Physical simulation of thermal and hydrjdynamic characterictics of channels with oval-trench vortex generators


Аuthors

1, Isayev S. A.2*, S. 1, Popov I. A.1**, Gortyshov Y. F.1

1. Kazan National Research Technical University named after A.N. Tupolev, 10, Karl Marks str., Kazan, 420111, Russia
2. Saint-Petersburg State University of Civil Aviation, 38, Pilotov str., St. Petersburg, 196210, Russia

*e-mail: isaev3612@yandex.ru
**e-mail: popov-igor-alex@yandex.ru

Abstract

Vortex generation and flow disruption in heat exchangers passages by means of surface modification are a widely used passive heat transfer augmentation techniques. The present paper contains the results of numerical and experimental studies of the hydraulic resistance and heat transfer in the rectangle duct with oval-trench and oval-arc shaped dimples applied to the heat transfer surface. For the turbulent flow in the duct (Pr = 0.71, Red = 3200—9⋅104 — for heat transfer determination and Red = 500⋅104 — for the friction factor measurements) rational geometrical parameters of the oval-trench dimple were determined: relative elongation of dimple l/b = 5.57–6.78 and relative depth l/b = 5.57–6.78, while the value of the attack angle to the mean flow was fixed φ = (45–60)°. The comparison of the experimental and numerical modeling for the flow in the narrow duct over the surface with a singleand multi-row dimple arrangement has revealed a good agreement. It was found that the average heat transfer coefficients in such ducts could be increased 1.5–2.5 times by means of singleand multi-row dimples application on the heat transfer surface. The heat transfer augmentation for the surfaces with the oval-arched dimples was found to be 10% greater than the one for the oval-trench dimples. The corresponding friction factor augmentation was found to be 125–300% in comparison to the smooth surface duct. The obtained experimental data were used for the data generalization. Derived generalized equation allows predicting the friction factor and heat transfer coefficients values for the flow over the single-row oval-trench simple arrangement. The maximal deviation of the experimental data from the proposed equations was found to be 20%. The application of the artificial neural networks for predicting the hydraulic resistance and heat transfer augmentation in such ducts was presented.

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