Numerical investigation on the transition of fluid flow characteristics through a rotating curved duct

• Autorzy: Hasan Mohammad Sanjeed , Islam MD. Sirajul , Badsha MD. Faisal , Mondal Rabindra Nath , Lorenzini Giulio

Identyfikatory

DOI

10.2478/ijame-2020-0034

• Języki publikacji: EN

Abstrakty

EN

Time-dependent flow investigation through rotating curved ducts is utilized immensely in rotating machinery and metal industry. In the ongoing exploration, time-dependent solutions with flow transition through a rotating curved square duct of curvature ratio 0.009 have been performed. Numerical calculations are carried out for constant pressure gradient force, the Dean number Dn = 1000 and the Grashof number Gr = 100 over a wide range of the Taylor number values […] for both positive and negative rotation of the duct. The software Code:Blocks has been employed as the second programming tool to obtain numerical solutions. First, time evolution calculations of the unsteady solutions have been performed for positive rotation. To clearly understand the characteristics of regular and irregular oscillations, phase spaces of the time evolution results have been enumerated. Then the calculations have been further attempted for negative rotation and it is found that the unsteady flow shows different flow instabilities if Tr is increased or decreased in the positive or in the negative direction. Two types of flow velocities such as axial flow and secondary flow and temperature profiles have been exposed, and it is found that there appear two- to four-vortex asymmetric solutions for the oscillating flows for both positive and negative rotation whereas only two-vortex for the steady-state solution for positive rotation but four-vortex for negative rotation. From the axial flow pattern, it is observed that two high-velocity regions have been created for the oscillating flows. As a consequence of the change of flow velocity with respect to time, the fluid flow is mixed up in a great deal which enhances heat transfer in the fluid.

Słowa kluczowe

EN

rotating curved duct; Taylor number; flow transition; secondary flow; heat transfer

PL

wymiana ciepła; przepływ wtórny; liczba Taylora

• Wydawca: Oficyna Wydawnicza Uniwersytetu Zielonogórskiego
• Czasopismo: International Journal of Applied Mechanics and Engineering
• Rocznik: 2020
• Tom: Vol. 25, no. 3
• Strony: 45--63
• Opis fizyczny: Bibliogr. 37 poz., rys., wykr.

Twórcy

autor

Hasan Mohammad Sanjeed

• Department of Mathematics, Bangabandhu Sheikh Mujibur Rahman Science and Technology University Gopalganj-8100, BANGLADESH

autor

Islam MD. Sirajul

• Department of Mathematics, Bangabandhu Sheikh Mujibur Rahman Science and Technology University Gopalganj-8100, BANGLADESH

autor

Badsha MD. Faisal

• Department of Mathematics and Statistics, Bangladesh University of Business and Technology Dhaka-1216 BANGLADESH

autor

Mondal Rabindra Nath

• Department of Mathematics, Jagannath University Dhaka-1100, BANGLADESH

autor

Lorenzini Giulio

• Department of Engineering and Architecture, University of Parma Parma 43124, ITALY

Bibliografia

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Uwagi

PL

Opracowanie rekordu ze środków MNiSW, umowa Nr 461252 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2021)