Three-dimensional numerical study and field synergy principle analysis of wavy fin heat exchangers with elliptic tubes

Thermal performance criteria of elliptic tube bundle in crossflow

“…Results indicated that the heat transfer performance of the elliptic tube is much better than for round tube under a constant pumping power. Recently, Tao et al [13] investigated numerically the laminar heat transfer and fluid flow characteristics for circular and elliptic tube arrangements. They concluded that a 30% gain of the heat transfer and consequently 10% increasing in the friction factor have been obtained.…”

An investigation of the thermo-hydraulic performance of the smooth wavy fin-and-elliptical tube heat exchangers utilizing new type vortex generators

“…Considering overall advantages of wavy fins compared to the plain fins, due to the generated secondary Görtler vortices, and also, as we know, the blockage area of elliptical tube is smaller than circular tube, so the intensity of horseshoe vortices formed around elliptical tubes are weaker. Hence combining a wavy fin with the elliptical tube can improve the velocity near the elliptical tube wall and also effects of secondary vortices can be imposed to increase the heat transfer rate near the elliptical tube [38]. From the local Nusselt number contours it can be seen that the Nusselt number increases near the wave crest and wave trough due to at these positions the thermal boundary layer is broken up.…”

“…Wongwises and Chokeman [36] and Kim et al [37] experimentally examined the influence of tube rows and tube diameter on flow and heat transfer characteristics in wavy FTHEs. Tao et al [38] investigated the heat transfer and fluid flow characteristics of wavy FTHEs with elliptical/circular tubes. Lately, Wang et al [34] provided the most updated thermal hydraulic correlations obtained by including all the previous data and new experimental results of wavy FTHEs.…”

Heat transfer characteristics of supercritical CO2 flow in metal foam tubes

“…Because the heat transfer performance in the heat source side of the gas heater has been improved greatly [4][5][6], enhancement of the heat transfer in the refrigerant side has also become important. In the last decade, metal foam has been widely applied in industries due to its unique structural properties and advanced thermal performance.…”