Investigation of flow non-uniformities in the cross-flow heat exchanger with elliptical tubes

In heat exchangers, especially those with the cross-flow arrangement, it is nearly impossible to achieve the uniform distribution of the working fluid in the tubular space with the currently used inlet and outlet chambers (in some constructions as well). The improper inflow conditions to individual...

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Bibliographic Details
Main Authors: Łopata, Stanisław, Ocłoń, Paweł, Stelmach, Tomasz
Format: Conference Proceeding
Language:English
Subjects:
Cross flow
Flow distribution
Fluid flow
Heat exchangers
Heat transfer
Inflow
Nonuniform flow
Repair & maintenance
Tubes
Working fluids
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Summary:In heat exchangers, especially those with the cross-flow arrangement, it is nearly impossible to achieve the uniform distribution of the working fluid in the tubular space with the currently used inlet and outlet chambers (in some constructions as well). The improper inflow conditions to individual tubes, including those with an elliptical cross-section - often used because of their favorable features compared to round tubes, is the cause of improper heat transfer. In this respect, transitional flow is of particular importance. This flow regime is complex and challenging to model. Therefore, it is necessary to perform experimental verification. For this purpose, an appropriate stand was built, allowing to investigate the flow of the working fluid (water) to the elliptical tubes in the cross-current heat exchanger. The paper presents the results of measurements for manifold geometry, which are currently used in practice (for heat exchanger constructions). The analysis of the measurement data confirms the nonuniform flow distribution to individual tubes of the heat exchanger.
ISSN:2267-1242
2555-0403
2267-1242
DOI:10.1051/e3sconf/201910801009