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<p>In plate-type heat exchangers for automotive applications, flow angles in offset strip fins (OSFs) vary owing to port–fin misalignment, requiring performance evaluation for different flow directions. This study investigates the thermal–hydraulic performance of OSFs for various flow angles, which is evaluated by increasing the flow angle from 0–90°. Three fin geometry parameters and the flow angle are considered. Numerical simulation results validated against the experimental data achieve deviations of ±20 % and ±10 % for the <i>f</i>- and <i>j</i>-factors, respectively, which are used to develop empirical correlations for the flow angle and fin geometry parameters. The proposed correlations show excellent predictive performance, with 92 % and 82 % of the <i>f</i>- and <i>j</i>-factor data, respectively, falling within a ±15 % deviation range. Moreover, an analysis is conducted based on the proposed correlations, which identifies the flow angle and fin height as key parameters influencing the thermal–hydraulic performance of the OSFs.</p>

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Parametric modeling of the thermal-hydraulic performance of offset-strip fins at various flow angles

  • 期刊论文

  • 发表日期：

    2026年4月13日

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  • Hyun Chang Lee,
  • Tae Seung Choi,
  • Taek Keun Kim

摘要

In plate-type heat exchangers for automotive applications, flow angles in offset strip fins (OSFs) vary owing to port–fin misalignment, requiring performance evaluation for different flow directions. This study investigates the thermal–hydraulic performance of OSFs for various flow angles, which is evaluated by increasing the flow angle from 0–90°. Three fin geometry parameters and the flow angle are considered. Numerical simulation results validated against the experimental data achieve deviations of ±20 % and ±10 % for the f- and j-factors, respectively, which are used to develop empirical correlations for the flow angle and fin geometry parameters. The proposed correlations show excellent predictive performance, with 92 % and 82 % of the f- and j-factor data, respectively, falling within a ±15 % deviation range. Moreover, an analysis is conducted based on the proposed correlations, which identifies the flow angle and fin height as key parameters influencing the thermal–hydraulic performance of the OSFs.