Enhanced heat transfer in tubes based on vascular heat exchangers in fish: Experimental investigation

Abstract

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

“…From (Navickaite et al, 2019c). On the other hand, the double corrugated tube with constant A c shows one of the lowest PECs that was tested (Navickaite et al, 2019b).…”

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.…”

Interactions between Dislocations and Boundaries during Deformation

“…Dislocations-phase interface interactions play an important role for structural metals, in not only the strength [ 136 , 137 ], but also other mechanical properties such as ductility and toughness [ 138 ], wear resistance [ 139 ], fatigue properties [ 140 , 141 , 142 , 143 ] and micro-pitting [ 144 ], as well as the properties of heterogeneous structures [ 145 , 146 , 147 ]. All these need the systematic investigations with exquisitely designed experiments and/or simulations.…”