Hydrodynamic resistance coefficient reduction of the drop-shaped pipe bundle due to the angle of attack changing

Аuthors

Deeb R.

Damascus University, Syria, Damascus

e-mail: e.rawad.deeb@yandex.com, DeebR@mpei.ru

Abstract

Numerical study of the possibility of hydrodynamic coefficient reduction of the drop-shape pipebundles by the angle of attack control was performed in the presented work. The authors considered ten cases of the twenty-row pipe bundles of circular and drop shape with the in-line and staggered arrangement. The work was performed for the Reynolds numbers in the range of Re = 1,78×10³–1,87×10⁴ and angles of attack of θ_i-j = 0°–360°. Simulation results revealed that the hydrodynamic resistance coefficient of the in-line and staggered drop-shaped tube bundles was approximately 30,64–56,27 % and 51,6–58,77 % less than that of the in-line and staggered circular tube bundles, respectively. The studies revealed that the less values of the hydrodynamic resistance coefficient were achieved for the case 6 (θ_1-5 = 0°, θ_6-10 = 330°, θ_11-15 = 30°, θ_16-20 = 0°). A formula for the hydrodynamic resistance coefficient computing for the case 6 with maximum deviation of 0,48%.

Keywords:

drop-shaped tube, circular tube, heat exchanger, hydrodynamic resistance coefficient, energyefficient pipe bundle, CFD, Ansys Fluent

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