How do the liquid properties affect the entrapment of bubbles in gas sheared liquid flows?

Sinha, Avick; Cherdantsev, Andrey V.; Johnson, Kathy; Vasques, Joao; Hann, David

doi:10.1016/j.ijheatfluidflow.2021.108878

Cited by 7 publications

(2 citation statements)

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“…As expected from other multi-phase flow applications [6,15] it is observed from Fig. 6a, that with an increase in Re ω the film thickness at both P2 and P4 reduces.…”

Section: Characterization Of the Flow Based On Oil Film-thicknesssupporting

confidence: 84%

“…The probability of ligament and droplet shedding from the oil film when it interacts with rotational air will be higher for shorter wave-length as compared to longer wave-length. These ligaments and droplets will impinge on the oil film resulting in the formation of bubbles [15], and consequently, will affect the heat transfer phenomenon of the oil.…”

Section: Characterization Of the Flow Based On Film Interfacementioning

confidence: 99%

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How Do Interfacial Shear and Gravity Affect the Oil Film Characteristics Near an Aero-Engine Bearing?

Sinha

Brewster

Johnson

et al. 2022

Journal of Engineering for Gas Turbines and Power

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Recent demand for reducing carbon emission and for increasing engine efficiency has led aero- engine manufacturers to strive for a better oil flow system. Aero-engine bearing chambers that house the shaft-support bearings are among the most challenging part of the engine systems and it is imperative to have a proper understanding of the oil flow characteristics inside a bearing chamber to increase the engine efficiency. The present work is focused on experimentally investigating the oil film characteristics near a ball bearing static in the co-and counter- current regions at various rotational Reynolds number (Reω) of the shaft speed, loads and liquid flow rates. The experimental investigation has been carried out over a wide range of engine relevant Reω up to 1.7 × 106 using high-speed imaging and a long distance microscope. The results show that formation of the oil film on the static elements of the bearing is governed by both gravity and interfacial forces at low Reω but only governed by interfacial forces at high Reω. The non-dimensional film thickness ranged from 0.71 to 0.18 and decreases with increasing Reω. A regime map was obtained based on the waviness of the film interface showing three different types of wave. At all conditions investigated all waves were capillary waves. Reω, oil flow rate and gravity was found to have a significant effect on the film thickness (d) with transitions matching the wave regime map.

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“…As expected from other multi-phase flow applications [6,15] it is observed from Fig. 6a, that with an increase in Re ω the film thickness at both P2 and P4 reduces.…”

Section: Characterization Of the Flow Based On Oil Film-thicknesssupporting

confidence: 84%

Section: Characterization Of the Flow Based On Film Interfacementioning

confidence: 99%