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The Effect of Flow Excitation with Stationary and Rotating Obstacles in a Heat Exchanger Tube on Thermal–Hydraulic Characteristics
Ist Teil von
Iranian Journal of Science and Technology. Transactions of Mechanical Engineering, 2022-06, Vol.46 (2), p.465-480
Ort / Verlag
Cham: Springer International Publishing
Erscheinungsjahr
2022
Link zum Volltext
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
In this study, the effect of a stationary and rotating circular ring and disk on heat transfer enhancement and flow characteristics in the tube of the heat exchanger is investigated experimentally. Using the ring obstacle with different angle index, obstacle structure optimization, and studying the effect of obstacle rotation on the thermal-hydraulic characteristics is an innovative, useful topic and new knowledge. The obstacle rotating, as an effective factor in stimulating the thermal boundary layer symmetrically, makes it possible to use a section of present obstacles with a lower cross section. For the experiments, a heat exchanger was used, which introduced water into the shell and air into the tube. In the present study, the effect of obstacle rotational speed ranging from 50 to 200 rpm on the thermal performance at the Reynolds number of 6000–29,000 were investigated. The heat transfer ratios in a pipe with circular ring inserts enhanced as 2.74–3.9 times in comparison with the smooth pipe. According to the results, the maximum thermal coefficient performance of the rotating obstacle was recorded, 24% higher than that of the stationary obstacle at PR = 2,
d
/
D
= 0.8 and
n
= 200 rpm. According to the obtained results, using an obstacle with less angular index and suitable rotation is a beneficial suggestion for improved performance of heat exchangers used in various industries.