TY - JOUR
T1 - Thermal and flow characteristics of a single-row circular-finned tube heat exchanger under elevated free-stream turbulence
AU - Moore, J. A.
AU - Stevenson, J. P.J.
AU - Grimes, R.
N1 - Publisher Copyright:
© 2015 Elsevier Inc.
PY - 2016/2/1
Y1 - 2016/2/1
N2 - The thermal performance of single-row heat exchangers is generally considered to be inferior to multi-row heat exchangers. It is therefore desirable to optimize the former; especially for those cases which cannot accommodate an alternative. In this study, the heat transfer performance of a single-row circular-finned tube heat exchanger was investigated experimentally under elevated disturbance levels. Specifically, grid-generated turbulence (GGT)-the characteristics of which had been measured beforehand with a hot-wire anemometer-was applied to a clean-flow benchmark case and measurements taken at the heat exchanger outlet. It was shown that when the grid is positioned appropriately, a mean enhancement (in global Nusselt number) of up to 11% can be achieved. Flow visualizations revealed the flow structures responsible for the increase in heat transfer.
AB - The thermal performance of single-row heat exchangers is generally considered to be inferior to multi-row heat exchangers. It is therefore desirable to optimize the former; especially for those cases which cannot accommodate an alternative. In this study, the heat transfer performance of a single-row circular-finned tube heat exchanger was investigated experimentally under elevated disturbance levels. Specifically, grid-generated turbulence (GGT)-the characteristics of which had been measured beforehand with a hot-wire anemometer-was applied to a clean-flow benchmark case and measurements taken at the heat exchanger outlet. It was shown that when the grid is positioned appropriately, a mean enhancement (in global Nusselt number) of up to 11% can be achieved. Flow visualizations revealed the flow structures responsible for the increase in heat transfer.
KW - Grid-generated turbulence
KW - Heat exchanger flow visualization
KW - Single-row circular finned tubes
UR - http://www.scopus.com/inward/record.url?scp=84949033664&partnerID=8YFLogxK
U2 - 10.1016/j.ijheatfluidflow.2015.11.001
DO - 10.1016/j.ijheatfluidflow.2015.11.001
M3 - Article
AN - SCOPUS:84949033664
SN - 0142-727X
VL - 57
SP - 48
EP - 57
JO - International Journal of Heat and Fluid Flow
JF - International Journal of Heat and Fluid Flow
ER -