dursunkaya, Z. & tin, B., An Iterative Solution Approach to Coupled Heat and Mass Transfer in a Steadily Fed Evaporating Water Droplet, Journal of Heat Transfer, 141(3), 031501, Jan. 2019.
Russo, E., Kuerten, J.G.M., van der Geld, C.W.M. & Geurts, B.J., Water Droplet Condensation and Evaporation in Turbulent Channel Flow, Journal of Fluid Mechanics, 749, pp. 666-700, 2014.
Gilani, N., Hendijani, A.D. & Shirmohammadi, R., Developing of a Novel Water-Efficient Configuration for Shower Cooling Tower Integrated with the Liquid Desiccant Cooling System, Applied Thermal Engineering, 154, pp. 180-195, 2019.
Pedraza, O.J.G., Ibarra, J.J.P., Maya, C.R., Gonzez, S.R.G. & Arista, J.A.R., Numerical Study of the Drift and Evaporation of Water Droplets Cooled Down by a Forced Stream of Air, Applied Thermal Engineering, 142, pp. 292-302, 2018.
Strizhak, P.A., Volkov, R.S., Castanet, G., Lemoine, F., Rybdylova, O. & Sazhin, S.S., Heating and Evaporation of Suspended Water Droplets: Experimental Studies and Modelling, International Journal of Heat and Mass Transfer, 127, pp. 92-106, 2018.
Zhao, Y., Sun, F., Long, G., Huang, X., Huang, W. & Lyv, D., Comparative Study on the Cooling Characteristics of High-level Water Collecting Natural Draft Wet Cooling Tower and the Usual Cooling Tower, Energy Conversion and Management, 116, pp. 150-164, 2016.
Li, H.W., Wu, K.B., Wang, S.B., Numerical Simulation of The Influence of Flue Gas Discharge Patterns on a Natural Draft Wet Cooling Tower with Flue Gas Injection, Applied Thermal Engineering, 161, 114137, 2019.
Ni, P., A Fuel Droplet Vaporization Model in a Hot Air Stream, Applied Mathematical Modelling, 34, pp. 2370-2376, 2010.
Huang, X., Chen, L., Yang, L., Du, X. & Yang, Y., Evaporation Aided Improvement for Cooling Performance of Large-scale Natural Draft Dry Cooling System, Applied Thermal Engineering, 163, 114350, 2019.