Impact dynamics and morphology of urea-water-solution droplets impinging on a hot plate under urea-SCR relevant conditions: Influence of surface tension

Kulkarni, Aniket P.; Megaritis, Thanos; Ganippa, Lionel

doi:10.1016/j.fuel.2021.120671

Cited by 5 publications

(2 citation statements)

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“…The advantage of blade mixers is their simplicity and the possibility of the use of the blades as impingement plates for droplets [47]. This may lead to droplet break-ups and the reduction of their size [28]. Additionally, static mixers reduce the velocity deviations of the gas entering the SCR catalyst [39].…”

Section: Introductionmentioning

confidence: 99%

“…The authors stressed that SCR mixers are incapable of reaching a high performance in all applications and conditions. Kulkarni et al [28] proposed reducing UWS surface tension by adding surfactant. The authors stated that this addition might improve mixing in urea-SCR systems due to the enhanced evaporation, attributed to the increased spreading factors of the droplets (ratios of a lamella size to the droplet diameter before the collision) and the narrower droplet size distributions reached for the secondary droplets.…”

Section: Introductionmentioning

confidence: 99%

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Numerical evaluation of urea-mixing devices for close-coupled selective catalytic reduction systems

Kaźmierski¹,

Kapusta²

2023

Combustion Engines

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The following research presents a numerical evaluation of existing and conceptual urea-mixing devices used in close-coupled (to the engine) selective catalytic reduction (SCR) systems. The analysis was aimed at the assessment of urea-mixing devices that could considerably enhance the reduction of nitrogen oxides from the diesel-engine combustion process under a wide range of operating conditions, including cold starts. The analysis showed that replacing blade-equipped static mixers with perforated stationary mixing devices may provide a more uniform spatial distribution of ammonia at the inlet to the SCR catalyst and reduce pressure drops generated by mixing devices. Moreover, the conceptual mixing devices, based on combinations of the blade and perforated mixers to develop intensive turbulence, enabled the increase of the mixing length leading to effective decomposition of the urea-water solution (UWS), and provided uniform spatial distribution of ammonia, even for the small-sized mixing systems. However, the intensive mixing was often associated with a significant rise in the pressure drop.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%