Investigation of flow pattern, thermohydraulic performance and heat transfer improvement in 3D corrugated circular pipe under varying structure configuration parameters with development different correlations

摘要

In this research analysis, the flow structure, pressure drop, thermo-hydraulic performance, and improvement of heat transfer of a three dimensions pipe with varying corrugated geometrical configurations are numerically investigated using FLUENT software. The numerical simulation model is first compared and validated experimental results. Different corrugated configuration pipes are applied, influences of geometrical parameters, including the distance between arc rings (DBAR) of 2, 4, and 6 mm. The corrugated arc ring angle (CARA) of 10°, 20°, and 30°, and the arc ring angle around the pipe (ARAAP) of 120°, 180°, and 240° respectively on the thermal performance and flow characteristics under varying conditions. The varied range of Re number from 4000 to 12,000. The outcomes reveal that the flow pattern, pressure drop, and thermal performance considerably changes when using corrugated absorber pipes. The DBAR configuration with 2 mm has the maximum friction factor than other parameters by about from 1.2 to 2.9, respectively. The Nu ratios are higher than the normal pipe by about from 1.02 to 2.9. As the Re increases with CARA increases, the pressure drop of the corrugated pipes is increased from 26% to 79%, respectively. The impact of ARAAP configurations is varied for all pipes at a varying range of Re. The value of Nu increased from 3.7% to 29% for ARAAP of 120° and from 9.9% to 34.2% for ARAAP of 180° as well as from 11.4% to 38% for ARAAP of 120°. The higher value of PEF more than 1.3 at ARAAP of 120° and Re of 4000.