Title
A Study Of Heat Transfer Augmentation For Recuperative Heat Exchangers: Comparison Between Three Dimple Geometries
Abstract
This study presents an investigation of the heat transfer augmentation for the purpose of obtaining high effectiveness recuperative heat exchangers for regeneration. The focus of the present work is in the fully developed portion of a 2:1 aspect ratio rectangular channel characterized by dimples applied to one wall at channel Reynolds numbers of 10, 000, 18, 000, 27, 000, and 36, 000. The dimples are applied in a staggered-row, racetrack configuration. In this study, a segmented copper test section was embedded with insulated dimples in order to minimize (to a negligible level) the heat transfer within the dimpled feature. The insulated material used to create a dimpled geometry isolates the heat transfer within the dimple cavity from the heat transfer augmentation on the surrounding smooth walls promoted by the flow disturbances induced by the dimple. Results for three different geometries are presented, a small dimple feature, a large dimple, and a double dimple. The results of this study indicate that there is significant heat transfer augmentation even on the non-featured portion of the channel wall. Overall heat transfer augmentations for the small dimples are between 13-27%, large dimples between 33-54%, and double dimples between 22-39%, with highest heat transfer augmentation at the lowest Reynolds number for all three dimple geometries tested. Copyright © 2011 by ASME.
Publication Date
12-1-2011
Publication Title
Proceedings of the ASME Turbo Expo
Volume
3
Number of Pages
939-951
Document Type
Article; Proceedings Paper
Personal Identifier
scopus
DOI Link
https://doi.org/10.1115/GT2011-46401
Copyright Status
Unknown
Socpus ID
84865488834 (Scopus)
Source API URL
https://api.elsevier.com/content/abstract/scopus_id/84865488834
STARS Citation
Valentino, Michelle I.; Tran, Lucky V.; Ricklick, Mark; and Kapat, J. S., "A Study Of Heat Transfer Augmentation For Recuperative Heat Exchangers: Comparison Between Three Dimple Geometries" (2011). Scopus Export 2010-2014. 2173.
https://stars.library.ucf.edu/scopus2010/2173