A New Technique to Separately Evaluate the Ffects of Surace Tension and Viscosity on Rupture of a Bubble at Water Surface

Nabesaka, Seishi; Eton, T. Goji; Takehara, Kohsei

doi:10.2208/jscej.2002.705_19

Cited by 4 publications

References 7 publications

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Development of a Flow Visualization Borescope and a Two-Phase Flow Probe for Aeroengine Transmission Gears

Arisawa

Shinoda

Noguchi

et al. 2019

Journal of Engineering for Gas Turbines and Power

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To reduce power losses due to oil flows in aeroengine gearboxes, the oil flows should be visualized and measured. In this study, we develop a flow visualization borescope that qualitatively visualizes oil flows along with a two-phase flow probe that quantitatively measures the oil/air ratio and flow velocity. The flow visualization borescope comprises a 16-mm-diameter pipe. Within the pipe, an air purge passage for removing oil mist and a borescope are integrated with an illumination laser and optical lenses, enabling clear, high-speed photography. The two-phase probe consists of a 5-mm-diameter pipe with a 1-mm-diameter measurement hole and an internal pressure adjustment pipe. The borescope and flow probe were demonstrated using a shrouded spur gear with a peripheral speed of 100 m/s and oil supply of 20 l/min. Flow visualization at 30,000 fps revealed that oil outflow from the shroud opening spreads turbulently over the entire width of the opening. Measurements of the oil/air ratio and flow velocity using the two-phase flow probe revealed a thin oil-rich layer on the shroud wall and showed that the flow speed is lower than the gear peripheral speed. The measurement equipment used herein would be easy to install in a gearbox and is therefore expected to be applied in actual aeroengine gearboxes.

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Development of a Flow Visualization Borescope and a Two-Phase Flow Probe for Aeroengine Transmission Gears

Arisawa

Shinoda

Noguchi

et al. 2019

Journal of Engineering for Gas Turbines and Power

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show abstract

Developments of a Flow Visualization Borescope and a Two-Phase Flow Probe for Aeroengine Transmission Gears

Arisawa

Shinoda

Noguchi

et al. 2018

Volume 1: Aircraft Engine; Fans and Blowers; Marine

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In order to reduce oil dynamic power loss in aeroengine gearboxes, visualizations and measurements of the oil-flow are effective. In the research presented in this paper, we developed a flow visualization borescope which can qualitatively visualize oil flow and a two-phase flow probe which can quantitatively measure oil/air ratio and the flow velocity. The flow visualization borescope consists of a 16mm diameter pipe in which an air purge passage for removing oil mist and a borescope are integrated with an illumination laser light and optical lenses, enabling clear high-speed photography. The two-phase probe consists of a 5mm diameter pipe with a 1mm diameter measurement hole and has a pressure adjustment pipe inside the pipe. For a demonstration, a shrouded spur gear with 100 m/s peripheral speed and 20 liters/min oil supply was used. Flow visualization at 30000 frame/sec imaging shows that oil outflow from the shroud opening spreads turbulently over the whole width of the opening. Oil/air ratio and flow velocity measurement by the two-phase flow probe show that there was thin oil-rich layer on the shroud wall and the flow speed was slow compared with the gear peripheral speed. The measurement equipment we developed was easily installed to the gearbox and therefore it is expected to apply to real aeroengine gearboxes.

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Study on numerical simulation for rupture of bubble at water surface by Level Set method

Asai¹,

Tsubogo²

2004

Environmental Hydraulics and Sustainable Water Management, Two Volume Set

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A New Technique to Separately Evaluate the Ffects of Surace Tension and Viscosity on Rupture of a Bubble at Water Surface

Cited by 4 publications

References 7 publications

Development of a Flow Visualization Borescope and a Two-Phase Flow Probe for Aeroengine Transmission Gears

Development of a Flow Visualization Borescope and a Two-Phase Flow Probe for Aeroengine Transmission Gears

Developments of a Flow Visualization Borescope and a Two-Phase Flow Probe for Aeroengine Transmission Gears

Study on numerical simulation for rupture of bubble at water surface by Level Set method

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