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Journal articles on the topic 'Buoyancy flow'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Zaki, Fadlurrahman, and Dan Mugisidi. "Effect of buoyancy force on buoyancy waterwheel efficiency using numerical flow simulation." TEKNOSAINS : Jurnal Sains, Teknologi dan Informatika 11, no. 2 (2024): 209–21. http://dx.doi.org/10.37373/tekno.v11i2.976.

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In this work, the performance of a buoyant waterwheel to produce hydrokinetic power is investigated through analytical theory and computational fluid dynamics simulation. The impact of the buoyancy wheel is investigated by establishing the performance parameters through the use of a moving mesh approach and a realizable k-ε turbulence model. Transient simulation is required to comprehend the flow of physical processes. Using moving mesh as a transient methodology of the buoyancy waterwheel, numerical flow simulations and theoretical analytical methods are used in this study to assess the effec

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2

Mirajkar, Harish N., Partho Mukherjee, and Sridhar Balasubramanian. "On the dynamics of buoyant jets in a linearly stratified ambient." Physics of Fluids 35, no. 1 (2023): 016609. http://dx.doi.org/10.1063/5.0136231.

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We report mean flow and turbulence characteristics of a buoyant jet evolving in a linearly stratified ambient with stratification strength [Formula: see text]. The velocity and density fields are captured experimentally using simultaneous particle image velocimetry and planar laser-induced fluorescence technique. We report our findings by strategically choosing four axial locations such that it covers different flow regimes; namely, momentum-dominated region, buoyancy-dominated region, neutral buoyant layer, and plume cap region. The results at these axial locations are presented as a function

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3

Chen, Yen-Cho, and J. N. Chung. "The linear stability of mixed convection in a vertical channel flow." Journal of Fluid Mechanics 325 (October 25, 1996): 29–51. http://dx.doi.org/10.1017/s0022112096008026.

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In this study, the linear stability of mixed-convection flow in a vertical channel is investigated for both buoyancy-assisted and -opposed conditions. The disturbance momentum and energy equations were solved by the Galerkin method. In addition to the case with a zero heat flux perturbation boundary condition, we also examined the zero temperature perturbation boundary condition. In general, the mixed-convection flow is strongly destabilized by the heat transfer and therefore the fully developed heated flow is very unstable and very difficult to maintain in nature. For buoyancy-assisted flow,

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4

Ramaprian, B. R., and H. Haniu. "Measurements in Two-Dimensional Plumes in Crossflow." Journal of Fluids Engineering 111, no. 2 (1989): 130–38. http://dx.doi.org/10.1115/1.3243613.

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The mean-flow and turbulent properties of two-dimensional buoyant jets discharged vertically upward into a crossflowing ambient have been measured in a hydraulic flume, using laser velocimetry and microresistance thermometry. The trajectory of the resulting inclined plume is found to be nearly straight, beyond a short distance from the source. The flow is essentially characterized by the presence of buoyancy forces along (s-direction) and perpendicular (n-direction) to the trajectory. While the s-component buoyancy tends to destabilize the flow and hence raise the overall level of turbulence i

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5

Smith, Ronald. "Buoyancy effects in vertical shear dispersion." Journal of Fluid Mechanics 242 (September 1992): 371–86. http://dx.doi.org/10.1017/s0022112092002416.

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Density gradients modify the flow and hence the shear dispersion of one miscible fluid in another. A solution procedure is given for calculating the effects of weak buoyancy for vertical laminar parallel shear flows. A particular extrapolation to large buoyancy gives an exactly solvable nonlinear diffusion equation. For the particular case of vertical plane Poiseuille flow explicit formulae are derived for the flow, for the nonlinear shear dispersion coefficient and for the onset of instability. The exactly solvable model gives reasonably accurate results for the buoyancy-modified shear disper

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6

BAINES, PETER G. "Two-dimensional plumes in stratified environments." Journal of Fluid Mechanics 471 (November 5, 2002): 315–37. http://dx.doi.org/10.1017/s0022112002002215.

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Laboratory experiments on the flow of negatively buoyant two-dimensional plumes adjacent to a wall in a density-stratified environment are described. The flow passes through several stages, from an inertial jet to a buoyant plume, to a neutrally buoyant jet, and then a negatively buoyant plume when it overshoots its equilibrium density. This fluid then ‘springs back’ and eventually occupies an intermediate range of heights. The flow is primarily characterized by the initial value of the buoyancy number, B0 = Q0N3/g′02, where Q0 is the initial volume flux per unit width, g′0 is the initial buoy

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7

Epstein, M., and M. A. Kenton. "Combined Natural Convection and Forced Flow Through Small Openings in a Horizontal Partition, With Special Reference to Flows in Multicompartment Enclosures." Journal of Heat Transfer 111, no. 4 (1989): 980–87. http://dx.doi.org/10.1115/1.3250814.

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Estimates of the magnitude of buoyancy-driven exchange flows through openings in partitions that separate compartments are needed to assess the movement of toxic gases and smoke through buildings. An experiment using water and brine as a substitute for a light gas moving in a dense gas was designed to measure combined forced and buoyancy-driven exchange flow through a single opening in a horizontal partition. No theoretical treatment exists for this configuration. The same apparatus was used to determine the magnitude of the forced flow required to purge the opening of the oppositely directed

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8

Shabbir, Aamir, and William K. George. "Experiments on a round turbulent buoyant plume." Journal of Fluid Mechanics 275 (September 25, 1994): 1–32. http://dx.doi.org/10.1017/s0022112094002260.

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This paper reports a comprehensive set of hot-wire measurements of a round buoyant plume which was generated by forcing a jet of hot air vertically up into a quiescent environment. The boundary conditions of the experiment were measured, and are documented in the present paper in an attempt to sort out the contradictory mean flow results from the earlier studies. The ambient temperature was monitored to ensure that the facility was not stratified and that the experiment was conducted in a neutral environment. The axisymmetry of the flow was checked by using a planar array of sixteen thermocoup

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9

Gau, C., Y. C. Jeng, and C. G. Liu. "An Experimental Study on Mixed Convection in a Horizontal Rectangular Channel Heated From a Side." Journal of Heat Transfer 122, no. 4 (2000): 701–7. http://dx.doi.org/10.1115/1.1318211.

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Experiments are performed to study the mixed convection flow and heat transfer in a horizontal rectangular channel heated from a side. The channel is made of two vertical parallel plates with one of the plates heated uniformly and the opposite plate well insulated. The gap between the parallel plates is small and the height to gap ratio of the channel cross section is 6.67. Both flow visualization and the heat transfer along the heated wall are measured. The Reynolds number ranges from 317 to 2000, the buoyancy parameter, Gr/Re2, from 0 to 20000 and Pr of the air flow is 0.7. Flow structure in

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10

DIEZ, FRANCISCO J., and WERNER J. A. DAHM. "Effects of heat release on turbulent shear flows. Part 3. Buoyancy effects due to heat release in jets and plumes." Journal of Fluid Mechanics 575 (March 2007): 221–55. http://dx.doi.org/10.1017/s0022112006004277.

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An integral method is presented for determining effects of buoyancy due to heat release on the properties of reacting jets and plumes. This method avoids the Morton entrainment hypothesis entirely, and thus removes the ad hoc ‘entrainment modelling’ required in most other integral approaches. We develop the integral equation for the local centreline velocity uc(x), which allows modelling in terms of the local flow width δ (x). In both the momentum-dominated jet limit and buoyancy-dominated plume limit, dimensional arguments show δ (x) ≈ x, and experimental data show the proportionality factor

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11

Ramachandran, N., B. F. Armaly, and T. S. Chen. "Measurements and Predictions of Laminar Mixed Convection Flow Adjacent to a Vertical Surface." Journal of Heat Transfer 107, no. 3 (1985): 636–41. http://dx.doi.org/10.1115/1.3247471.

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Measurements and predictions of laminar mixed forced and free convection air flow adjacent to an isothermally heated vertical flat surface are reported. Local Nusselt numbers and the velocity and temperature distributions are presented for both the buoyancy assisting and opposing flow cases over the entire mixed convection regime, from the pure forced convection limit (buoyancy parameter ξ = Grx/Rex2 = 0) to the pure free convection limit (ξ = ∞). The measurements are in very good agreement with predictions and deviate from the pure forced and free convection regimes for buoyancy assisting flo

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12

Roubíček, Tomáš. "Steady-state buoyancy-driven viscous flow with measure data." Mathematica Bohemica 126, no. 2 (2001): 493–504. http://dx.doi.org/10.21136/mb.2001.134009.

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13

KUHLMANN, H. C., and U. SCHOISSWOHL. "Flow instabilities in thermocapillary-buoyant liquid pools." Journal of Fluid Mechanics 644 (February 10, 2010): 509–35. http://dx.doi.org/10.1017/s0022112009992953.

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The linear stability of the incompressible axisymmetric flow in a buoyant-thermocapillary liquid pool is considered which is heated from above by a heat flux with a parabolic radial profile. Buoyancy forces and radial thermocapillary stresses due to the inhomogeneous surface temperature distribution drive a toroidal vortex. In the absence of buoyancy and for low Prandtl numbers the basic flow becomes unstable typically by a stationary centrifugal instability. At moderate Prandtl numbers the rotational symmetry is broken by hydrothermal waves. In the limit of vanishing Prandtl number two other

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14

Andrej Horvat, Ivo Kljenak, Jure Ma. "ON INCOMPRESSIBLE BUOYANCY FLOW BENCHMARKING." Numerical Heat Transfer, Part B: Fundamentals 39, no. 1 (2001): 61–78. http://dx.doi.org/10.1080/104077901460687.

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15

Simpson, Mark W., and Ari Glezer. "Buoyancy-induced, columnar vortices." Journal of Fluid Mechanics 804 (September 13, 2016): 712–48. http://dx.doi.org/10.1017/jfm.2016.541.

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A buoyancy-induced, columnar vortex is deliberately triggered in the unstably stratified air layer over a heated ground plane and is anchored within, and scales with, an azimuthal array of vertical, stator-like planar flow vanes that form an open-top enclosure and impart tangential momentum to the radially entrained air flow. The columnar vortex comprises three coupled primary flow domains: a spiraling surface momentum boundary layer of ground-heated air, an inner thermally driven vertical vortex core and an outer annular flow that is bounded by a helical shear layer and the vanes along its in

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16

Ramachandran, N., T. S. Chen, and B. F. Armaly. "Mixed Convection in Stagnation Flows Adjacent to Vertical Surfaces." Journal of Heat Transfer 110, no. 2 (1988): 373–77. http://dx.doi.org/10.1115/1.3250494.

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Laminar mixed convection in two-dimensional stagnation flows around heated surfaces is analyzed for both cases of an arbitrary wall temperature and arbitrary surface heat flux variations. The two-dimensional Navier–Stokes equations and the energy equation governing the flow and thermal fields are reduced to a dimensionless form by appropriate transformations and the resulting system of ordinary differential equations is solved in the buoyancy assisting and opposing regions. Numerical results are obtained for the special cases for which locally similar solutions exist as a function of the buoya

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17

Carpenter, Bradley M., and G. M. Homsy. "Combined buoyant-thermocapillary flow in a cavity." Journal of Fluid Mechanics 207 (October 1989): 121–32. http://dx.doi.org/10.1017/s0022112089002521.

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We treat the problem of combined buoyancy-thermocapillary convection in a cavity with a free surface heated differentially in the horizontal. Attention is focused on the structure and strength of the flow for large ΔT, i.e. large Marangoni and Rayleigh numbers. In the combined problem, the boundary-layer scalings for buoyant and thermocapillary convection suggest that in the limit of large ΔT, thermocapillarity will dominate the large-scale flow. Accurate numerical solutions are used to study this question at fixed cavity aspect ratio and Prandtl number, with G = Ra/Ma as a parameter. For G =

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18

T., Anvesh, and Harish R. "Radiative Heat Transfer on Turbulent Mixed Convection Flows." International Journal of Engineering and Advanced Technology (IJEAT) 9, no. 4 (2020): 35–39. https://doi.org/10.35940/ijeat.C6424.049420.

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In the present study our intention is to dispatch the turbulent mixed convective flow and radiative flow in a vertical rectangular channel. The channel is constructed with two openings inlet and outlet. The turbulence is modelled by computational fluid dynamics (CFD) approach using lambremhorst turbulence model. Radiation is modelled with Discrete ordinates method (DOM). Finite difference method (FDM) is utilized to discretize the governing equations and an inhouse Fotron code is used to simulate the turbulent flow. The invariant study is carried out for the effect of flow opposite to buoyancy

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19

Toppaladoddi, S., and J. S. Wettlaufer. "The combined effects of shear and buoyancy on phase boundary stability." Journal of Fluid Mechanics 868 (April 17, 2019): 648–65. http://dx.doi.org/10.1017/jfm.2019.153.

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We study the effects of externally imposed shear and buoyancy driven flows on the stability of a solid–liquid interface. A linear stability analysis of shear and buoyancy-driven flow of a melt over its solid phase shows that buoyancy is the only destabilizing factor and that the regime of shear flow here, by inhibiting vertical motions and hence the upward heat flux, stabilizes the system. It is also shown that all perturbations to the solid–liquid interface decay at a very modest shear flow strength. However, at much larger shear-flow strength, where flow instabilities coupled with buoyancy m

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20

Gau, C., K. A. Yih, and W. Aung. "Reversed Flow Structure and Heat Transfer Measurements for Buoyancy-Assisted Convection in a Heated Vertical Duct." Journal of Heat Transfer 114, no. 4 (1992): 928–35. http://dx.doi.org/10.1115/1.2911903.

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Buoyancy-assisted convection flow and heat transfer processes in a heated vertical channel are studied experimentally for situations where the buoyancy parameter Gr/Re2 is relatively large. The channel wall is made of two parallel plates, with one wall heated uniformly and the opposite wall insulated. A uniform air flow is made to enter the channel from the bottom. The reversed flow is visualized, which occurs initially near the channel exit for the case when Gr/Re2 is greater than a threshold value. The cold reversed flow enters the channel from the outside and forms a V-shaped recirculating

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21

Olsson, C. O. "Buoyancy driven flow in counter flow heat exchangers." Journal of Physics: Conference Series 395 (November 26, 2012): 012058. http://dx.doi.org/10.1088/1742-6596/395/1/012058.

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22

Cessi, Paola, Christopher L. Wolfe, and Bonnie C. Ludka. "Eastern-Boundary Contribution to the Residual and Meridional Overturning Circulations." Journal of Physical Oceanography 40, no. 9 (2010): 2075–90. http://dx.doi.org/10.1175/2010jpo4426.1.

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Abstract A model of the thermocline linearized around a specified stratification and the barotropic linear wind-driven Stommel solution is constructed. The forcings are both mechanical (the surface wind stress) and thermodynamical (the surface buoyancy boundary condition). The effects of diapycnal diffusivity and of eddy fluxes of buoyancy, parameterized in terms of the large-scale buoyancy gradient, are included. The eddy fluxes of buoyancy are especially important near the boundaries where they mediate the transport in and out of the narrow ageostrophic down-/upwelling layers. The dynamics o

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23

Alnahit, Ali O., Nigel Berkeley Kaye, and Abdul A. Khan. "Understanding the Influence of the Buoyancy Sign on Buoyancy-Driven Particle Clouds." Fluids 9, no. 5 (2024): 101. http://dx.doi.org/10.3390/fluids9050101.

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A numerical model was developed to investigate the behavior of round buoyancy-driven particle clouds in a quiescent ambient. The model was validated by comparing model simulations with prior experimental and numerical results and then applied the model to examine the difference between releases of positively and negatively buoyant particles. The particle cloud model used the entrainment assumption while approximating the flow field induced by the cloud as a Hill’s spherical vortex. The motion of individual particles was resolved using a particle tracking equation that considered the forces act

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24

Laidoudi, Houssem, and Mohamed Bouzit. "Non-Newtonian Power-Law Flows around Circular Cylinder under Aiding/Opposing Thermal Buoyancy." Diffusion Foundations 16 (June 2018): 45–56. http://dx.doi.org/10.4028/www.scientific.net/df.16.45.

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This paper presents a comprehensive computational work on hydrodynamic and thermal phenomena of upward flow separation around a confined circular cylinder by aiding/opposing thermal buoyancy. For that purpose, let us consider a confined flow of Non-Newtonian power-law fluid around a heated/cooled circular cylinder in a two-dimensional vertical channel. The effects of thermal buoyancy and power-Law index on the flow separation and the average Nusselt number are studied for the conditions: (10 ≤ Re ≤ 40), (0.4≤ n ≤ 1.2), (-0.5 ≤ Ri ≤ 0.8), Pr = 50 and blockage ratio β = 0.2. In the steady flow r

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25

Stein, W., and H. Brandt. "A Numerical Study of Turbulent Heat Transfer in a Spherical Annulus." Journal of Heat Transfer 110, no. 4a (1988): 870–76. http://dx.doi.org/10.1115/1.3250587.

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A numerical study of steady, buoyant, incompressible water flow and heat transfer through a spherical annulus has been made. A two-dimensional computer code based on the TEACH code was rewritten in spherical coordinates to model the Navier–Stokes equation and to model fluid turbulence with a k–ε turbulence model. Results are given for the total system Nusselt number, local heat transfer rate, and fluid flow characteristics for both buoyant and nonbuoyant laminar and turbulence modeled flow. Incorporating both the turbulence model and buoyancy into the calculations improves the results.

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26

Aung, Win, and G. Worku. "Developing Flow and Flow Reversal in a Vertical Channel With Asymmetric Wall Temperatures." Journal of Heat Transfer 108, no. 2 (1986): 299–304. http://dx.doi.org/10.1115/1.3246919.

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Numerical results are presented for the effects of buoyancy on the hydrodynamic and thermal parameters in the laminar, vertically upward flow of a gas in a parallel-plate channel. Solutions of the governing parabolic equations are obtained by the use of an implicit finite difference technique coupled with a marching procedure. It is found that buoyancy dramatically increases the hydrodynamic entry length but diminishes the thermal development distance. At a fixed wall temperature difference ratio, buoyancy enhances the heat transfer on the hot wall but has little impact on the cool wall heat t

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27

Lai, M. C., S. M. Jeng, and G. M. Faeth. "Structure of Turbulent Adiabatic Wall Plumes." Journal of Heat Transfer 108, no. 4 (1986): 827–34. http://dx.doi.org/10.1115/1.3247019.

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Weakly buoyant turbulent wall plumes were studied for surfaces inclined 0–62 deg from the vertical (stable orientation). The source of buoyancy was carbon dioxide/air mixtures in still air, assuring conserved buoyancy flux. Profiles of mean and fluctuating concentrations and streamwise velocities were measured at several stations along the wall. Flow structure was also observed by Mie scattering from a laser light sheet. Tests with inclined walls showed that low levels of ambient stratification caused the wall plumes to entrain fluid in the horizontal direction, rather than normal to the wall.

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28

Ramachandran, N., B. F. Armaly, and T. S. Chen. "Measurements of Laminar Mixed Convection Flow Adjacent to an Inclined Surface." Journal of Heat Transfer 109, no. 1 (1987): 146–50. http://dx.doi.org/10.1115/1.3248035.

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Measurements of laminar mixed forced and free convection air flow adjacent to an upward and a downward facing, isothermal, heated inclined surface (at 45 deg) are reported. Local Nusselt number and the velocity and temperature distributions are presented for both the buoyancy assisting and the buoyancy opposing flow cases for a range of buoyancy parameter 0 ≤ ξ ≤ 5 (ξ = Grx/Rex2). The measurements are in good agreement with predictions which define a laminar mixed convection regime for buoyancy assisting flow as 0.1 ≤ ξ ≤ 7, and for buoyancy opposing flows as 0.06 ≤ ξ ≤ 0.25 for this inclinati

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29

Fragkou, Anastasia, and Panos Papanicolaou. "Positively and Negatively Round Turbulent Buoyant Jets into Homogeneous Calm Ambient." Proceedings 2, no. 11 (2018): 572. http://dx.doi.org/10.3390/proceedings2110572.

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A mathematical model has been employed to determine the characteristics of Boussinesq round buoyant jets which are injected horizontally or at an angle to horizontal, into a homogeneous, calm ambient. The solution of a system of three conservation first order nonlinear differential equations was obtained with a 4th Runge-Kutta scheme, using an entrainment coefficient which is related to the local Richardson number of the flow. Two types of positively and negatively buoyant jets were investigated (i) those where the buoyancy is a function of salinity henceforth called saline jets, and (ii) thos

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30

PAPANICOLAOU, PANOS N., ILIAS G. PAPAKONSTANTIS, and GEORGE C. CHRISTODOULOU. "On the entrainment coefficient in negatively buoyant jets." Journal of Fluid Mechanics 614 (October 16, 2008): 447–70. http://dx.doi.org/10.1017/s0022112008003509.

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Integral models proposed to simulate positively buoyant jets are used to model jets with negative or reversing buoyancy issuing into a calm, homogeneous or density-stratified environment. On the basis of the self-similarity assumption, ‘top hat’ and Gaussian cross-sectional distributions are employed for concentration and velocity. The entrainment coefficient is considered to vary with the local Richardson number, between the asymptotic values for simple jets and plumes, estimated from earlier experiments in positively buoyant jets. Top-hat and Gaussian distribution models are employed in a wi

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31

Gladstone, Charlotte, and Andrew W. Woods. "Detrainment from a turbulent plume produced by a vertical line source of buoyancy in a confined, ventilated space." Journal of Fluid Mechanics 742 (February 21, 2014): 35–49. http://dx.doi.org/10.1017/jfm.2013.640.

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AbstractNew experiments are presented which explore the dynamics of a turbulent buoyant plume produced by a vertically distributed linear source of buoyancy of strength $f$ per unit height. In a uniform environment, the plume volume flux increases with height from the base of the source, $z$, as $q(z) = {2^{-1/3}} {\pi }^{2/3} \alpha ^{4/3} f^{1/3} z^2$ where the entrainment coefficient, $\alpha = 0.09\pm 0.01$. In an enclosed space, with a net upward vertical ventilation flow $Q_V$, the buoyant plume generates a steady ambient stratification. The lowest part of the space, $z<h_i$, where $q

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32

Zhao, Li-Qing, Jian-Hong Sun, and Yang Lu. "Flow patterns of vertical plane thermal buoyant jet in shallow water." Modern Physics Letters B 32, no. 12n13 (2018): 1840041. http://dx.doi.org/10.1142/s0217984918400419.

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A heated plane water jet impinging vertically onto free water surface has been numerically studied based on large eddy simulation method coupled with the volume of fluid approach. The Boussinesq approximation is adopted to simulate the effect of buoyancy. Results showed that there exist two flow patterns for the plane thermal buoyant jet, which are the stable impinging flow pattern and the flapping impinging flow pattern. Distinct temperature stratification can be found in the stable impinging flow pattern, while it disappears in the flapping impinging flow pattern.

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33

Cui, Peng-Yi, Jia-Qi Wang, Feng Yang, et al. "Effects of Radiant Floor Heating Integrated with Natural Ventilation on Flow and Dispersion in a Newly Decorated Residence." International Journal of Environmental Research and Public Health 19, no. 24 (2022): 16889. http://dx.doi.org/10.3390/ijerph192416889.

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To date, few studies have been conducted on the characteristics of flow and dispersion caused by indoor radiant floor heating integrated with natural ventilation. In this study, we employed reduced−scale numerical models validated by wind−tunnel experiments to investigate the influence of radiant floor heating integrated with natural ventilation on airflow, heat transfer, and pollutant dispersion within an isolated building. The Richardson number (Ri) was specified to characterize the interaction between the inflow inertia force and the buoyancy force caused by radiant floor heating. Several R

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34

Peppes, A. A., M. Santamouris, and D. N. Asimakopoulos. "Buoyancy-driven flow through a stairwell." Building and Environment 36, no. 2 (2001): 167–80. http://dx.doi.org/10.1016/s0360-1323(99)00062-1.

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35

Meckel, T. A., and S. L. Bryant. "Buoyancy-driven Flow in Heterogeneous Materials." Energy Procedia 63 (2014): 5495–502. http://dx.doi.org/10.1016/j.egypro.2014.11.582.

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36

Ciofalo, M., N. Cancilla, A. Cipollina, A. Tamburini, and G. Micale. "Influence of thermal buoyancy on heat transfer in spacer-filled channels for Membrane Distillation." Journal of Physics: Conference Series 2940, no. 1 (2025): 012007. https://doi.org/10.1088/1742-6596/2940/1/012007.

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Abstract Numerical results are discussed for the flow in a horizontal plane channel filled with a novel sphere-rod spacer and exchanging heat from both the top and the bottom sides. Direct Numerical Simulations (DNS) are compared with RANS ones based on different turbulence models in the Reynolds number range 100∼2000. Preliminary comparisons for non-buoyant flow show that models using wall functions perform poorly, grossly overpredicting Nusselt numbers, while ω-based models resolving the viscous-conductive sublayer all yield satisfactory results. In the presence of buoyancy, simulations usin

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37

Hwang, J. J., W. J. Wang, and Cha’o Kuang Chen. "Buoyancy-Driven Flow Reversal Phenomena in Radially Rotating Serpentine Ducts." Journal of Heat Transfer 122, no. 1 (1999): 179–83. http://dx.doi.org/10.1115/1.521453.

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Convective characteristics are analyzed numerically in a rotating multipass square duct connecting with 180-deg sharp returns. Isoflux is applied to each duct wall and periodic conditions are used between the entrance and exit of a typical two-pass module. Emphasis is placed on the phenomenon of buoyancy-driven reversed flow in the serpentine duct. Predictions reveal that the radial distance from the rotational axis to the location of flow separation in the radial-outward duct decreases with increasing the Richardson number. In addition, the local buoyancy that is required to yield the radial

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38

Lin, W. L., and T. F. Lin. "Observation and Computation of Vortex and/or Reverse Flow Development in Mixed Convection of Air in a Slightly Inclined Rectangular Duct." Journal of Heat Transfer 119, no. 4 (1997): 691–99. http://dx.doi.org/10.1115/1.2824173.

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Combined flow visualization and conjugated numerical heat transfer analysis were carried out to study the axial evolution of the buoyancy induced secondary vortex and reverse flow in a mixed convective air flow through a bottom heated, slightly inclined rectangular duct. Results were obtained for the Grashof number Gr ranging from 1.6 × 103 to 2.8 × 105, inclined angle φ from −20 deg to 26 deg and the Reynolds number Re below 102 covering the steady and time dependent flows. For the buoyancy-opposing case, at a certain critical buoyancy-to-inertia ratio depending on the Re and φ both the exper

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39

SHAPIRO, ALAN, and EVGENI FEDOROVICH. "Katabatic flow along a differentially cooled sloping surface." Journal of Fluid Mechanics 571 (January 4, 2007): 149–75. http://dx.doi.org/10.1017/s0022112006003302.

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Buoyancy inhomogeneities on sloping surfaces arise in numerous situations, for example, from variations in snow/ice cover, cloud cover, topographic shading, soil moisture, vegetation type, and land use. In this paper, the classical Prandtl model for one-dimensional flow of a viscous stably stratified fluid along a uniformly cooled sloping planar surface is extended to include the simplest type of surface inhomogeneity – a surface buoyancy that varies linearly down the slope. The inhomogeneity gives rise to acceleration, vertical motions associated with low-level convergence, and horizontal and

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Colin, Catherine, Jean Fabre, and Arjan Kamp. "Turbulent bubbly flow in pipe under gravity and microgravity conditions." Journal of Fluid Mechanics 711 (September 27, 2012): 469–515. http://dx.doi.org/10.1017/jfm.2012.401.

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AbstractExperiments on vertical turbulent flow with millimetric bubbles, under three gravity conditions, upward, downward and microgravity flows ($1g$, $\ensuremath{-} 1g$ and $0g$), have been performed to understand the influence of gravity upon the flow structure and the phase distribution. The mean and fluctuating phase velocities, shear stress, turbulence production, gas fraction and bubble size have been measured or determined. The results for $0g$ flow obtained during parabolic flights are taken as reference for buoyant $1g$ and $\ensuremath{-} 1g$ flows. Three buoyancy numbers are intro

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Kuo, Dah-Chyi, and Kenneth S. Ball. "Taylor–Couette flow with buoyancy: Onset of spiral flow." Physics of Fluids 9, no. 10 (1997): 2872–84. http://dx.doi.org/10.1063/1.869400.

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Kuo, Dah-Chyi, and K. S. Ball. "Taylor-Couette flow with buoyancy: onset of spiral flow." Oceanographic Literature Review 45, no. 1 (1998): 194. https://doi.org/10.1016/s0967-0653(98)80976-9.

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HUNT, G. R., and P. F. LINDEN. "Steady-state flows in an enclosure ventilated by buoyancy forces assisted by wind." Journal of Fluid Mechanics 426 (January 10, 2001): 355–86. http://dx.doi.org/10.1017/s0022112000002470.

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We examine ventilation driven by a point source of buoyancy on the floor of an enclosure in the presence of wind. Ventilation openings connecting the internal and external environment are at high level on the leeward façade and at low level on the windward façade, so that the wind-driven flow in the enclosure is in the same sense as the buoyancy-driven flow. We describe laboratory experiments that determine the parameters controlling the ventilation under these conditions and compare the results with predictions of a theoretical model.Previous work has shown that when ventilation is driven sol

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Shapiro, Alan, and Evgeni Fedorovich. "Similarity models for unsteady free convection flows along a differentially cooled horizontal surface." Journal of Fluid Mechanics 736 (November 7, 2013): 444–63. http://dx.doi.org/10.1017/jfm.2013.538.

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AbstractA class of unsteady free convection flows over a differentially cooled horizontal surface is considered. The cooling, specified in terms of an imposed negative buoyancy or buoyancy flux, varies laterally as a step function with a single step change. As thermal boundary layers develop on either side of the step change, an intrinsically unsteady, boundary-layer-like flow arises in the transition zone between them. Self-similarity model solutions of the Boussinesq equations of motion, thermal energy, and mass conservation, within a boundary-layer approximation, are obtained for flows of u

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Barrios-Piña, Hector, Hermilo Ramírez-León, and Carlos Couder-Castañeda. "Analysis of Flow Evolution and Thermal Instabilities in the Near-Nozzle Region of a Free Plane Laminar Jet." Mathematical Problems in Engineering 2015 (2015): 1–11. http://dx.doi.org/10.1155/2015/891894.

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This work focuses on the evolution of a free plane laminar jet in the near-nozzle region. The jet is buoyant because it is driven by a continuous addition of both buoyancy and momentum at the source. Buoyancy is given by a temperature difference between the jet and the environment. To study the jet evolution, numerical simulations were performed for two Richardson numbers: the one corresponding to a temperature difference slightly near the validity of the Boussinesq approximation and the other one corresponding to a higher temperature difference. For this purpose, a time dependent numerical mo

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Incropera, F. P., C. E. Lents, and R. Viskanta. "Gradient Layer Entrainment in a Thermohaline System With Mixed Layer Circulation." Journal of Solar Energy Engineering 108, no. 4 (1986): 267–74. http://dx.doi.org/10.1115/1.3268105.

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Entrainment of salt-stratified fluid into a bottom mixed layer is investigated under conditions for which mixing is driven by bottom heating and/or an imposed horizontal flow. Entrainment rate measurements and mixed layer flow visualization suggest that entrainment is strongly influenced by a shear mechanism involving both horizontal and vertical fluid velocity components. Under certain conditions, imposition of the horizontal flow inhibits the buoyancy flow and entrainment rates for combined mixing are less than those for pure buoyant mixing. Attempts to correlate entrainment rates in terms o

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Haga, Masakazu, Tsuyoshi Kondo, and Takayuki Hamauchi. "Experimental and Numerical Analyses of the Flow and Temperature of Buoyancy-Marangoni Convection in a Liquid." Applied Mechanics and Materials 880 (March 2018): 27–32. http://dx.doi.org/10.4028/www.scientific.net/amm.880.27.

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Flow patterns and temperature distributions of buoyancy–Marangoni convection in a liquid were analyzed both experimentally and theoretically. We focused on two-dimensional natural convection in a horizontal liquid layer. In the experiment, silicone oil (with a viscosity of 1 × 10−5 m2/s) was used as a test liquid and the temperature and velocity fields were visualized using liquid crystal capsules. The visualization experiment included cases of both steady flow and oscillatory flow. In the case of a deep liquid layer, an oscillatory flow with repeated acceleration and deceleration occurred due

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Weaver, J. A., and R. Viskanta. "Natural Convection in Binary Gases Due to Horizontal Thermal and Solutal Gradients." Journal of Heat Transfer 113, no. 1 (1991): 141–47. http://dx.doi.org/10.1115/1.2910518.

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The influence of augmenting and opposing thermal and solutal buoyancy forces on natural convection of binary gases due to horizontal temperature and concentration gradients is examined through comparison of smoke flow visualization and measured temperature and concentration distributions with numerical predictions. The observed flow at the cold wall was unsteady for opposing body forces. The same basic flow structure was observed, but the unsteady flow intensifies as the opposing solutal buoyancy force increases as compared to the thermal buoyancy force. Comparison of predicted and measured te

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Kuo, Allen, R. Alan Plumb, and John Marshall. "Transformed Eulerian-Mean Theory. Part II: Potential Vorticity Homogenization and the Equilibrium of a Wind- and Buoyancy-Driven Zonal Flow." Journal of Physical Oceanography 35, no. 2 (2005): 175–87. http://dx.doi.org/10.1175/jpo-2670.1.

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Abstract The equilibrium of a modeled wind- and buoyancy-driven, baroclinically unstable, flow is analyzed using the transformed Eulerian-mean (TEM) approach described in Part I. Within the near-adiabatic interior of the flow, Ertel potential vorticity is homogenized along mean isopycnals—a finding readily explained using TEM theory, given the geometry of the domain. The equilibrium, zonal-mean buoyancy structure at the surface is determined entirely by a balance between imposed surface fluxes and residual mean and eddy buoyancy transport within a “surface diabatic layer.” Balance between thes

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BRYDEN, MICHELLE D., and HOWARD BRENNER. "Mass-transfer enhancement via chaotic laminar flow within a droplet." Journal of Fluid Mechanics 379 (January 25, 1999): 319–31. http://dx.doi.org/10.1017/s0022112098003395.

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The Stokes flow occurring within a non-neutrally buoyant spherical droplet translating by buoyancy through an immiscible liquid which is undergoing simple shear is shown to be chaotic under many circumstances for which the droplet translates by buoyancy through the entraining fluid. This flow is easily produced, for example, when the droplet rises (or falls) through the annular space of a vertical concentric-cylinder Couette viscometer or through a vertical Poiseuille flow. The parameters studied include: (i) droplet/bulk fluid viscosity ratio; (ii) shear strength/bubble rise velocity ratio; a

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