Optimal design of the semi-dimple vortex generator in the fin and tube heat exchanger

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Publication Details

Author list: Chimres N., Wang C.-C., Wongwises S.

Publisher: Elsevier

Publication year: 2018

Journal: International Journal of Heat and Mass Transfer (0017-9310)

Volume number: 120

Start page: 1173

End page: 1186

Number of pages: 14

ISSN: 0017-9310

eISSN: 1879-2189

URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85039698198&doi=10.1016%2fj.ijheatmasstransfer.2017.11.121&partnerID=40&md5=12147281419d6c1b1980084aa4cd7af2

Languages: English-Great Britain (EN-GB)

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Abstract

The fin and tube heat exchanger with a semi-dimple pair is numerically studied in terms of the air side's thermal performance. The investigated parameters consist of the diameter, attack angle and the placed location of the semi-dimple. The results show that the 30° attack angle, 5.5 mm vertical distance and 7.5 mm horizontal distance can perform the highest j/f ratio or “goodness parameter” of every semi-dimple's diameter. Additionally, the thermal performance of the fin with a semi-dimple pair is also compared with that of the fin with existing semi-dimples and the plain fin within the Reynolds number ranging from 813 to 4019. Obviously, the existing semi-dimple exhibits the highest heat transfer coefficient and pressure drop. However, the semi-dimples’ pair demonstrates a goodness factor of 33–37% greater than the existing semi-dimples and 15–20% greater than the plain fin, approximately. © 2017

Keywords

Fin and tube heat exchanger, Semi dimple