The impact of fog nozzle type on the distribution of mass spray density

Wąsik, Wiktor; Walczak, Agata; Węsierski, Tomasz

doi:10.1051/matecconf/201824700058

Cited by 4 publications

(5 citation statements)

References 35 publications

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“…On the basis of the averages obtained, the flow characteristics Q=f(p) and the average value of the K-factor were established for the 4 nozzles. The coefficient of the individual measurement series was determined from the formula (Wąsik et al 2018):…”

Section: Methodsmentioning

confidence: 99%

“…The aim of the study was, therefore, to assess the influence of the supply pressure of mist nozzles on the efficiency of the ammonia absorption process with the streams generated by them. The structure of the dispersed stream depends mainly on the type of nozzle (Majder-Łopatka et al 2016, Hua et al 2018, Orzechowski and Prywer 2018, Orzechowski and Prywer 2008, Wąsik et al 2018, and for this reason, different types of mist nozzles were used in the tests, characterized by different parameters of the produced water streams. For each nozzle type, flow characteristics were established to determine the effect of pressure on nozzle efficiency Q=f(p) and curves of change in ammonia concentration as a function of time C=f(t), at different nozzle supply pressures.…”

Section: Introductionmentioning

confidence: 99%

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Effect of mist nozzle supply pressure on the ammonia absorption process

2023

Archives of Environmental Protection

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The article shows the effect of the supply pressure of mist nozzles on the process of ammonia sorption. In the tests, the nozzles flow characteristics Q=f(p) and the dependence of NH 3 concentration as a function of the water stream feeding in time at different supply pressures were determined. For the TF 6 NN, TF 6 V, NF 15, CW 50 nozzles, measurements were carried out at the following supply pressures: 0.1 MPa; 0.2 MPa; 0.3 MPa; 0.4 MPa; 0.5 MPa. It was observed that the greatest effect of nozzle feed pressure on ammonia sorption efficiency may be expected at lower pressure values. At higher values, the sorption rate becomes stabilized and even starts to decrease. The decreases in the sorption rate constant observed for higher pressures may be due to a reduction contact time of the droplet and the achievement of the critical mixing rate of ammonia vapors in the air intensively saturated with water streams. This is due to diffusion rate limitations. The measurements show that the use of supply pressures for mist nozzles above 0.4 MPa is not justified. It should be noted that varying the feed pressure of nozzles of various designs can affect their ammonia sorption efficiency differently. The type of nozzle and supply pressure affects the distribution of droplets in space. The angle of dispersion and the shape of the generated jet have a critical influence on the efficiency of the sorption process. Complete filling of the space and a large spray angle assure relatively high sorption efficiency.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of mist nozzle supply pressure on the ammonia absorption process

2023

Archives of Environmental Protection

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“…In the abovementioned CU–DU linear relationship, the slope coefficient represents the ratio between half of the difference ( S l /2) of the difference between the sprinkler water depth and the mean value of the sprinkler water amount at each radial point and the water deviation ( m ) of the low value of the N /4 sprinkler water amount and the mean value of the sprinkler water amount. Evidently, the value of the slope coefficient is related to the actual sprinkler water distribution characteristics of the sprinklers, and many factors, such as the sprinkler type, working pressure, combination spacing, wind speed and wind direction, affect the actual sprinkler water distribution characteristics of the sprinklers (Faria et al, 2019; Mateos, 1998; Wąsik et al, 2018), which also explains why the CU and DU relationship equations had different slope coefficients in previous studies. The plots of the linear regression relationship between DU and CU, as well as the deviation relationship between DU and CU by Seniwongse and Reynolds (1972), Keller and Bliesner (1990), Jiusheng et al (1998), among others, are shown in Figure 2, where the deviation relationship is expressed as the relative deviation rate

ζ

(Equation ), and the relative deviation explains the relative distance between the two and objectively describes the gap between them.…”

Section: Effect Of the Slope Coefficient On The Numerical Relationshi...mentioning

confidence: 98%

Sprinkler irrigation uniformity assessment: Relational analysis of Christiansen uniformity and Distribution uniformity

Xue

Wei

et al. 2023

Irrigation and Drainage

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Christiansen uniformity (CU) and Distribution uniformity (DU) are the most commonly used irrigation quality evaluation indicators, focusing on overall uniformity and local water deficit, respectively. Clarifying the quantitative relationship between the CU and DU has important production value for determining the water distribution characteristics of whole and localized areas in the evaluation of sprinkler irrigation water uniformity and improving the quality of sprinkler irrigation. This paper analyses the relationship between the calculation formulas of CU and DU based on mathematical analysis. The results reveal a prominent linear relationship between CU and DU, and the sum of the slope coefficient and the constant term of the linear relationship equation is 1. The value of the slope coefficient of the CU–DU linear relationship characterizes the differentiated form of the sprinkler water distribution. The slope coefficient is determined by the nozzle type, operating parameters and working scenarios. Notably, the specific form of the linear relationship obtained by fitting the experimental results in the literature is not universal. The mapping relationship between the value of the slope coefficient and the distribution form of sprinkler irrigation water quantity was established, and the influence of the value range of the slope coefficient on the DU of the overall and local sprinkler irrigation water quantity was demonstrated. The results show that the deviation rates of CU and DU decrease with increasing slope coefficient. When the slope coefficient is less than 1, CU is greater than DU; and the slope coefficient ranges from 0.46 to 1.36. When the slope coefficient is 0.625, the possibility of uniform irrigation is the highest. This research helps to overcome the limitations of CU and DU for irrigation uniformity evaluation and provides a reference for carrying out sprinkler irrigation uniformity evaluation with comprehensive characterization capabilities.

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“…Spiral nozzles have been found in different applications including flue gas desulfurization and spray towers [4,5,32], spray drying [33], distillation [34], petrochemical industry [35], and fire suppression [36,37]. Several studies tried to focus on the basic spray characteristics including droplet-size distribution, the inlet liquid pressure-flowrate relationship, and mass spray density [38][39][40][41] at different hydrodynamic conditions. Some authors did a research on the spray surface geometry [42] and even air-assisted atomization using the spiral nozzle [43].…”

Section: Introductionmentioning

confidence: 99%

“…They further simulated the model using MATLAB, which validated its effectiveness and provided a theoretical basis for designing and manufacturing the spiral nozzles. Wasik et al [38] studied the influence of nozzle type (including a TF6 spiral nozzle) on a mass spray density. For other works on spiral nozzles, especially those with different application, refer to [33][34][35].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Spray Breakup in Turbulent Atomization Using a Spiral Nozzle

2019

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Spiral nozzles are widely used in wet scrubbers to form an appropriate spray pattern to capture the polluting gas/particulate matterwith the highest possible efficiency. Despite this fact, and a fact that it is a nozzle with a very atypical spray pattern (a full cone consisting of three concentric hollow cones), very limited amount of studies have been done so far on characterization of this type of nozzle. This work reports preliminary results on the spray characteristics of a spiral nozzle used for gas absorption processes. First, we experimentally measured the pressure impact footprint of the spray generated. Then effective spray angles were evaluated from the photographs of the spray and using the pressure impact footprint records via Archimedean spiral equation. Using the classical photography, areas of primary and secondary atomization were determined together with the droplet size distribution, which were further approximated using selected distribution functions. Radial and tangential spray velocity of droplets were assessed using the laser Doppler anemometry. The results show atypical behavior compared to different types of nozzles. In the investigated measurement range, the droplet-size distribution showed higher droplet diameters (about 1 mm) compared to, for example, air assisted atomizers. It was similar for the radial velocity, which was conversely lower (max velocity of about 8 m/s) compared to, for example, effervescent atomizers, which can produce droplets with a velocity of tens to hundreds m/s. On the contrary, spray angle ranged from 58° and 111° for the inner small and large cone, respectively, to 152° for the upper cone, and in the measured range was independent of the inlet pressure of liquid at the nozzle orifice.

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The impact of fog nozzle type on the distribution of mass spray density

Cited by 4 publications

References 35 publications

Effect of mist nozzle supply pressure on the ammonia absorption process

Effect of mist nozzle supply pressure on the ammonia absorption process

Sprinkler irrigation uniformity assessment: Relational analysis of Christiansen uniformity and Distribution uniformity

Experimental Study on Spray Breakup in Turbulent Atomization Using a Spiral Nozzle

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