Heat transfer coefficients of additively manufactured tubes with internal pin fins for supercritical carbon dioxide cycle recuperators

Searle, Matthew; Black, Jim; Straub, Doug; Robey, Ed; Yip, Joe; Ramesh, Sridharan; Roy, Arnab; Sabau, Adrian S.; Mollot, Darren

doi:10.1016/j.applthermaleng.2020.116030

Heat transfer coefficients of additively manufactured tubes with internal pin fins for supercritical carbon dioxide cycle recuperators

Journal Article · Sat Sep 12 00:00:00 EDT 2020 · Applied Thermal Engineering

DOI:https://doi.org/10.1016/j.applthermaleng.2020.116030· OSTI ID:1665990

Searle, Matthew ^[1]; Black, Jim ^[2]; Straub, Doug ^[1]; Robey, Ed ^[3]; Yip, Joe ^[1]; Ramesh, Sridharan ^[3]; Roy, Arnab ^[3]; ^[4]; Mollot, Darren ^[5]

National Energy Technology Lab. (NETL), Morgantown, WV (United States)
National Energy Technology Lab. (NETL), Pittsburgh, PA (United States)
Leidos Research Support Team, Morgantown, WV (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
US Department of Energy (USDOE), Washington DC (United States)

This paper describes the measurement of convective heat transfer coefficients and friction factors for sCO₂ flowing in additively manufactured tubes with internal pin fins at the US DOE’s National Energy Technology Laboratory in Morgantown, WV. Specifically, the measurement procedures were validated by conducting benchmark tests with smooth stainless-steel tube and comparing the results with published correlations for Nusselt number (

Nu

) and friction factor. Over Reynolds numbers (Re_D) ranging from 5 × 10⁴ to 2.5 × 10⁵, measured

Nu

was within 5% of the Dittus-Boelter correlation and measured friction factors were within 5% of the McAdams correlation for smooth tube flow. The candidate pin fin patterned pipes were additively manufactured (AM) at the Oak Ridge National Laboratory. The pins were circular or elliptical in cross-section and were printed at a 30° angle relative to the inner wall (to meet AM constraints). The pin arrangement was helical to promote enhanced heat transfer due to swirl flow. Pin length to diameter aspect ratio was 1.33, 2, and 8, while the pin diameter to tube diameter ratio was 0.188, 0.125, and 0.063. Tests were performed for Re_D varying from 6.9 × 10⁴ to 2.2 × 10⁵ and at conditions equivalent to the low pressure (LP) outlet (8.69 MPa, 361 K) and the high pressure (HP) inlet (20.7 MPa, 350 K) of the low temperature recuperator (LTR) in an indirect sCO₂ cycle. The Wilson plot technique was utilized to measure the bulk heat transfer coefficients.

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Fossil Energy (FE)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1665990

Alternate ID(s):: OSTI ID: 1765710
OSTI ID: 1664452

Journal Information:: Applied Thermal Engineering, Journal Name: Applied Thermal Engineering Vol. 181; ISSN 1359-4311

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Related Subjects

42 ENGINEERING
Additive manufacturing
Enhanced heat transfer
Helical pin fins
Recuperator
Supercritical carbon dioxide

Heat transfer coefficients of additively manufactured tubes with internal pin fins for supercritical carbon dioxide cycle recuperators

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