Coriolis force effect in steady and unsteady flow characteristics with convective heat transfer through a curved square duct

Roberto, Rocha, Zeban

Keywords

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Abstract

The uses of curved ducts are applied not only to omnipresent the engineering machinery but also to the human body. Therefore, scholars so much are interested in investigating the phenomenon of flow through different types of ducts for the benefit of mankind. To the author knowledge, there is no known detailed study about the change of fluid flow behavior for both positive and negative rotation through the curved square duct. In the ongoing exploration, various types of fluid phenomena such as solution structures, time-history analysis, and temperature gradients have been performed for an extensive range of rotational parameters, the Taylor number, . The solution structures have been enumerated by the spectral method whereas the time history analysis has been calculated by the function collocation as well as the Crank-Nicolson together with Adam-Bashforth method. It has seen that different types of flow instabilities have been found from the steady and unsteady solution. Two types of flow velocity, axial and secondary flow, and their temperature profiles have been also explored for different rotational parameters. The steady solutions have shown that the flow patterns have a significant change at their turning points. In the time history analysis, especially four types of flow characteristics, steady-state, periodic, multi-periodic and chaotic oscillation has established, where only two vortexes secondary flows have been found for the steady-state solution and two to six vortex have been consisted for the regular and irregular oscillation. In this study, a sub-sequential connection between the axial flow, secondary flow, and the temperature profiles have been built up. Moreover, understanding more clearly about the regular and irregular oscillation, phase spaces and power spectrums have been also obtained. The analysis of heat transfer has shown that the heat is transmitted from fluid particles, as a result, convective heat transfer has occurred and the heat in the fluid has increased, consequently, the fluid has mixed and affected the vortex structures.