Numerical simulation of water spray in natural draft dry cooling towers with a new nozzle representation approach

Alkhedhair, Abdullah, Jahn, Ingo, Gurgenci, Hal, Guan, Zhiqiang, He, Suoying and Lu, Yuanshen (2016) Numerical simulation of water spray in natural draft dry cooling towers with a new nozzle representation approach. Applied Thermal Engineering, 98 924-935. doi:10.1016/j.applthermaleng.2015.10.118


Author Alkhedhair, Abdullah
Jahn, Ingo
Gurgenci, Hal
Guan, Zhiqiang
He, Suoying
Lu, Yuanshen
Title Numerical simulation of water spray in natural draft dry cooling towers with a new nozzle representation approach
Journal name Applied Thermal Engineering   Check publisher's open access policy
ISSN 1359-4311
1873-5606
Publication date 2016-01-15
Sub-type Article (original research)
DOI 10.1016/j.applthermaleng.2015.10.118
Open Access Status Not Open Access
Volume 98
Start page 924
End page 935
Total pages 12
Place of publication Kidlington, Oxford, United Kingdom
Publisher Pergamon Press
Collection year 2017
Language eng
Formatted abstract
Pre-cooling of inlet air with water spray is proposed for performance enhancement of natural draft dry cooling towers (NDDCTs) during high ambient temperature periods. Previous experiments showed promising results on cooling enhancement using spray cooling. In this study, a numerical Eulerian– Lagrangian 3-D model is used to simulate evaporating water sprays produced by real nozzles. A new adaptable method of hollow-cone spray representation in Eulerian–Lagrangian numerical models was developed to reproduce the real nozzle behaviour using experimentally measured initial spray characteristics and taking into account radial evolution of droplet size distribution and air/droplets momentum exchange. Experimental measurements from a wind tunnel test rig simulating NDDCTs inlet flow conditions have been performed for validation. Overall, a good agreement was obtained between numerical predictions and experimental measurements for the streamwise development of droplet size and velocity, and outlet air dry bulb temperature. An average deviation below 5.3% was achieved for all compared parameters. Moreover, the validated CFD model has provided insight into the experimental observations of local droplet velocity increase and higher air cooling in the lower region.
Keyword Spray cooling
Air pre-cooling
Natural draft
Spray representation
Rosin–Rammler
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mechanical & Mining Engineering Publications
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Created: Mon, 25 Jan 2016, 15:50:27 EST by Zhiqiang Guan on behalf of School of Mechanical and Mining Engineering