Experimental investigation on dominant waves in upward air-water two-phase flow in churn and annular regime

Dasgupta, Arnab; Chandraker, D. K.; Kshirasagar, Suhasith; Reddy, B. Raghavendra; Rajalakshmi, R.; Nayak, Arun K.; Walker, S.; Vijayan, P.K.; Hewitt, Geoffrey F.

doi:10.1016/j.expthermflusci.2016.10.012

Cited by 52 publications

(7 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The trend is consistent with previous studies [5], and it can better illustrate the effect of system pressure on the thickness of the liquid film at the bottom in the pipeline. The variation of the liquid film thickness with the system pressure under different liquid flow velocity is shown in Figure 6.…”

Section: Average Liquid Film Thickness At the Bottomsupporting

confidence: 92%

“…Presently, the thickness of the liquid film is mostly measured by experiments, mainly by the electrical method [2.3] and the optical method [4,5]. The electrical conductivity method has high precision for the measurement of liquid film thickness, but it ignores the instantaneous information of liquid film fluctuation due to the influence of resolution.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effect of System Pressure on Liquid Film Behavior in Horizontal Annular Flow

Zhao¹,

Zhang²,

Zang³

et al. 2023

Proceedings of the 19th International Flow Measurement Conference 2022 on Flow Measurement - FLOMEKO 2022

View full text Add to dashboard Cite

The measurement of liquid film parameters is of great significance in the momentum transfer and heat transfer characteristics of gas-liquid two-phase in annular flow. The liquid film at the bottom of the horizontal annular flow is the thickest and produces the greatest influence on the nature of the annular flow. In large diameter horizontal pipes, the effect of pressure on liquid film behavior lacks systematic discussion. Therefore, a dynamic measurement system for annular flow liquid film was designed based on near-infrared(NIR) sensing technology to complete the measurement of annular flow liquid film thickness data under five pressures. The average liquid film thickness at the bottom is obtained by variational modal decomposition(VMD) of the time series signal, and the wave velocity parameter is obtained by mutual correlation velocimetry. The article initially discusses the effect of pressure on the average thickness of the bottom liquid film as well as the interfacial wave velocity.

show abstract

Section: Average Liquid Film Thickness At the Bottomsupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Effect of System Pressure on Liquid Film Behavior in Horizontal Annular Flow

Zhao¹,

Zhang²,

Zang³

et al. 2023

Proceedings of the 19th International Flow Measurement Conference 2022 on Flow Measurement - FLOMEKO 2022

View full text Add to dashboard Cite

show abstract

“…At fixed Re sg , the interface roughness rises with an increase in Re sl . At low Re sg and high Re sl , huge waves appear on the interface , resulting in a significant increase in k s . After the occurrence of disturbance waves, the distribution of k s fluctuates to a certain degree.…”

Section: Correlation Of the Interface Roughnessmentioning

confidence: 99%

Interfacial Friction Factor Prediction in Vertical Annular Flow Based on the Interface Roughness

et al. 2018

View full text Add to dashboard Cite

Correlations for the interface roughness are proposed for conditions without or with disturbance waves for vertical annular flow. The decisive role of interface roughness in the interfacial friction factor is specified through a comparison of ten correlations for the interfacial friction factor with an experimental database. The effect of the disturbance wave on the interface roughness is analyzed to figure out the influence parameters, which are the superficial gas and liquid Reynolds numbers for conditions without disturbance waves and gas core and liquid film Reynolds numbers for conditions with disturbance waves. The proposed correlations improve the prediction precision of the interfacial friction factor, especially in smooth and transitional regimes.

show abstract

“…where ǫ is the gas-phase void fraction, ρ * L is the density of water, and ρ * G is the density of air. The image processing technique was used to evaluate the gas-phase void fraction [54,55,56]. Twenty different snapshots were captured from each video at all the flow conditions listed in Table 2.…”

mentioning

confidence: 99%