Effects of Nozzle Configuration on Efficiency of Direct-Contact Gas-Vapor Mixture Generators

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Abstract

Numerical simulation of water spray evaporation in hot flue gas flow provided a dataset that was used to find correlation between evaporation efficiency and nozzle design parameters: mean droplet diameter, spray cone angle and hollowness. Fitted with linear model simulation data were extrapolated outside their original ranges to find the maximum, and corresponding efficiency vector. This vector was interpreted as a preferred direction of nozzle design optimization: provide wide hollow cones. Moreover, it was shown that positive correlation between evaporation efficiency and spray cone outer angle becomes stronger as its hollowness increases. However, it was pointed out that evaporation efficiency of narrow hollow sprays can be less than of full cone sprays in certain conditions. It was also found that droplet size when below 1 mm is almost irrelevant to spray evaporation efficiency.

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About the authors

M. N. Nikitin

Samara State Technical University

Author for correspondence.
Email: max@nikitin-pro.ru
Russian Federation, Samara

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Supplementary files

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2. Fig. 1. The scheme of the calculation area

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3. Fig. 2. Input (red) and output (yellow) sections of the computational domain: initial (left) and optimized (right) options

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4. Fig. 3. The residuals of the linear model in each approximation of the direct basis search

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5. Fig. 4. Dependence of evaporation efficiency on the angle and completeness of the spray cone

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6. Fig. 5. Dependence of evaporation efficiency on the angle of the spray cone and the average droplet size

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7. Fig. 6. Dependence of the spray evaporation efficiency on the nozzle configuration

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