TY - JOUR
T1 - Enhanced heat transfer in tubes based on vascular heat exchangers in fish: Experimental investigation
AU - Navickaitė, Kristina
AU - Mocerino, Andrea
AU - Cattani, Luca
AU - Bozzoli, Fabio
AU - Bahl, Christian
AU - Liltrop, Klaus
AU - Zhang, Xiaodan
AU - Engelbrecht, Kurt
PY - 2019
Y1 - 2019
N2 - A double corrugated tube geometry for improved heat transfer performance
inspired by vascular heat exchangers found in fish such as the tuna and
the opah is presented. The geometry features a cross section that
varies continuously in the flow direction while maintaining a constant
hydraulic diameter, which gives enhanced heat transfer at a relatively
low increase in pressure drop. Five ellipse-based tubes with varying
corrugation severity and period that emulate blood vessels of fish were
produced in an aluminium alloy using additive manufacturing technology.
Thermal performance of the novel tube design was experimentally
investigated in a counter flow tube-in-shell heat exchanger in a range
of Reynolds numbers from 1000 to 2500. Correlations for the Nusselt
number and friction factor for each tube are proposed and the
experimental results show that the Nusselt number increases up to 500%
in corrugated tubes compared to a straight tube. The global
thermo-hydraulic performance, evaluated for the same pumping power, of
the double corrugated tubes is up to 160% higher than that of a straight
tube.
AB - A double corrugated tube geometry for improved heat transfer performance
inspired by vascular heat exchangers found in fish such as the tuna and
the opah is presented. The geometry features a cross section that
varies continuously in the flow direction while maintaining a constant
hydraulic diameter, which gives enhanced heat transfer at a relatively
low increase in pressure drop. Five ellipse-based tubes with varying
corrugation severity and period that emulate blood vessels of fish were
produced in an aluminium alloy using additive manufacturing technology.
Thermal performance of the novel tube design was experimentally
investigated in a counter flow tube-in-shell heat exchanger in a range
of Reynolds numbers from 1000 to 2500. Correlations for the Nusselt
number and friction factor for each tube are proposed and the
experimental results show that the Nusselt number increases up to 500%
in corrugated tubes compared to a straight tube. The global
thermo-hydraulic performance, evaluated for the same pumping power, of
the double corrugated tubes is up to 160% higher than that of a straight
tube.
KW - Vascular heat exchanger
KW - Double corrugation
KW - High performance heat transfer devices
KW - Biomimetic
KW - Modified Wilson plot
KW - Nusselt number correlation
U2 - 10.1016/j.ijheatmasstransfer.2019.03.067
DO - 10.1016/j.ijheatmasstransfer.2019.03.067
M3 - Journal article
SN - 0017-9310
VL - 137
SP - 192
EP - 203
JO - International Journal of Heat and Mass Transfer
JF - International Journal of Heat and Mass Transfer
ER -