Using froude and weber numbers to represent the changes in the flow pattern from stratified to stratified-wavy or plug for wire-on-tube condenser
According to manufacturing data, a theoretical study of condensation inside a heat exchanger with wires on tubes.examined flow patterns with variable refrigerant mass flow rates. Wire-on-tube condensers are adopted with tubes, which have multiple diameters (3.25, 4.83 and 6.29 mm). In addition to th...
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2024-12-01
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| author | Louay A.Al-Azez Mahdi Hasanain A. Abdul Wahhab Miqdam T. Chaichan |
| author_facet | Louay A.Al-Azez Mahdi Hasanain A. Abdul Wahhab Miqdam T. Chaichan |
| author_sort | Louay A.Al-Azez Mahdi |
| collection | DOAJ |
| description | According to manufacturing data, a theoretical study of condensation inside a heat exchanger with wires on tubes.examined flow patterns with variable refrigerant mass flow rates. Wire-on-tube condensers are adopted with tubes, which have multiple diameters (3.25, 4.83 and 6.29 mm). In addition to the use of two refrigerants (R-134a, R-600a) working at condensing temperatures of (54.4, 45, and 35 °C). The Equal Equation Solver software (EES) was used to obtain the results for the mass velocity range from 8 to 167 kg s−1m−2. Using the non-dimensionless numbers, the model determines the refrigerant flow pattern. Weber number (We) and Froude number (Fr) were used for mass velocity in a range below 100 kg s−1 m−2, which is recommended flow inside the wire-on-tube condenser. The initial transition of the two-phase flow pattern from stratified to stratified-wavy occurred at beginning of condensation for the quality range (0.78-0.42) was Fr (2.7-2.0) and We (6.1-4.0) for R-134a, while the quality range (0.85-0.39) was Fr (5.0-2.4) and We (7.0-4) for R-600a. Second, as the quality range approached, the stratified-wavy flow was replaced by a plug at quality (0.23-0.06) were Fr (1.5-0.4) and We (3.8-2.1) for R-134a and for R-600a the quality range (0.22-0.05) were Fr (1.7-0.55) and We (3.7-2.2). |
| format | Article |
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| institution | OA Journals |
| issn | 2590-1230 |
| language | English |
| publishDate | 2024-12-01 |
| publisher | Elsevier |
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| series | Results in Engineering |
| spelling | doaj-art-8722dbe774d64bf183e0932b3d96fe1c2025-08-20T01:58:31ZengElsevierResults in Engineering2590-12302024-12-012410300110.1016/j.rineng.2024.103001Using froude and weber numbers to represent the changes in the flow pattern from stratified to stratified-wavy or plug for wire-on-tube condenserLouay A.Al-Azez Mahdi0Hasanain A. Abdul Wahhab1Miqdam T. Chaichan2Energy and Renewable Energies Technology Centre, University of Technology- Iraq, Baghdad 35050, IraqTraining and Workshop Centre, University of Technology-Iraq, Baghdad 35050, Iraq; Corresponding author.Energy and Renewable Energies Technology Centre, University of Technology- Iraq, Baghdad 35050, IraqAccording to manufacturing data, a theoretical study of condensation inside a heat exchanger with wires on tubes.examined flow patterns with variable refrigerant mass flow rates. Wire-on-tube condensers are adopted with tubes, which have multiple diameters (3.25, 4.83 and 6.29 mm). In addition to the use of two refrigerants (R-134a, R-600a) working at condensing temperatures of (54.4, 45, and 35 °C). The Equal Equation Solver software (EES) was used to obtain the results for the mass velocity range from 8 to 167 kg s−1m−2. Using the non-dimensionless numbers, the model determines the refrigerant flow pattern. Weber number (We) and Froude number (Fr) were used for mass velocity in a range below 100 kg s−1 m−2, which is recommended flow inside the wire-on-tube condenser. The initial transition of the two-phase flow pattern from stratified to stratified-wavy occurred at beginning of condensation for the quality range (0.78-0.42) was Fr (2.7-2.0) and We (6.1-4.0) for R-134a, while the quality range (0.85-0.39) was Fr (5.0-2.4) and We (7.0-4) for R-600a. Second, as the quality range approached, the stratified-wavy flow was replaced by a plug at quality (0.23-0.06) were Fr (1.5-0.4) and We (3.8-2.1) for R-134a and for R-600a the quality range (0.22-0.05) were Fr (1.7-0.55) and We (3.7-2.2).http://www.sciencedirect.com/science/article/pii/S2590123024012568Wire on tube condenserR-134aR-600aFroude numberWeber numberStratified |
| spellingShingle | Louay A.Al-Azez Mahdi Hasanain A. Abdul Wahhab Miqdam T. Chaichan Using froude and weber numbers to represent the changes in the flow pattern from stratified to stratified-wavy or plug for wire-on-tube condenser Results in Engineering Wire on tube condenser R-134a R-600a Froude number Weber number Stratified |
| title | Using froude and weber numbers to represent the changes in the flow pattern from stratified to stratified-wavy or plug for wire-on-tube condenser |
| title_full | Using froude and weber numbers to represent the changes in the flow pattern from stratified to stratified-wavy or plug for wire-on-tube condenser |
| title_fullStr | Using froude and weber numbers to represent the changes in the flow pattern from stratified to stratified-wavy or plug for wire-on-tube condenser |
| title_full_unstemmed | Using froude and weber numbers to represent the changes in the flow pattern from stratified to stratified-wavy or plug for wire-on-tube condenser |
| title_short | Using froude and weber numbers to represent the changes in the flow pattern from stratified to stratified-wavy or plug for wire-on-tube condenser |
| title_sort | using froude and weber numbers to represent the changes in the flow pattern from stratified to stratified wavy or plug for wire on tube condenser |
| topic | Wire on tube condenser R-134a R-600a Froude number Weber number Stratified |
| url | http://www.sciencedirect.com/science/article/pii/S2590123024012568 |
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