Flow characteristics of liquid nitrogen through solid-cone pressure swirl nozzles

Liu, Xiufang; Xue, Renyu; Ruan, Yixiao; Chen, Liang; Zhang, Xingqun

doi:10.1016/j.applthermaleng.2016.08.150

Cited by 30 publications

(20 citation statements)

References 18 publications

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“…The wall temperature keeps unchanged as 673 K. Figure 4(a) shows the system boundary conditions. Natural industry water in 283 K is served and sprayed by solid-cone pressure swirl nozzles which are widely used due to simple geometry and excellent atomizing performance [18]. The nozzle parameters include orifice diameter 2.0 mm, spray angle 60°, spray height 0.36 m, upstream pressure 0.6 MPa and flow rate 0.1 kg/s.…”

Section: Simulation Conditionsmentioning

confidence: 99%

Effects of multiple-nozzle distribution on large-scale spray cooling via numerical investigation

et al. 2019

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Spray cooling has been widely employed in many applications due to its high flux removal ability. A previous study has been conducted to reveal the large-scale spray cooling performance of an industrial used single nozzle. Continuously, influence of multiple-nozzle distribution has also been numerically investigated in present work. The mean heat flux and its standard deviation and uniformity are used to qualify the cooling performance. A flat wall with 1.6 m in length and 1.0 m in width has been taken as the research object. Effects of nozzle number, distance and offset have been parametrically compared. It is found that increasing nozzle number could promote mean heat flux, improve the uniformity of cooling patterns and enhance heat transfer performance. A best nozzle number of 10 could be obtained by an equation fitting. Decreasing nozzle distance turns out to be detrimental to heat transfer. The reason comes from the collisions and interactions of two too adjacent nozzles. Based on choices in real practice, two types of arrays i. e. perpendicular and skew array have been discussed and compared. It is concluded that the skew array could obtain higher heat flux with more uniform distribution.

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Section: Simulation Conditionsmentioning

confidence: 99%

Effects of multiple-nozzle distribution on large-scale spray cooling via numerical investigation

et al. 2019

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“…Most importantly the wall has an extremely low rotating speed (usually 1-3 rpm) in real practice. The nozzle is solid-cone pressure swirl which is most commonly used due to its simple geometry and excellent atomizing performance [16].…”

Section: Physical Modelmentioning

confidence: 99%

“…Another one is to change the structures of the flat heated surface such as increasing surface roughness [11] and processing fins [12,13] and other micro-structures [14]. Thirdly on flow characteristics this aspect includes several fields such as droplet dynamics [15], discharging rates [16], and flow structures. For example, Vouros, et al [17] studied experimentally the influence of heated surface on the development of jet sprays and found that heat flux from heated surface would influence the evolution of spray jet.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of single-nozzle large scale spray cooling on drum wall

Chen¹,

Xie²,

Gong³

et al. 2018

THERM SCI

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In this work the single-nozzle spray cooling on a large scale industry-used drum wall has been simulated by a verified numerical model. For a certain spray nozzle, the effects of four parameters, i. e. different spray pressures, different spray heights, different water temperatures, and different wall temperatures, on heat transfer have been analyzed. It is found that the mean heat flux distributions show concentric elliptical circles. Increasing spray pressures will enhance the cooling performance. Decreasing spray heights will improve the heat flux in direct spray areas other than whole simulated drum wall. As expected, reducing water temperature or advancing wall temperature will raise the average wall flux. Both relationships are exponential. The influencing degrees of the four parameters have been compared through Taguchi orthogonal experimental method and the result is: wall temperature > spray pressure > water temperature > spray height. The wall temperature, spray pressure, and water temperature show dominant effects except for the spray height.

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“…Presently, researchers are paying attention to the atomization quality of spray in terms of the spray angle, particle size, and velocity distribution. [16][17][18][19] Although the above studies discussed the dynamic characteristics of an injector (including the liquid filling, breakup process, and spray pattern as mentioned earlier), they were essentially aimed at the classical swirl injector. However, there are many differences between the formation and breakup process of the spray of an open-end swirl injector and that of a classical swirl injector because of their structural differences.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the spray formation and breakup process in an open-end swirl injector

Chen

Tang

2020

Science Progress

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The spray formation and breakup process in an open-end swirl injector were studied through experiments and numerical simulations. A high-speed shadowgraph system and a high-speed backlight system were adopted to record the spray. Volume of fluid was used as the interface tracking method to capture the evolution process. The filling process of the liquid film inside the injector was captured. The air core formation process as observed in the experiments differed from that depicted by the numerical simulation results. The results revealed that the spray pattern of the cross-section at the tangential inlets also varied during the filling process. The evolution of the holes on the liquid film and ligaments was observed. It was determined that the liquid sheet repeatedly exhibited thinning, instability, shedding, breakup, and coalescence in the spray formation and breakup process. The spray pattern underwent the distorted pencil stage, onion stage, tulip stage, and fully developed stage with the increased injection pressure drop. The formation process of the open-end swirl injector also underwent these four stages under an injection pressure drop of 0.5 MPa.

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Flow characteristics of liquid nitrogen through solid-cone pressure swirl nozzles

Cited by 30 publications

References 18 publications

Effects of multiple-nozzle distribution on large-scale spray cooling via numerical investigation

Effects of multiple-nozzle distribution on large-scale spray cooling via numerical investigation

Numerical simulation of single-nozzle large scale spray cooling on drum wall

Investigation of the spray formation and breakup process in an open-end swirl injector

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