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- Luo, LeiHarbin Institute of Technology (author)
An experimental investigation on the thermal augmentation of internal endwall in a two-pass duct using an array of delta-winglet vortex generator pair
- Article/chapterEnglish2022
Publisher, publication year, extent ...
- Elsevier BV,2022
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- LIBRIS-ID:oai:lup.lub.lu.se:749f67ae-0e84-4962-a03e-89d652b6e3ff
- https://lup.lub.lu.se/record/749f67ae-0e84-4962-a03e-89d652b6e3ffURI
- https://doi.org/10.1016/j.ijheatmasstransfer.2021.122043DOI
Supplementary language notes
- Language:English
- Summary in:English
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Notes
- The present study experimentally demonstrates a novel design for an internal endwall in a two-pass duct heat exchanger. An array of delta-winglet vortex generator pairs with different aspect ratio, angle of attack, configuration are mounted on the internal endwall in a U duct. Liquid crystal thermalgraphy and static pressure measurements are utilized in this study to evaluate the heat transfer, thermal-hydraulic performance, and pressure drop penalty. The Reynolds number is varied from 10,000 to 20,000. A comparison between the current novel design and traditional enhanced heat transfer turbulators in the open literature is also included. The results show that the endwall heat transfer is enhanced greatly as the longitudinal vortex generator array is located on the endwall. The variation of the attack angle has great influence on the endwall heat transfer, The endwall fitted with turbulators with an aspect ratio (length/height) of 2 and attack angle of 45-deg provides the highest thermal-hydraulic performance with a relatively low pressure drop penalty as long lasting longitudinal vortices might be induced at this attack angle and the heat transfer is observed to be enhanced at the downstream part of the endwall. In addition, for the temperature uniformity on the endwall, the local heat transfer at the upstream part still has the potential to be further improved for all studied cases. The optimal thermalhydraulic performance is increased by more than 24% compared with that on the endwall in the smooth U duct. This novel design presents a rather high overall thermal performance compared with the traditional design in the open literature.
Subject headings and genre
- TEKNIK OCH TEKNOLOGIER Maskinteknik hsv//swe
- ENGINEERING AND TECHNOLOGY Mechanical Engineering hsv//eng
- Endwall heat transfer
- Experiment
- Liquid crystal thermography
- Two-pass duct
- Winglet vortex generators
Added entries (persons, corporate bodies, meetings, titles ...)
- Zhao, ZhiqiHarbin Institute of Technology (author)
- Qiu, DandanHarbin Institute of Technology (author)
- Wang, SongtaoHarbin Institute of Technology (author)
- Wang, ZhongqiHarbin Institute of Technology (author)
- Sundén, BengtLund University,Lunds universitet,Värmeöverföring,Institutionen för energivetenskaper,Institutioner vid LTH,Lunds Tekniska Högskola,LTH profilområde: Nanovetenskap och halvledarteknologi,LTH profilområden,Heat Transfer,Department of Energy Sciences,Departments at LTH,Faculty of Engineering, LTH,LTH Profile Area: Nanoscience and Semiconductor Technology,LTH Profile areas,Faculty of Engineering, LTH(Swepub:lu)vok-bsu (author)
- Harbin Institute of TechnologyVärmeöverföring (creator_code:org_t)
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- In:International Journal of Heat and Mass Transfer: Elsevier BV1820017-9310
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