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|Type:||Artigo de periódico|
|Title:||Simple Model For Pressure Drop In Horizontal Core Annular Flow|
|Abstract:||Based upon experimental data for heavy oil-water flow inside steel (26.7 mm ID) and cemented (23.9 mm ID) horizontal tubes, a very simple model for pressure drop in the core annular flow pattern was developed. The experiments were run at room temperature and the fluids used were a fuel oil (μ = 2.7 Pa.s, ρ = 989 kg/m3) and tap water, both drawn from a separator tank. First, it is shown that for both tubes the so-called 'perfect core annular flow' approach (shortly PCAF) poorly correlates the data. This is due to the waviness of the interface and turbulence in the annulus flow. These effects are taken into account in the model proposed in this paper and justify the assumption of no-slip, which was earlier concluded by the author from wavespeed measurements for the same flow (Bannwart, 1998). As a result, a very simple correlation model for the pressure gradient is derived. The model was adjusted to fit the data and generalized to other tube sizes and fluids. Different correlations for oleophilic and oleophobic pipe walls are provided. Calculations using the correlation for oleophobic pipe behavior are in very good agreement with data from another source.|
|Editor:||Braz Soc Mech Sci, Rio de Janeiro, Brazil|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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