TY - JOUR

T1 - Experimental investigation of additively manufactured high-temperature heat exchangers

AU - Fuchs, Marco

AU - Bodemer, Julian

AU - Kabelac, Stephan

N1 - Funding Information: The authors would like to express their gratitude to the Federal Ministry for Economic Affairs and Climate Action (BMWK) based on a resolution of the German Bundestag and AiF Projekt GmbH , grant number “ KK5174901SN0 ” for supporting this research.

PY - 2024/1

Y1 - 2024/1

N2 - This article examines various additively manufactured heat exchangers for high-temperature applications. The heat exchangers differ in terms of their internal fin structure as well as optimizations in terms of manufacturing quality. Starting from a reference fin type, optimizations with focus on low pressure drop and high heat transfer are performed. The heat exchangers are investigated experimentally, focusing on the laminar flow regime between 60<Re<600. By means of a presented evaluation algorithm, the Nusselt numbers for the different fin types and designs are determined. The investigations show that even the smallest manufacturing deviations result in up to 70–120% higher f-factors and up to 30% higher Nu numbers. Taking these manufacturing deviations into account in the design process leads to very good agreement with the numerically determined values and the influence of surface roughness is comparatively small. Furthermore, the influence of internal heat radiation is of minor importance for the heat exchangers considered here.

AB - This article examines various additively manufactured heat exchangers for high-temperature applications. The heat exchangers differ in terms of their internal fin structure as well as optimizations in terms of manufacturing quality. Starting from a reference fin type, optimizations with focus on low pressure drop and high heat transfer are performed. The heat exchangers are investigated experimentally, focusing on the laminar flow regime between 60<Re<600. By means of a presented evaluation algorithm, the Nusselt numbers for the different fin types and designs are determined. The investigations show that even the smallest manufacturing deviations result in up to 70–120% higher f-factors and up to 30% higher Nu numbers. Taking these manufacturing deviations into account in the design process leads to very good agreement with the numerically determined values and the influence of surface roughness is comparatively small. Furthermore, the influence of internal heat radiation is of minor importance for the heat exchangers considered here.

KW - Additive manufacturing

KW - Experimental

KW - Friction-factors

KW - Heat exchanger

KW - Heat transfer coefficients

KW - High temperature

UR - http://www.scopus.com/inward/record.url?scp=85173465758&partnerID=8YFLogxK

U2 - 10.1016/j.ijheatmasstransfer.2023.124774

DO - 10.1016/j.ijheatmasstransfer.2023.124774

M3 - Article

AN - SCOPUS:85173465758

VL - 218

JO - International Journal of Heat and Mass Transfer

JF - International Journal of Heat and Mass Transfer

SN - 0017-9310

M1 - 124774

ER -