Bubble formation from an orifice in liquid cross-flow

Mirsandi, H.; Smit, W.J.; Kong, Gaopan; Baltussen, M.W.; Peters, E.A.J.F.; Kuipers, J.A.M.

doi:10.1016/j.cej.2019.01.181

Cited by 24 publications

(18 citation statements)

References 44 publications

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“…It should be noted here that as the ethanol concentration is increased from 0 wt% to 10 wt%, the surface tension is reduced by 34%, whereas the liquid viscosity is increased by 68%. However, several studies revealed that the influence of liquid viscosity on bubble formation is negligible, especially at low gas flow rates (Kumar and Kuloor 1970;Gerlach et al 2007;Mirsandi et al 2019). The apparent contact angle between the liquid phases and the orifice material for each solution is measured using a DataPhysics OCA-30 contact angle goniometer equipped with a TBU 90E tilting base unit.…”

Section: Methodsmentioning

confidence: 99%

“…2011). All these methods have been used to simulate bubble formation from an orifice (Gerlach et al 2007;Buwa et al 2007;Quan and Hua 2008;Chakraborty et al 2009;Yujie et al 2012;Albadawi et al 2013;Xu et al 2015;Mirsandi et al 2018Mirsandi et al , 2019Kong et al 2019). However, only a few numerical studies have taken into account the influence of the moving contact line (Kandlikar and Steinke 2002;Gerlach et al 2007;Buwa et al 2007;Chen et al 2013) and the majority of them assumed a constant contact angle.…”

Section: Introductionmentioning

confidence: 99%

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Influence of wetting conditions on bubble formation from a submerged orifice

et al. 2020

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The formation of gas bubbles by submerged orifices is a fundamental process encountered in various industrial applications. The dynamics of the contact line and the contact angle may have a significant influence on the detached bubble size depending on the wettability of the system. In this study, the influence of wetting conditions on the dynamics of bubble formation from a submerged orifice is investigated experimentally and numerically. The experiments are performed using a hydrophobic orifice plate and a series of ethanol-water solutions to vary the wettability where the key characteristics of the bubbles are measured using a high-speed, high-resolution camera. An extensive analysis on the influence of wetting conditions on the bubble size, bubble growth mechanism and the behavior of the contact line is given. Bubble growth stages, termed (1) hemispherical spreading, (2) cylindrical spreading, (3) critical growth and (4) necking, are identified based on key geometrical parameters of the bubble and relevant forces acting on the bubble during the growth. The experimental results show that the apparent contact angle varies in a complicated manner as the bubble grows due to the surface roughness and heterogeneity. The experimental findings are finally used to validate the local front reconstruction method with a contact angle model to account for the contact angle hysteresis observed in the experiments.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence of wetting conditions on bubble formation from a submerged orifice

et al. 2020

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“…The numerical model used in the present work is based on the Local Front Reconstruction Method (LFRM), originally developed by Shin et al (2011) and adjusted by Mirsandi et al (2018Mirsandi et al ( , 2019. In the sections below, the main characteristics of the numerical model are described.…”

Section: Numerical Modelmentioning

confidence: 99%

Oscillation dynamics of a bubble rising in viscous liquid

et al. 2019

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In the present work, we study the oscillation dynamics of 3 mm-diameter bubbles generated through an orifice submerged in viscous liquids. The viscosity of those liquids is varied to change the behavior of the rising bubble. The details of the rising motion and shape oscillation of the bubbles are measured using a combination of high speed, high-resolution imaging, and an accurate digital image processing technique. Direct Numerical Simulations that mimic the experimental conditions are also performed using a front-tracking technique, called the Local Front Reconstruction Method. The predictions of the bubble shape and rising velocity obtained by the numerical simulations show good agreement with the experimental results. Our experimental and numerical results show that the oscillation frequency and the damping rate at lower modes can be predicted using available theoretical models found in the literature. However, discrepancies arise between our results with the theoretical predictions at higher order oscillation modes. We conclude that the discrepancies are due to the influence of rising motion and the vortex wave, which is not considered in the theoretical models.

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“…The variation of the liquid-fraction with different numbers of cells are presented in Figure 3 a. As shown, the results for all grid resolutions are identical with the maximum difference of less than 1.5% [ 66 ]. Therefore, the mesh with the cell number of 172,016 is sufficient for the modelling.…”

Section: Numerical Modelling and Validationmentioning

confidence: 99%

Phase Change Process in a Zigzag Plate Latent Heat Storage System during Melting and Solidification

et al. 2020

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Applying a well-performing heat exchanger is an efficient way to fortify the relatively low thermal response of phase-change materials (PCMs), which have broad application prospects in the fields of thermal management and energy storage. In this study, an improved PCM melting and solidification in corrugated (zigzag) plate heat exchanger are numerically examined compared with smooth (flat) plate heat exchanger in both horizontal and vertical positions. The effects of the channel width (0.5 W, W, and 2 W) and the airflow temperature (318 K, 323 K, and 328 K) are exclusively studied and reported. The results reveal the much better performance of the horizontal corrugated configuration compared with the smooth channel during both melting and solidification modes. It is found that the melting rate is about 8% faster, and the average temperature is 4 K higher in the corrugated region compared with the smooth region because of the large heat-exchange surface area, which facilitates higher rates of heat transfer into the PCM channel. In addition to the higher performance, a more compact unit can be achieved using the corrugated system. Moreover, applying the half-width PCM channel accelerates the melting rate by eight times compared to the double-width channel. Meanwhile, applying thicker channels provides faster solidification rates. The melting rate is proportional to the airflow temperature. The PCM melts within 274 s when the airflow temperature is 328 K. However, the melting time increases to 460 s for the airflow temperature of 308 K. Moreover, the PCM solidifies in 250 s and 405 s in the cases of 318 K and 328 K airflow temperatures, respectively.

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Bubble formation from an orifice in liquid cross-flow

Cited by 24 publications

References 44 publications

Influence of wetting conditions on bubble formation from a submerged orifice

Influence of wetting conditions on bubble formation from a submerged orifice

Oscillation dynamics of a bubble rising in viscous liquid

Phase Change Process in a Zigzag Plate Latent Heat Storage System during Melting and Solidification

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