On gas-liquid intermittent flow in a horizontal pipe: Influence of sub-regime on slug frequency

Onset of intermittent flow: Visualization of flow structures

“…The experiments were carried out on the same experimental device described by our previous works [13,14]. Figure 1 shows the schematic of the device composed of a 30 mm ID and 13 m long pipe, made entirely of transparent acrylic resin to allow flow visualization.…”

“…The interface of liquid slugs and gas pockets can exhibit various shapes, and liquid slugs can display different levels of aerations, resulting in several types of intermittent flows, called sub-regimes. Intermittent flows have been classified in three sub-regimes: Plug flow, Less Aerated Slug flow (LAS flow) and Highly Aerated Slug flow (HAS flow) [10][11][12][13]. The hydrodynamic behavior of each sub-regime is different [11,13] and requires to be modeled separately.…”

“…Intermittent flows have been classified in three sub-regimes: Plug flow, Less Aerated Slug flow (LAS flow) and Highly Aerated Slug flow (HAS flow) [10][11][12][13]. The hydrodynamic behavior of each sub-regime is different [11,13] and requires to be modeled separately. The distinction between the different sub-regimes has been often ignored and was referred to, in some cases, as slug flow [13], leading then to a less rigorous approach of the phenomena.…”

“…The hydrodynamic behavior of each sub-regime is different [11,13] and requires to be modeled separately. The distinction between the different sub-regimes has been often ignored and was referred to, in some cases, as slug flow [13], leading then to a less rigorous approach of the phenomena.…”

“…The slug frequency (f s ), defined as the number of slugs passing over a period of time, is an important parameter for industrials. Various models have been developed for its estimation [13]. Taitel and Dukler [17] explained that slug frequency is the inverse of the time for a slug to form.…”