The Experts below are selected from a list of 2895 Experts worldwide ranked by ideXlab platform
Bin Xu - One of the best experts on this subject based on the ideXlab platform.
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correlation analysis of superheated liquid jet breakup to bubble formation in a transparent slit nozzle
Experimental Thermal and Fluid Science, 2015Co-Authors: Shiyan Li, Yuyin Zhang, Bin XuAbstract:Abstract This investigation is to evaluate and quantify the influence of bubble formation inside the nozzle on breakup characteristics of a superheated liquid jet outside the nozzle. The effect of fuel properties was examined using methanol, ethanol and butanol. A unique optically-transparent slit nozzle with a high-speed micro-imaging system were utilized for quantifying the bubble formation inside and the liquid jet breakup outside the nozzle. Correlation between bubble number density and breakup of superheated liquid jet was obtained for all the fuel. The bubble is demonstrated as the main driving forces enhancing the breakup of superheated liquid jet. By introducing a parameter K , it is easier to correlate the superheated liquid jet breakup to the bubble number density as Δ f = K ⋅ n . K is related with the superheat degree, Reynolds number, Weber number, and the ratio of liquid to ambient gas viscosities, which has different form at the transition stage (0.2 P a / P s ⩽ 0.3) and the flare flashing stage ( P a / P s ⩽ 0.2), implying different breakup regimes.
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quantitative observation on breakup of superheated liquid jet using transparent slit nozzle
Experimental Thermal and Fluid Science, 2015Co-Authors: Yuyin Zhang, Shiyan Li, Bin Zheng, Jian Wu, Bin XuAbstract:Abstract Flash-boiling atomization is an effective way to enhance fuel jet breakup and evaporation and to improve the quality of fuel spray in an SIDI engine especially at the cold start condition, compared to the conventional high pressure injection. However, what happened inside the nozzle and how it affects the breakup and atomization characteristics of a superheated liquid jet (spray) is still unknown. In this study, a two-dimensional transparent nozzle was developed for quantitatively observing the bubble formation inside the nozzle and liquid jet breakup near the nozzle exit by high-speed microscopic imaging. It was found that the liquid jet breakup characteristics is strongly affected by the number density and size distribution of bubbles inside nozzle. The superheat degree has predominant effect on both characteristics of the jet breakup and the bubble formation. Superheat degree of 30 °C is a critical point at which the bubble formation rate and the atomization characteristics of the superheated jet changes significantly. These results provide insightful information for understanding the breakup mechanism of a superheated liquid jet and modeling a flash boiling spray.
Yuyin Zhang - One of the best experts on this subject based on the ideXlab platform.
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correlation analysis of superheated liquid jet breakup to bubble formation in a transparent slit nozzle
Experimental Thermal and Fluid Science, 2015Co-Authors: Shiyan Li, Yuyin Zhang, Bin XuAbstract:Abstract This investigation is to evaluate and quantify the influence of bubble formation inside the nozzle on breakup characteristics of a superheated liquid jet outside the nozzle. The effect of fuel properties was examined using methanol, ethanol and butanol. A unique optically-transparent slit nozzle with a high-speed micro-imaging system were utilized for quantifying the bubble formation inside and the liquid jet breakup outside the nozzle. Correlation between bubble number density and breakup of superheated liquid jet was obtained for all the fuel. The bubble is demonstrated as the main driving forces enhancing the breakup of superheated liquid jet. By introducing a parameter K , it is easier to correlate the superheated liquid jet breakup to the bubble number density as Δ f = K ⋅ n . K is related with the superheat degree, Reynolds number, Weber number, and the ratio of liquid to ambient gas viscosities, which has different form at the transition stage (0.2 P a / P s ⩽ 0.3) and the flare flashing stage ( P a / P s ⩽ 0.2), implying different breakup regimes.
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quantitative observation on breakup of superheated liquid jet using transparent slit nozzle
Experimental Thermal and Fluid Science, 2015Co-Authors: Yuyin Zhang, Shiyan Li, Bin Zheng, Jian Wu, Bin XuAbstract:Abstract Flash-boiling atomization is an effective way to enhance fuel jet breakup and evaporation and to improve the quality of fuel spray in an SIDI engine especially at the cold start condition, compared to the conventional high pressure injection. However, what happened inside the nozzle and how it affects the breakup and atomization characteristics of a superheated liquid jet (spray) is still unknown. In this study, a two-dimensional transparent nozzle was developed for quantitatively observing the bubble formation inside the nozzle and liquid jet breakup near the nozzle exit by high-speed microscopic imaging. It was found that the liquid jet breakup characteristics is strongly affected by the number density and size distribution of bubbles inside nozzle. The superheat degree has predominant effect on both characteristics of the jet breakup and the bubble formation. Superheat degree of 30 °C is a critical point at which the bubble formation rate and the atomization characteristics of the superheated jet changes significantly. These results provide insightful information for understanding the breakup mechanism of a superheated liquid jet and modeling a flash boiling spray.
Shiyan Li - One of the best experts on this subject based on the ideXlab platform.
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correlation analysis of superheated liquid jet breakup to bubble formation in a transparent slit nozzle
Experimental Thermal and Fluid Science, 2015Co-Authors: Shiyan Li, Yuyin Zhang, Bin XuAbstract:Abstract This investigation is to evaluate and quantify the influence of bubble formation inside the nozzle on breakup characteristics of a superheated liquid jet outside the nozzle. The effect of fuel properties was examined using methanol, ethanol and butanol. A unique optically-transparent slit nozzle with a high-speed micro-imaging system were utilized for quantifying the bubble formation inside and the liquid jet breakup outside the nozzle. Correlation between bubble number density and breakup of superheated liquid jet was obtained for all the fuel. The bubble is demonstrated as the main driving forces enhancing the breakup of superheated liquid jet. By introducing a parameter K , it is easier to correlate the superheated liquid jet breakup to the bubble number density as Δ f = K ⋅ n . K is related with the superheat degree, Reynolds number, Weber number, and the ratio of liquid to ambient gas viscosities, which has different form at the transition stage (0.2 P a / P s ⩽ 0.3) and the flare flashing stage ( P a / P s ⩽ 0.2), implying different breakup regimes.
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quantitative observation on breakup of superheated liquid jet using transparent slit nozzle
Experimental Thermal and Fluid Science, 2015Co-Authors: Yuyin Zhang, Shiyan Li, Bin Zheng, Jian Wu, Bin XuAbstract:Abstract Flash-boiling atomization is an effective way to enhance fuel jet breakup and evaporation and to improve the quality of fuel spray in an SIDI engine especially at the cold start condition, compared to the conventional high pressure injection. However, what happened inside the nozzle and how it affects the breakup and atomization characteristics of a superheated liquid jet (spray) is still unknown. In this study, a two-dimensional transparent nozzle was developed for quantitatively observing the bubble formation inside the nozzle and liquid jet breakup near the nozzle exit by high-speed microscopic imaging. It was found that the liquid jet breakup characteristics is strongly affected by the number density and size distribution of bubbles inside nozzle. The superheat degree has predominant effect on both characteristics of the jet breakup and the bubble formation. Superheat degree of 30 °C is a critical point at which the bubble formation rate and the atomization characteristics of the superheated jet changes significantly. These results provide insightful information for understanding the breakup mechanism of a superheated liquid jet and modeling a flash boiling spray.
Jian Wu - One of the best experts on this subject based on the ideXlab platform.
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quantitative observation on breakup of superheated liquid jet using transparent slit nozzle
Experimental Thermal and Fluid Science, 2015Co-Authors: Yuyin Zhang, Shiyan Li, Bin Zheng, Jian Wu, Bin XuAbstract:Abstract Flash-boiling atomization is an effective way to enhance fuel jet breakup and evaporation and to improve the quality of fuel spray in an SIDI engine especially at the cold start condition, compared to the conventional high pressure injection. However, what happened inside the nozzle and how it affects the breakup and atomization characteristics of a superheated liquid jet (spray) is still unknown. In this study, a two-dimensional transparent nozzle was developed for quantitatively observing the bubble formation inside the nozzle and liquid jet breakup near the nozzle exit by high-speed microscopic imaging. It was found that the liquid jet breakup characteristics is strongly affected by the number density and size distribution of bubbles inside nozzle. The superheat degree has predominant effect on both characteristics of the jet breakup and the bubble formation. Superheat degree of 30 °C is a critical point at which the bubble formation rate and the atomization characteristics of the superheated jet changes significantly. These results provide insightful information for understanding the breakup mechanism of a superheated liquid jet and modeling a flash boiling spray.
Bin Zheng - One of the best experts on this subject based on the ideXlab platform.
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quantitative observation on breakup of superheated liquid jet using transparent slit nozzle
Experimental Thermal and Fluid Science, 2015Co-Authors: Yuyin Zhang, Shiyan Li, Bin Zheng, Jian Wu, Bin XuAbstract:Abstract Flash-boiling atomization is an effective way to enhance fuel jet breakup and evaporation and to improve the quality of fuel spray in an SIDI engine especially at the cold start condition, compared to the conventional high pressure injection. However, what happened inside the nozzle and how it affects the breakup and atomization characteristics of a superheated liquid jet (spray) is still unknown. In this study, a two-dimensional transparent nozzle was developed for quantitatively observing the bubble formation inside the nozzle and liquid jet breakup near the nozzle exit by high-speed microscopic imaging. It was found that the liquid jet breakup characteristics is strongly affected by the number density and size distribution of bubbles inside nozzle. The superheat degree has predominant effect on both characteristics of the jet breakup and the bubble formation. Superheat degree of 30 °C is a critical point at which the bubble formation rate and the atomization characteristics of the superheated jet changes significantly. These results provide insightful information for understanding the breakup mechanism of a superheated liquid jet and modeling a flash boiling spray.