Abstract
In this work, numerical simulation and particle image velocimetry (PIV) experiment are performed to investigate the heat transfer performance in a circular tube fitted with a longitudinal vortex generator in laminar flow. The spacing length (S), central angle (α), and slice height (H) of the longitudinal vortex generator are investigated for optimizing the structure of the insert. The results show that multiple pairs of longitudinal vortexes are generated, and the fluid can scour the tube wall owing to the concave surface of the insert. The heat transfer and flow resistance increase with the increase of the central angle and slice height and with the decrease of the spacing length. The overall thermal-hydraulic performance evaluation R3 is used to evaluate the comprehensive impact of heat transfer and friction factor, and it shows good performance in laminar flow.
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