Topic
Slug flow
About: Slug flow is a research topic. Over the lifetime, 3758 publications have been published within this topic receiving 71157 citations.
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TL;DR: In this paper, the effects of bubble length, liquid slug length, and gravity on the liquid film thickness were investigated, and experimental correlation for the initial liquid-film thickness based on capillary number, Reynolds number, and Weber number was proposed.
265 citations
TL;DR: A series of equations based on the physical processes thought to take place during slug flow were developed in this paper to predict the hydrodynamic character of this complex flow pattern, which appeared to validate the model.
Abstract: A series of equations are developed based on the physical processes thought to take place during slug flow which are used to predict the hydrodynamic character of this complex flow pattern. New experimental results are reported which appear to validate the model.
262 citations
TL;DR: In this paper, the local instantaneous formulation of the interfacial area concentration is introduced, and time and spatial averaged area concentrations are derived, and the local ergodic theorem is obtained for stationary developed two-phase flow based on the two-fluid model.
260 citations
TL;DR: In this article, a study on boiling heat transfer of refrigerant R-113 in a small-diameter (2.92 mm) tube is reported, where local heat transfer coefficients are measured for a range of heat flux (8.8-90.75 kW/m[sup 2]), mass flux (50-300 kg/m [sup 2]s), and equilibrium mass quality (0-0.9).
Abstract: Results of a study on boiling heat transfer of refrigerant R-113 in a small-diameter (2.92 mm) tube are reported. Local heat transfer coefficients are measured for a range of heat flux (8.8-90.75 kW/m[sup 2]), mass flux (50-300 kg/m[sup 2]s), and equilibrium mass quality (0-0.9). The measured coefficients are used to evaluate 10 different heat transfer correlations, some of which have been developed specifically for refrigerants. High heat fluxes and low mass fluxes are inherent in small channels, and this combination results in high boiling numbers. In addition, based on a flow pattern map developed from adiabatic experiments with air-water mixtures, it has been shown that small-diameter channels produce a slug flow pattern over a large range of parameters when compared with larger-diameter channels. The effects of high boiling number and slug flow pattern lead to domination by a nucleation mechanism. As a result, the two-phase correlations that predicted this dominance also predicted the data the best when they properly modeled the physical parameters. The correlation of Lazarek and Black (1982) predicted the data very well. It is also shown that a simple form, suggested by Stephan and Abdelsalam (1980) for nucleate pool boiling, correlates the data equally well; both correlationsmore » are within a mean deviation of less than 13 percent. Results are applicable to boiling in compact heat exchangers. 28 refs., 11 figs., 3 tabs.« less
254 citations
TL;DR: In this paper, a unified hydrodynamic model is developed for predictions of flow pattern transitions, pressure gradient, liquid holdup and slug characteristics in gas-liquid pipe flow at all inclination angles from -90° to 90° from horizontal.
Abstract: A unified hydrodynamic model is developed for predictions of flow pattern transitions, pressure gradient, liquid holdup and slug characteristics in gas-liquid pipe flow at all inclination angles from -90° to 90° from horizontal. The model is based on the dynamics of slug flow, which shares transition boundaries with all the other flow patterns. By use of the entire film zone as the control volume, the momentum exchange between the slug body and the film zone is introduced into the momentum equations for slug flow. The equations of slug flow are used not only to calculate the slug characteristics, but also to predict transitions from slug flow to other flow patterns. Significant effort has been made to eliminate discontinuities among the closure relationships through careful selection and generalization. The flow pattern classification is also simplified according to the hydrodynamic characteristics of two-phase flow.
248 citations