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Analysis of Flow Maldistribution in Compact Heat Exchangers.

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Title: Analysis of Flow Maldistribution in Compact Heat Exchangers.
Authors: Strobel, M.1 matheus.strobel@t2f.ufsc.br, Mortean, M. V. V.1 marcus.mortean@ufsc.br
Source: Journal of Fluids Engineering. Dec2022, Vol. 144 Issue 12, p1-9. 9p.
Subjects: Heat exchangers, Pressure drop (Fluid dynamics), Compressed air, Atmospheric temperature, Standard deviations
Abstract: Most theoretical models related to thermal performance and the evaluation of pressure drop on compact heat exchangers, consider that the mass flow rate is constant and equal in all core channels. However, this hypothesis in some situations is erroneous, the effect of fluid maldistribution affects heat exchangers performance. Therefore, in the present work, an analysis of the phenomenon of fluid maldistribution in headers was performed. Experimental tests were carried out on polymeric headers, using Polyamide 2200, in order to evaluate the fluid nonuniformity. The tests were carried out with compressed air at room temperature in a wide range of mass flow rate totaling 300 experimental data. A theoretical model was used to predict the fluid maldistribution level inside the header. Based on the coefficient of variation (CoV), the presence of fluid maldistribution for low flows was verified. Besides, a new theoretical model, the standard deviation of fluid nonuniformity (⁠σ ⁠), based on the shape factor (SF), was presented to measure maldistribution level without experimental tests. The proposed model proved to be efficient to predict the fluid nonuniformity inside the header, presenting an average error of 18% in comparison to the CoV. [ABSTRACT FROM AUTHOR]
Copyright of Journal of Fluids Engineering is the property of American Society of Mechanical Engineers and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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  Data: Analysis of Flow Maldistribution in Compact Heat Exchangers.
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Fluids+Engineering%22">Journal of Fluids Engineering</searchLink>. Dec2022, Vol. 144 Issue 12, p1-9. 9p.
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  Data: <searchLink fieldCode="DE" term="%22Heat+exchangers%22">Heat exchangers</searchLink><br /><searchLink fieldCode="DE" term="%22Pressure+drop+%28Fluid+dynamics%29%22">Pressure drop (Fluid dynamics)</searchLink><br /><searchLink fieldCode="DE" term="%22Compressed+air%22">Compressed air</searchLink><br /><searchLink fieldCode="DE" term="%22Atmospheric+temperature%22">Atmospheric temperature</searchLink><br /><searchLink fieldCode="DE" term="%22Standard+deviations%22">Standard deviations</searchLink>
– Name: Abstract
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  Data: Most theoretical models related to thermal performance and the evaluation of pressure drop on compact heat exchangers, consider that the mass flow rate is constant and equal in all core channels. However, this hypothesis in some situations is erroneous, the effect of fluid maldistribution affects heat exchangers performance. Therefore, in the present work, an analysis of the phenomenon of fluid maldistribution in headers was performed. Experimental tests were carried out on polymeric headers, using Polyamide 2200, in order to evaluate the fluid nonuniformity. The tests were carried out with compressed air at room temperature in a wide range of mass flow rate totaling 300 experimental data. A theoretical model was used to predict the fluid maldistribution level inside the header. Based on the coefficient of variation (CoV), the presence of fluid maldistribution for low flows was verified. Besides, a new theoretical model, the standard deviation of fluid nonuniformity (⁠σ ⁠), based on the shape factor (SF), was presented to measure maldistribution level without experimental tests. The proposed model proved to be efficient to predict the fluid nonuniformity inside the header, presenting an average error of 18% in comparison to the CoV. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Journal of Fluids Engineering is the property of American Society of Mechanical Engineers and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1115/1.4054917
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      – Code: eng
        Text: English
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        PageCount: 9
        StartPage: 1
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      – SubjectFull: Heat exchangers
        Type: general
      – SubjectFull: Pressure drop (Fluid dynamics)
        Type: general
      – SubjectFull: Compressed air
        Type: general
      – SubjectFull: Atmospheric temperature
        Type: general
      – SubjectFull: Standard deviations
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      – TitleFull: Analysis of Flow Maldistribution in Compact Heat Exchangers.
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            NameFull: Strobel, M.
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              M: 12
              Text: Dec2022
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              Y: 2022
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