Heat transfer modeling of non-boiling gas-liquid slug flow using a slug tracking approach

Grigoleto, Mariana M.; Bassani, Carlos L.; Conte, Marco Germano; Cozin, Cristiane; Barbuto, Fausto Arinos; Morales, Rigoberto E. M.

doi:10.1016/j.ijheatmasstransfer.2020.120664

Cited by 8 publications

(7 citation statements)

References 28 publications

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“…Once the entering slug unit has been created, it evolves based on the model for unsteady flow presented here (unsteady approach of first slug unit). An alternative, following [14], is to consider this slug unit as steady until its bubble nose touches the inlet. This can be achieved here by dropping the terms in the equations modeling the rate of change of mass and momentum in the various control volumes.…”

Section: Numerical Aspectsmentioning

confidence: 99%

“…Note that [9] "froze" the attributes of the leading slug unit cell once its slug body front reaches the pipe exit. On the other hand, [14] instantaneously removed the elongated bubble and liquid film following a slug body that has just left the pipe.…”

Section: Numerical Aspectsmentioning

confidence: 99%

“…Here, we focus on the slug tracking. The works that use this approach that are more relevant to us are those by Nydal and Banerjee [11], Al-safran et al [12], Ujang et al [13], Rosa et al [9], and the very recent one by Grigoleto et al [14]. By comparing against experimental data, the performance of the various models is evaluated and regarded as satisfactory, in general.…”

Section: Introductionmentioning

confidence: 99%

“…In [12,13] the steady momentum equations of [2,15] with constant film thickness are used for the liquid film and elongated bubble regions of a slug flow unit and also the steady version of the momentum balance is applied to the slug body or liquid slug. In [9,14], the rate of change of momentum in the slug body -but not in the film or elongated bubble -as well as momentum fluxes are considered. Specifically, in [14], a term accounting for momentum fluxes is included as an additional pressure difference modeling the head loss caused by liquid recirculation in the elongated bubble wake.…”

Section: Introductionmentioning

confidence: 99%

“…In [9,14], the rate of change of momentum in the slug body -but not in the film or elongated bubble -as well as momentum fluxes are considered. Specifically, in [14], a term accounting for momentum fluxes is included as an additional pressure difference modeling the head loss caused by liquid recirculation in the elongated bubble wake.…”

Section: Introductionmentioning

confidence: 99%

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A One-Dimensional Mechanistic Model for Tracking Unsteady Slug Flow

Padrino

Srinil

Kurushina

et al. 2021

Volume 10: Fluids Engineering

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A novel one-dimensional slug tracking mechanistic model for unsteady, upward gas-liquid slug flow in inclined pipes is presented. The model stems from the first principles of mass and momentum conservation applied to a slug unit cell consisting of a slug body of liquid and a region of stratified flow containing an elongated bubble and a liquid film. The slug body front and rear are treated as surfaces of discontinuity where mass and momentum balances or “jump laws” are prescribed. The former is commonly applied in mechanistic models for slug flow, whereas the latter is typically overlooked, thereby leading to the assumption of a continuous pressure profile at these points or to the adoption of a pressure drop due to the fluid acceleration on a heuristic basis. Our analysis shows that this pressure change arises formally from the momentum jump law at the slug body front. The flow is assumed to be isothermal, the gas is compressible, the pressure drop in the elongated bubble region is accounted for, the film thickness is considered uniform, and weight effects in the pressure from the interface level are included. Besides specifying momentum jump laws at both borders of the slug body, another novel feature of the present model is that we avoid adopting the quasi-steady approximation for the elongated bubble-liquid film region, and thus the unsteady terms in the mass and momentum balances are kept. The present model requires empirical correlations for the slug body length and the elongated bubble nose velocity. The non-linear equations are discretized and solved simultaneously for all the slug unit cells filling the pipe. Time-space variation of the slug body and film lengths, liquid holdup and void fraction, and pressures, among other quantities, can be predicted, and model performance is evaluated by comparing with data in the literature.

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Section: Numerical Aspectsmentioning

confidence: 99%

Section: Numerical Aspectsmentioning

confidence: 99%