Minimization of two-phase flow frictional pressure drop in small channel with environmentally friendly refrigerant

Accurate prediction of the friction factor and consequently the pressure drop in small two-phase flow channels are still lacking with large disagreements. In addition, the environmental concerns associated with industrial refrigerants currently used have further posed a challenge to find thermally a...

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Main Author:	Yousif, Qais Abid
Format:	Thesis
Language:	English
Published:	2018
Subjects:	TJ Mechanical engineering and machinery
Online Access:	http://eprints.utm.my/id/eprint/79484/1/QaisAbidYousifPFKM2018.pdf
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id	my-utm-ep.79484
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spelling	my-utm-ep.794842018-10-31T12:41:40Z Minimization of two-phase flow frictional pressure drop in small channel with environmentally friendly refrigerant 2018 Yousif, Qais Abid TJ Mechanical engineering and machinery Accurate prediction of the friction factor and consequently the pressure drop in small two-phase flow channels are still lacking with large disagreements. In addition, the environmental concerns associated with industrial refrigerants currently used have further posed a challenge to find thermally and hydrodynamically compatible and environmentally friendly alternatives. The goal of this study is to determine the optimal friction factor and frictional pressure drop using singleobjective and multi-objective genetic algorithms. A total of 53 friction factor models/correlations have been reviewed from which eight were utilized to address discrepancies. Then, minimization of the frictional pressure drop by implementing single-objective genetic algorithm (SOGA) was carried out. In the multi-objective genetic algorithm (MOGA), the conflicting objectives of friction factor and pressure drop have been minimized simultaneously. Finally, the analysis was carried out on a small horizontal tube of 7.6 mm inner diameter utilizing experimental data for the refrigerant R-22 and the natural refrigerant R-290. It has been shown that the disagreements occur due to (i) the use of fluid data from different sources, (ii) utilization of different correlations on viscosity, and consequently on predicting the friction factor, and (iii) the applications of different friction factor correlations on predicting the frictional pressure drop. It has been proven that the Blasius friction factor correlation for turbulent flow in smooth pipe can be used by experimental researchers to determine their frictional pressure drop or/and matching of data and predicted values due to the coincidentally good agreement obtained. The optimal outcomes using MOGA are found to be closest to the experimental data. The percentage difference between the predicted and experimental frictional pressure drop is up to 1.93% and 0.25% when the Blasius friction factor equation is used with the McAdams and Dukler viscosity equations for R-22 and R-290 respectively. 2018 Thesis http://eprints.utm.my/id/eprint/79484/ http://eprints.utm.my/id/eprint/79484/1/QaisAbidYousifPFKM2018.pdf application/pdf en public phd doctoral Universiti Teknologi Malaysia, Faculty of Mechanical Engineering Faculty of Mechanical Engineering
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
language	English
topic	TJ Mechanical engineering and machinery
spellingShingle	TJ Mechanical engineering and machinery Yousif, Qais Abid Minimization of two-phase flow frictional pressure drop in small channel with environmentally friendly refrigerant
description	Accurate prediction of the friction factor and consequently the pressure drop in small two-phase flow channels are still lacking with large disagreements. In addition, the environmental concerns associated with industrial refrigerants currently used have further posed a challenge to find thermally and hydrodynamically compatible and environmentally friendly alternatives. The goal of this study is to determine the optimal friction factor and frictional pressure drop using singleobjective and multi-objective genetic algorithms. A total of 53 friction factor models/correlations have been reviewed from which eight were utilized to address discrepancies. Then, minimization of the frictional pressure drop by implementing single-objective genetic algorithm (SOGA) was carried out. In the multi-objective genetic algorithm (MOGA), the conflicting objectives of friction factor and pressure drop have been minimized simultaneously. Finally, the analysis was carried out on a small horizontal tube of 7.6 mm inner diameter utilizing experimental data for the refrigerant R-22 and the natural refrigerant R-290. It has been shown that the disagreements occur due to (i) the use of fluid data from different sources, (ii) utilization of different correlations on viscosity, and consequently on predicting the friction factor, and (iii) the applications of different friction factor correlations on predicting the frictional pressure drop. It has been proven that the Blasius friction factor correlation for turbulent flow in smooth pipe can be used by experimental researchers to determine their frictional pressure drop or/and matching of data and predicted values due to the coincidentally good agreement obtained. The optimal outcomes using MOGA are found to be closest to the experimental data. The percentage difference between the predicted and experimental frictional pressure drop is up to 1.93% and 0.25% when the Blasius friction factor equation is used with the McAdams and Dukler viscosity equations for R-22 and R-290 respectively.
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Yousif, Qais Abid
author_facet	Yousif, Qais Abid
author_sort	Yousif, Qais Abid
title	Minimization of two-phase flow frictional pressure drop in small channel with environmentally friendly refrigerant
title_short	Minimization of two-phase flow frictional pressure drop in small channel with environmentally friendly refrigerant
title_full	Minimization of two-phase flow frictional pressure drop in small channel with environmentally friendly refrigerant
title_fullStr	Minimization of two-phase flow frictional pressure drop in small channel with environmentally friendly refrigerant
title_full_unstemmed	Minimization of two-phase flow frictional pressure drop in small channel with environmentally friendly refrigerant
title_sort	minimization of two-phase flow frictional pressure drop in small channel with environmentally friendly refrigerant
granting_institution	Universiti Teknologi Malaysia, Faculty of Mechanical Engineering
granting_department	Faculty of Mechanical Engineering
publishDate	2018
url	http://eprints.utm.my/id/eprint/79484/1/QaisAbidYousifPFKM2018.pdf
_version_	1747818237531258880

Minimization of two-phase flow frictional pressure drop in small channel with environmentally friendly refrigerant

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