A NEW TYPE OF FIN AND CORRELATIONS FOR PLATE-FIN HEAT EXCHANGERS : NUMERICAL INVESTIGATION OF TRIANGULAR PERFORATED OFFSET-STRIP FINS
JOURNAL OF ENHANCED HEAT TRANSFER, cilt.32, sa.4, ss.75-97, 2025 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 32 Sayı: 4
- Basım Tarihi: 2025
- Doi Numarası: 10.1615/jenhheattransf.2025055951
- Dergi Adı: JOURNAL OF ENHANCED HEAT TRANSFER
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Compendex, INSPEC
- Sayfa Sayıları: ss.75-97
- Gazi Üniversitesi Adresli: Evet
Özet
The increased demand for energy prompted heat exchanger designers to develop more efficient fin surfaces. Traditional fin surfaces of plate fin heat exchangers yield a high thermal and hydraulic per-formance, whereas can be improved by considering additional modifications on the fin structures. Therefore, in this study, full-sized Plate-Fin Heat Exchangers (PFHE) with various fin types, were analyzed numerically. Full-sized analyses demonstrated that perforated offset-strip fins offer superior thermal and hydraulic performance. Consequently, correlations for the Colburn factor and Fanning friction factor for these fins have been proposed. To support the single fin analyses, a simplified model which has experimental data from the literature have been studied. The fin named 1/8 15.61 has been chosen to validate the simplified model. Afterwards, a parametric CFD study has been conducted, considering fin heights (H) of 9-18 mm, fin widths (W) of 3-9 mm, hole diameters (d) of 7 and 12 mm, fin thickness (t) of 0.1 mm, fin lengths (Lt) of 50 and 100 mm, and Reynolds numbers of 1000-5000. CFD analyses for single fins have been performed and the variation of the Colburn factor and Fanning friction factor concerning fin parameters and Reynolds numbers have been presented. The correlations have been derived using non-linear regression analysis. The Colburn factor correlations indicated that the for a given fin height (H), increasing the hole diameter increases the Colburn factor, which can be utilized by heat exchanger designers to determine the thermal and hydraulic characteristics of PFHE.