Direct Numerical Simulation of Flow and Heat Transfer From a Sphere in a Uniform Cross-Flow

Bagchi, Prosenjit; Ha, Man Yeong; Balachandar, S.

doi:10.1115/1.1358844

Cited by 90 publications

(70 citation statements)

References 19 publications

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“…Because a full system of HIBM & MPM equations was solved (on the assumption that solid body has a high rigidity) this test validates FSI algorithm. For the validation of the heat transfer problem, a steady flow past a hot sphere was considered and predictions were compared with data of Bagchi et al [45]. The calculated Nusselt numbers are in good agreement with the cited data.…”

Section: Introductionmentioning

confidence: 58%

A computational strategy for simulating heat transfer and flow past deformable objects

Gilmanov¹,

Acharya²

2008

International Journal of Heat and Mass Transfer

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Section: Introductionmentioning

confidence: 58%

A computational strategy for simulating heat transfer and flow past deformable objects

Gilmanov¹,

Acharya²

2008

International Journal of Heat and Mass Transfer

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“…For any flow problem, the key parameter is the Reynolds number, Re. The fluid flow past a rigid sphere is steady, laminar and axisymmetric for Re ≤ 210 (Clift et al 1978;Johnson and Patel 1999;Bagchi et al 2001). Obviously, these results cannot be directly extrapolated to the present problem.…”

Section: Resultsmentioning

confidence: 86%

A Numerical Study of the Flow Past an Impermeable Sphere Embedded in a Porous Medium

Juncu

2015

Transp Porous Med

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The flow past an impermeable sphere embedded in a fluid-saturated porous medium was investigated numerically. The flow is considered viscous, laminar, axisymmetric, steady and incompressible. The generalized model for fluid flow through an isotropic, rigid and homogeneous porous medium was used. The stream function-vorticity equations were solved numerically in spherical coordinates system by a defect correction multigrid method. The computations were focused on the influence of the Darcy number (Da) and Forchheimer constant on the flow field for two boundary conditions on the surface of the sphere: slip and no-slip. The conditions when the macroscopic inertial terms of the generalized model can be neglected are presented. For high-porosity porous media, the macroscopic inertial terms of the generalized model can be neglected if Da Re < 1 (Re is the sphere Reynolds number).

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“…Drag coefficient, reattachment length, separation angle, Nusselt number and Sherwood number were used to compare the numerical results calculated by our code with data in the literature [9,21,22,31]. Figure 2 shows the calculated averaged Nusslet number Nu av and separation angle θ s as a function of Reynolds number, and compares those values with the experimental data are available in Frössling [9] and Clift et al [21].…”

Section: Numerical Algorithm and Examination Of The Validity Of The Nmentioning

confidence: 95%

“…In such a small Re, flow is laminar and axisymmetric [21,22]. For the liquid phase, it is assumed that the droplet maintains a spherical shape.…”

Section: Mathematical Modelmentioning

confidence: 99%

Thermal-drag and Transition from Quasi-steady to Highly-unsteady Combustion of a Fuel Droplet in the Presence of Upstream Velocity Oscillations

Jangi

Shaw

Kobayashi

2009

Flow Turbulence Combust

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Numerical studies on the behaviors of combustion of 1-butanol fuel droplet at presence of upstream velocity oscillation are performed. Fuel droplet has an initial diameter of 1.25 mm and ambiance pressure and temperature are 0.4 MPa and 300 K, respectively. These conditions are those in which the microgravity experiments in literature conducted. In the excellent agreement with the experimental data, numerical results show a significant enhancement of the burning rate of droplet compared to what is predicted by quasi-steady film theory models. The mechanism of the enhancement of burning rate is clarified then by observation of a new mechanism that is named thermal-drag, TD. It is shown, depending on the amplitude and frequency of the upstream velocity oscillation, the flame in wake region of droplet can move toward the droplet surface by the force of vortex flow motions produced by the TD mechanism. It is verified that such movement of the flame is responsible for the enhancement of the burning rate and deviation of the response of the evaporation process form the predictions of the quasi-steady model. Frequency analysis of the burning rate reveals that at low frequency and amplitude the FFT diagram of the burning rate contains of only one main peak synchronies with the frequency of upstream velocity oscillation, which implies a quasi-steady response. However; at high frequency and amplitude the diagram includes of wide range of 98 Flow Turbulence Combust (2010) 84:97-123 frequencies beside of the main peak that readily shows deviation from the quasisteady conditions. In the latter, the study on the response of the combustion to the upstream velocity fluctuations in which the fluctuations contains of three wave numbers shows the amplification of the effects of low frequency fluctuations rather than that of damping of the effects of high frequency fluctuations on the evaporation processes.

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Direct Numerical Simulation of Flow and Heat Transfer From a Sphere in a Uniform Cross-Flow

Cited by 90 publications

References 19 publications

A computational strategy for simulating heat transfer and flow past deformable objects

A computational strategy for simulating heat transfer and flow past deformable objects

A Numerical Study of the Flow Past an Impermeable Sphere Embedded in a Porous Medium

Thermal-drag and Transition from Quasi-steady to Highly-unsteady Combustion of a Fuel Droplet in the Presence of Upstream Velocity Oscillations

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