Thermo-Hydraulic Performance of Pillow-Plate Heat Exchangers with Secondary Structuring: A Numerical Analysis

Reza Afsahnoudeh, Andreas Wortmeier, Maik Holzmüller, Yi Gong, Werner Homberg and Eugeny Y. Kenig ()
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Reza Afsahnoudeh: Chair of Fluid Process Engineering, Paderborn University, 33098 Paderborn, Germany
Andreas Wortmeier: Chair of Fluid Process Engineering, Paderborn University, 33098 Paderborn, Germany
Maik Holzmüller: Chair of Forming and Machining Technology, Paderborn University, 33098 Paderborn, Germany
Yi Gong: Chair of Forming and Machining Technology, Paderborn University, 33098 Paderborn, Germany
Werner Homberg: Chair of Forming and Machining Technology, Paderborn University, 33098 Paderborn, Germany
Eugeny Y. Kenig: Chair of Fluid Process Engineering, Paderborn University, 33098 Paderborn, Germany

Energies, 2023, vol. 16, issue 21, 1-14

Abstract: Pillow-plate heat exchangers (PPHEs) represent a suitable alternative to conventional shell-and-tube and plate heat exchangers. The inherent waviness of their channels promotes fluid mixing in the boundary layers and facilitates heat transfer. The overall thermo-hydraulic performance of PPHEs can further be enhanced by applying secondary surface structuring, thus increasing their competitiveness against conventional heat exchangers. In this work, various secondary structures applied on the PPHE surface were studied numerically to explore their potential to enhance near-wall mixing. Computational fluid dynamics (CFD) simulations of single-phase turbulent flow in the outer PPHE channel were performed and pressure drop, heat transfer coefficients, and overall thermo-hydraulic efficiency were determined. The simulation results clearly demonstrate a positive impact of secondary structuring on heat transfer in PPHEs.

Keywords: pillow-plates; heat exchanger; heat transfer; surface structuring; secondary structures (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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