Open AccessThe effects of the axis ratio on the flow and heat transfer characteristics around a drop-shaped tube
Author(s) -
Rawad Deeb,
D V Sidenkov
Publication year - 2021
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/2057/1/012001
Subject(s) - nusselt number , pressure drop , reynolds number , mechanics , materials science , heat transfer , heat transfer coefficient , tube (container) , drop (telecommunication) , thermodynamics , boundary layer , physics , turbulence , composite material , mechanical engineering , engineering
Flow and heat transfer characteristics around single drop-shaped tubes with different axis ratio ( L/D ) in cross-flow are studied numerically for values of Reynolds number in the range 1.3×10 3 to 20×10 3 . The results are obtained using the commercial software ANSYS Fluent for a two-dimensional (2D) computational domain. The axis ratio of the studied tubes is varied from 1 to 4, when L/D =1, the tube is circular. The simulation results agree well with the available literature. The distribution of local coefficients of pressure and friction over half of the tube’s surface is plotted and analysed. It found that the drop-shaped tubes delay the separation of the boundary layer from the tube wall. The results confirm that the minimum value of pressure coefficient decreases as L/D decreases, and the maximum value of the friction coefficient gradually increases with the growth of L/D. The result of the numerical simulation indicates the superior overall performance of drop-shaped tube with L/D =4 over the rest of the tubes. Correlations of the average Nusselt number and the friction factor in terms of Reynolds number, calculated by the maximum velocity in the minimum free cross-section, and axis ratios for the studied cases are proposed.