Evolution to chaotic natural convection in a horizontal annulus with an internally slotted circle

Zhao, Ming; Yu, Dingfeng; Zhang, Kun

doi:10.1016/j.ijheatmasstransfer.2018.06.007

Cited by 5 publications

(2 citation statements)

References 37 publications

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“…19 They found that under a fixed aspect ratio, the overall heat transfer rate increases with an increase in the Rayleigh number. Other related studies by Shu et al, 20 Dogonchi and Hashim, 21 Roy, 22 and Zhao et al 23 specified various aspects of the free convection flow in cavities having different configurations of inner and outer cylinders.…”

Section: Introductionmentioning

confidence: 99%

Preferred location of the porous sleeve in a concentric annulus depending on the thermal insulation

Jasim

Alkhabbaz

Hamzah

2022

Proceedings of the Institution of Mechanical Engineers, Part C:

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In this work, natural convection flow in a horizontal cylindrical annulus having a porous sleeve under constant volume is numerically examined and compared with a completely filled porous annulus. Three different locations for the porous sleeve were considered as follows: adjacent to the hot inner surface, in the middle of the annulus and adjacent to the cold outer surface. At each of these locations, the volume of the porous sleeve represents half the volume of the annulus. The code adopts a non-Darcian model to represent the steady laminar flow and heat transfer within the solid porous domain using the finite difference technique. The motivation of the current simulation is to show the influence of the porous sleeve locations on thermal insulation. The influences of a wide range of modified Rayleigh numbers [Formula: see text] and three various values of the porosity [Formula: see text], at [Formula: see text], [Formula: see text], and [Formula: see text], are examined. The results proved that the location of the fixed volume porous sleeve affects the thermal insulation. In addition, the best thermal insulation performance depends on the operating conditions of the system as well as the location of the porous sleeve and its porosity.

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Section: Introductionmentioning

confidence: 99%

Preferred location of the porous sleeve in a concentric annulus depending on the thermal insulation

Jasim

Alkhabbaz

Hamzah

2022

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…Their results indicated that the oscillatory flow undergoes several bifurcations and ultimately evolves to a chaotic flow. Zhao et al (2018) investigated the characteristics of evolution from laminar to chaotic nature convection inside the horizontal annulus with an internal slotted circle, they found that after the first bifurcation, the oscillatory flow underwent several bifurcations and finally transited into a chaotic flow. Park (2018, 2019) investigated bifurcation phenomena of natural convection in horizontal annulus under selfinduced circular magnetic fields.…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of Natural Convection in Internally Finned Horizontal Annuli

Zhang¹,

Gao²,

Wang³

2020

Frontiers in Heat and Mass Transfer

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Detailed numerical analysis is presented for natural convection heat transfer in internally finned horizontal annuli. Governing equations are discretized using the finite volume method, and solved using SIMPLE algorithm with Quick scheme. The results show that the flow and heat transfer can reach steady state when the Rayleigh number is below 2×10 4. When the Rayleigh number is greater than 3×10 4 , two different types of numerical solutions under the same parameters can be obtained for different initial conditions. The critical Rayleigh numbers with two different initial conditions are different from steady to unsteady solutions. The oscillatory flow undergoes several bifurcations and ultimately evolves to a chaotic flow as the Rayleigh numbers increase.

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Multi-scale LBM-FDM Analysis on Natural Convection Heat Transfer and Metal Particle Movements Inside Gas Insulated Switchgear

Li¹,

Yang²,

Gao³

et al. 2022

Lecture Notes in Electrical Engineering

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Evolution to chaotic natural convection in a horizontal annulus with an internally slotted circle

Cited by 5 publications

References 37 publications

Preferred location of the porous sleeve in a concentric annulus depending on the thermal insulation

Preferred location of the porous sleeve in a concentric annulus depending on the thermal insulation

Numerical Analysis of Natural Convection in Internally Finned Horizontal Annuli

Multi-scale LBM-FDM Analysis on Natural Convection Heat Transfer and Metal Particle Movements Inside Gas Insulated Switchgear

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