2019
DOI: 10.1108/hff-02-2019-0111
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Direct numerical simulations of laminar and transitional flows in diverging pipes

Abstract: Purpose Fluid flows in pipes whose cross-sectional area are increasing in the stream-wise direction are prone to separation of the recirculation region. This paper aims to investigate such fluid flow in expansion pipe systems using direct numerical simulations. The flow in circular diverging pipes with different diverging half angles, namely, 45, 26, 14, 7.2 and 4.7 degrees, are considered. The flow is fed by a fully developed laminar parabolic velocity profile at its inlet and is connected to a long straight … Show more

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Cited by 41 publications
(16 citation statements)
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“…This expansion vortex can also be observed in the results of Vittal Shenoy et al. (2019). With inlet perturbations, in the laminar region right after the expansion there is also the formation of a larger clockwise spiral or helical vortex that grows until the flow breaks down into the turbulence puff with numerous smaller vortices.…”
Section: Resultssupporting
confidence: 70%
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“…This expansion vortex can also be observed in the results of Vittal Shenoy et al. (2019). With inlet perturbations, in the laminar region right after the expansion there is also the formation of a larger clockwise spiral or helical vortex that grows until the flow breaks down into the turbulence puff with numerous smaller vortices.…”
Section: Resultssupporting
confidence: 70%
“…This type of boundary condition, similar to the one used by Vittal Shenoy et al. (2019), with further discussion in Ol'shanskii & Staroverov (2000) and Hasan, Anwer & Sanghi (2005), is used to minimize numerical oscillations or reflections of outgoing waves and vortices, but is otherwise expected to behave the same as a zero-velocity-gradient condition. The kinematic pressure at the outlet is calculated from the velocity considering the dynamic pressure (i.e.…”
Section: Numerical Methods and Modellingmentioning
confidence: 99%
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“…It can augment the wetted surface between the fluid and absorber and also intensify the outlet temperature of the fluid. Furthermore, employing mixers in heat exchangers is not only one way to remove the laminar sub-layer but also a means of improving heat transfer by creating local turbulence [1][2][3][4][5][6]. The aim of this work is to examine the impact of using a heat sink and mixer on the energetic and exergetic performance of FPSCs.…”
Section: Introductionmentioning
confidence: 99%
“…Although the problem is a classic case [12][13][14][15][16][17][18][19][20][21][22][23][24][25], the study of its exergy is discussed comprehensively in rare studies [1,26]. The entropy analysis of the flow systems is performed in many flow motions [27][28][29][30][31][32][33][34], as well and the recent developments in fluid modeling [35][36][37][38][39].…”
Section: Introductionmentioning
confidence: 99%