Pressure Drop and Void Fraction in Horizontal Air–Water Stratified Flows with Smooth Interface at Atmospheric Pressure
This work presents and analyses the results of an experimental activity aimed at the characterization of stratified air–water flow conditions, which have been poorly analyzed in previous studies although they are significant for industrial applications. Tests were performed in a 24 m long, 60 mm inn...
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| Format: | Article |
| Language: | English |
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MDPI AG
2020-06-01
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| Series: | Fluids |
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| Online Access: | https://www.mdpi.com/2311-5521/5/3/101 |
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| author | Igor Matteo Carraretto Luigi Pietro Maria Colombo Damiano Fasani Manfredo Guilizzoni Andrea Lucchini |
| author_facet | Igor Matteo Carraretto Luigi Pietro Maria Colombo Damiano Fasani Manfredo Guilizzoni Andrea Lucchini |
| author_sort | Igor Matteo Carraretto |
| collection | DOAJ |
| description | This work presents and analyses the results of an experimental activity aimed at the characterization of stratified air–water flow conditions, which have been poorly analyzed in previous studies although they are significant for industrial applications. Tests were performed in a 24 m long, 60 mm inner diameter PMMA pipe; the superficial velocities ranged between 0.03 m/s and 0.06 m/s for the water and between 0.41 m/s and 2.31 m/s for air. The pressure gradient along the pipeline was determined and compared to the one obtained implementing two-fluid models available in the literature. Fair agreement with the models was found only at high values of the superficial gas velocities, i.e., above 1.31 m/s. Moreover, the void fraction was measured through a resistive probe and compared with the values predicted by available models. Since none of them was able to satisfactorily predict the void fraction in the whole range of superficial velocities, a drift flux model was successfully implemented. Eventually, with both the measured pressure gradient and the void fraction, a two-fluid model was implemented in order to determine the interfacial shear stress and to compare the outcome with the literature, emphasizing the influence of the operating conditions on the prediction performance. |
| first_indexed | 2024-03-10T18:48:34Z |
| format | Article |
| id | doaj.art-9b5b4441b086482ea37bc21865551bad |
| institution | Directory Open Access Journal |
| issn | 2311-5521 |
| language | English |
| last_indexed | 2024-03-10T18:48:34Z |
| publishDate | 2020-06-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Fluids |
| spelling | doaj.art-9b5b4441b086482ea37bc21865551bad2023-11-20T05:17:57ZengMDPI AGFluids2311-55212020-06-015310110.3390/fluids5030101Pressure Drop and Void Fraction in Horizontal Air–Water Stratified Flows with Smooth Interface at Atmospheric PressureIgor Matteo Carraretto0Luigi Pietro Maria Colombo1Damiano Fasani2Manfredo Guilizzoni3Andrea Lucchini4Department of Energy, Politecnico di Milano, via Lambruschini 4, 20156 Milano, ItalyDepartment of Energy, Politecnico di Milano, via Lambruschini 4, 20156 Milano, ItalyDepartment of Energy, Politecnico di Milano, via Lambruschini 4, 20156 Milano, ItalyDepartment of Energy, Politecnico di Milano, via Lambruschini 4, 20156 Milano, ItalyDepartment of Energy, Politecnico di Milano, via Lambruschini 4, 20156 Milano, ItalyThis work presents and analyses the results of an experimental activity aimed at the characterization of stratified air–water flow conditions, which have been poorly analyzed in previous studies although they are significant for industrial applications. Tests were performed in a 24 m long, 60 mm inner diameter PMMA pipe; the superficial velocities ranged between 0.03 m/s and 0.06 m/s for the water and between 0.41 m/s and 2.31 m/s for air. The pressure gradient along the pipeline was determined and compared to the one obtained implementing two-fluid models available in the literature. Fair agreement with the models was found only at high values of the superficial gas velocities, i.e., above 1.31 m/s. Moreover, the void fraction was measured through a resistive probe and compared with the values predicted by available models. Since none of them was able to satisfactorily predict the void fraction in the whole range of superficial velocities, a drift flux model was successfully implemented. Eventually, with both the measured pressure gradient and the void fraction, a two-fluid model was implemented in order to determine the interfacial shear stress and to compare the outcome with the literature, emphasizing the influence of the operating conditions on the prediction performance.https://www.mdpi.com/2311-5521/5/3/101two-fluid flowpressure dropvoid fraction |
| spellingShingle | Igor Matteo Carraretto Luigi Pietro Maria Colombo Damiano Fasani Manfredo Guilizzoni Andrea Lucchini Pressure Drop and Void Fraction in Horizontal Air–Water Stratified Flows with Smooth Interface at Atmospheric Pressure Fluids two-fluid flow pressure drop void fraction |
| title | Pressure Drop and Void Fraction in Horizontal Air–Water Stratified Flows with Smooth Interface at Atmospheric Pressure |
| title_full | Pressure Drop and Void Fraction in Horizontal Air–Water Stratified Flows with Smooth Interface at Atmospheric Pressure |
| title_fullStr | Pressure Drop and Void Fraction in Horizontal Air–Water Stratified Flows with Smooth Interface at Atmospheric Pressure |
| title_full_unstemmed | Pressure Drop and Void Fraction in Horizontal Air–Water Stratified Flows with Smooth Interface at Atmospheric Pressure |
| title_short | Pressure Drop and Void Fraction in Horizontal Air–Water Stratified Flows with Smooth Interface at Atmospheric Pressure |
| title_sort | pressure drop and void fraction in horizontal air water stratified flows with smooth interface at atmospheric pressure |
| topic | two-fluid flow pressure drop void fraction |
| url | https://www.mdpi.com/2311-5521/5/3/101 |
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