Elliptical double corrugated tubes for enhanced heat transfer

Abstract

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Nature—Inspired Flow Patterns for Active Magnetic Regenerators Assessed Using a 1D AMR Model

“…The impact of the corrugation period K and aspect ratio AR on the thermo-hydraulic performance of the double corrugated tubes has been analyzed using CFD software. The modeling results have been reported in Navickaite et al (2019a), and in that article it was demonstrated that in the low Reynolds number region the double corrugated tubes with shorter corrugation period K are more effective (Navickaite et al, 2019a). Moreover, increasing thermal efficiency was obtained for double corrugated tubes with increasing AR up to 2.2.…”

“…Moreover, the simulations were performed using constant pressure drop conditions that were normalized to the length of modeled tubes. This implies that the mass flow rate passing through the tubes varied (Navickaite et al, 2019a).…”

Performance Assessment of Double Corrugated Tubes in a Tube-In-Shell Heat Exchanger

“…The experimental and CFD simulation results on double corrugated tube geometry were first presented in [20,21], respectively. There, the enhancement of the heat transfer was numerically and experimentally analysed for internal flow.…”

“…There, the enhancement of the heat transfer was numerically and experimentally analysed for internal flow. The double corrugation of the tube wall was shown to break up the thermal boundary layers and hinder their development, thus increasing the heat transfer through the tube wall at a reasonable increase in pressure drop [20,21]. The geometry of these double corrugated tubes mimics the blood vessels in counter flow heat exchangers existing in warm-blooded fish [27] and those fish species that are able to maintain their regional body temperature higher than that of their living environment [28].…”

“…Multiple studies on different augmented and/or coated surfaces [6], e.g., tubes with fitted inserts [9][10][11][12], grooved surfaces [13][14][15] and structured microchannels [16] have been reported. Various types of corrugations have been analysed as well; for instance, tubes with multiple starts [17], tubes with alternating ellipse axes [18,19] and double corrugated tubes with constant hydraulic diameter, D h , or constant cross-section area, A c , [20,21]. All of the reported numerical and/or experimental studies have demonstrated a significant increase in heat transfer inside the tube geometry with higher or lower increase in pressure drop compared to a baseline case.…”