Abstract
Based on the investigation on the previous studies, correlations for the entrainment and deposition have been changed in the COBRA-TF code in order to improve its predictive capability for the entrainment/deposition phenomenon at low pressures less than 0.5 MPa. As the first step, Sugawara`s correlations for the entrainment and the deposition were introduced into COBRA-TF. The calculational results with these became in much better agreement with the concerned experimental data than before, but the agreement was not yet satisfactory. Then, as the second step, the correlation for the interfacial friction factor was also changed to the Wallis` and this resulted in some more improvement in the calculational results. However, discrepancies between calculated results and the experimental data were still in the range of about 20 %. In order to get a better agreement with the experimental data, a new entrainment correlation has been derived based on the Wuertz`s correlation and the Sugawara`s for modification factors. The new correlation has one more factor than the Sugawara`s and this factor is a function of two Reynolds numbers for the liquid film and the relative motion between the vapor and the liquid film. The calculated results with the new entrainment correlation together with
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Ezzidi, A;
Okubo, Tsutomu;
Murao, Yoshio
[1]
- Japan Atomic Energy Research Inst., Tokai, Ibaraki (Japan). Tokai Research Establishment
Citation Formats
Ezzidi, A, Okubo, Tsutomu, and Murao, Yoshio.
Improvement of COBRA-TF code models for liquid entrainments in film-mist flow.
Japan: N. p.,
1993.
Web.
Ezzidi, A, Okubo, Tsutomu, & Murao, Yoshio.
Improvement of COBRA-TF code models for liquid entrainments in film-mist flow.
Japan.
Ezzidi, A, Okubo, Tsutomu, and Murao, Yoshio.
1993.
"Improvement of COBRA-TF code models for liquid entrainments in film-mist flow."
Japan.
@misc{etde_10120794,
title = {Improvement of COBRA-TF code models for liquid entrainments in film-mist flow}
author = {Ezzidi, A, Okubo, Tsutomu, and Murao, Yoshio}
abstractNote = {Based on the investigation on the previous studies, correlations for the entrainment and deposition have been changed in the COBRA-TF code in order to improve its predictive capability for the entrainment/deposition phenomenon at low pressures less than 0.5 MPa. As the first step, Sugawara`s correlations for the entrainment and the deposition were introduced into COBRA-TF. The calculational results with these became in much better agreement with the concerned experimental data than before, but the agreement was not yet satisfactory. Then, as the second step, the correlation for the interfacial friction factor was also changed to the Wallis` and this resulted in some more improvement in the calculational results. However, discrepancies between calculated results and the experimental data were still in the range of about 20 %. In order to get a better agreement with the experimental data, a new entrainment correlation has been derived based on the Wuertz`s correlation and the Sugawara`s for modification factors. The new correlation has one more factor than the Sugawara`s and this factor is a function of two Reynolds numbers for the liquid film and the relative motion between the vapor and the liquid film. The calculated results with the new entrainment correlation together with the Sugawara`s deposition correlation and the Wallis` interfacial friction factor correlation are in excellent agreement with the experimental data in a wide range of flow conditions, indicating a significant improvement on the predictive capability of COBRA-TF for the entrainment/deposition phenomenon. (author).}
place = {Japan}
year = {1993}
month = {Jul}
}
title = {Improvement of COBRA-TF code models for liquid entrainments in film-mist flow}
author = {Ezzidi, A, Okubo, Tsutomu, and Murao, Yoshio}
abstractNote = {Based on the investigation on the previous studies, correlations for the entrainment and deposition have been changed in the COBRA-TF code in order to improve its predictive capability for the entrainment/deposition phenomenon at low pressures less than 0.5 MPa. As the first step, Sugawara`s correlations for the entrainment and the deposition were introduced into COBRA-TF. The calculational results with these became in much better agreement with the concerned experimental data than before, but the agreement was not yet satisfactory. Then, as the second step, the correlation for the interfacial friction factor was also changed to the Wallis` and this resulted in some more improvement in the calculational results. However, discrepancies between calculated results and the experimental data were still in the range of about 20 %. In order to get a better agreement with the experimental data, a new entrainment correlation has been derived based on the Wuertz`s correlation and the Sugawara`s for modification factors. The new correlation has one more factor than the Sugawara`s and this factor is a function of two Reynolds numbers for the liquid film and the relative motion between the vapor and the liquid film. The calculated results with the new entrainment correlation together with the Sugawara`s deposition correlation and the Wallis` interfacial friction factor correlation are in excellent agreement with the experimental data in a wide range of flow conditions, indicating a significant improvement on the predictive capability of COBRA-TF for the entrainment/deposition phenomenon. (author).}
place = {Japan}
year = {1993}
month = {Jul}
}