This article deals with the experimental investigation of thermal performance of detached circular ring turbulators in turbulent flow regime.
The experiments were conducted by f our different circular rings.
Two different pitch ratios (1 and 2) and two different distances (1 mm and 2 mm) at which the circular rings were detached from the tube wall were considered in the experiments.
Uniform heat flux was applied to the external surface of the tube and Reynolds number was varied from 4350 to 24,920.
The tube with circular ring turbulators introduced both higher heat transfer and higher pressure drop than the smooth tube, depending on pitch ratio and distance.
According to the experimental results, the Nusselt number and friction factor increased with decreasing of pitch ratio and distance.
Therefore, the circular ring turbulator with a pitch ratio of 1 and distance of 1 mm offered the highest heat transfer rate accompanied by the highest pressure drop.
The highest thermal performance efficiency of 26% was also achieved for t his case at a Reynolds number of 4421.
Evidently, t he experimental results revealed t hat the best operating regime of all circular ring turbulators was found at low Reynolds number, leading to a more compact heat exchanger
This article deals with the experimental investigation of thermal performance of detached circular ring turbulators in turbulent flow regime. The experiments were conducted by f our different circular rings. Two different pitch ratios (1 and 2) and two different distances (1 mm and 2 mm) at which the circular rings were detached from the tube wall were considered in the experiments. Uniform heat flux was applied to the external surface of the tube and Reynolds number was varied from 4350 to 24,920. The tube with circular ring turbulators introduced both higher heat transfer and higher pressure drop than the smooth tube, depending on pitch ratio and distance. According to the experimental results, the Nusselt number and friction factor increased with decreasing of pitch ratio and distance. Therefore, the circular ring turbulator with a pitch ratio of 1 and distance of 1 mm offered the highest heat transfer rate accompanied by the highest pressure drop. The highest thermal performance efficiency of 26% was also achieved for t his case at a Reynolds number of 4421. Evidently, t he experimental results revealed t hat the best operating regime of all circular ring turbulators was found at low Reynolds number, leading to a more compact heat exchanger
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