Mei Su

TL;DR: In order to further improve the heat transfer performance of compact heat exchanger, curved delta winglet vortex generators with different geometric sizes are experimentally studied for circular tube-and-fin this paper.

TL;DR: In this paper, the effects of fin pitches and tube diameters on the air side heat transfer performance of a tube bank fin heat exchanger using curved delta-winglet vortex generators were experimentally investigated, and the counterpart plain fin was selected as a reference for optimizations of fin geometries.

TL;DR: In this paper, the characteristic temperature in the definition of the fin side surface heat transfer coefficient of two tube bank fin heat exchangers is investigated in detail, and it is shown that if the average temperature of fin side fluid is used in the description of the coefficient, a small discrepancy between the numerical and experimental results is obtained.

TL;DR: In this article, the authors numerically studied the optimal fin spacing regarding the different front flow velocities of a circular tube bank fin heat exchanger with vortex generators, and the results showed that when front velocity is 1.75 m/s, the optimal length of fin was 2.25 mm and when front speed was higher than 2.5 m/m/s.

TL;DR: In this paper , a three-start twisted tube with oval dimples was proposed to further improve the heat transfer performance inside tubes, and the effects of dimple depths on the characteristics of fluid flow and heat transfer were numerically studied.