Liquid hold-up, pressure gradient, and flow patterns in inclined gas-liquid pipe flow
| Autor: | J.M.H. Fortuin, Eric Grolman |
|---|---|
| Přispěvatelé: | CC overig (HIMS, FNWI) |
| Rok vydání: | 1997 |
| Předmět: |
Fluid Flow and Transfer Processes
Pressure drop Materials science Mechanical Engineering General Chemical Engineering Flow (psychology) Aerospace Engineering Mechanics Mars Exploration Program Critical value Pipe flow Physics::Fluid Dynamics Nuclear Energy and Engineering Two-phase flow Pressure gradient Dimensionless quantity |
| Zdroj: | Experimental Thermal and Fluid Science, 15, 174-182. Elsevier |
| ISSN: | 0894-1777 |
| DOI: | 10.1016/s0894-1777(97)00021-6 |
| Popis: | A model is presented for gas-liquid flow and for the stratified-wavy-to-intermittent (slug or semislug) flow-pattern transition in slightly inclined pipes. The main parameter for predicting instabilities in stratified-wavy flow is the liquid hold-up, which attains a maximum, critical value at the flow-pattern transition. The critical liquid hold-up ϵ L, SW-I ranged from 0.07 to 0.42 in the experiments and is presented as a function of the dimensionless superficial gas velocity u GS / u G0 . It is used successfully to model the results of 1270 flow-pattern-transition experiments, performed in pipes of 26 and 51-mm diameter, at inclination angles β between 0.1° and 6.0°, using atmospheric air-water and air-tetradecane systems. For calculating the liquid hold-up in the approach to the flow-pattern transition, which is required to predict the flow pattern, the modified apparent rough surface (MARS) model is presented. The MARS model contains separate equations for the interfacial, gas-to-wall, and liquid-to-wall shear stresses and for each of the three corresponding perimeters. Comparison plots show that liquid hold-ups, pressure gradients, flow-pattern boundaries, and dimensionless liquid-to-wall perimeters calculated with the MARS model agree well with their measured counterparts. |
| Databáze: | OpenAIRE |
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