Mass transfer in plane and square ducts

Beale, Steven

doi:10.1016/j.ijheatmasstransfer.2005.02.037

Cited by 19 publications

(5 citation statements)

References 19 publications

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“…The free jet flow downstream is strongly influenced by the orifice configuration and inlet boundary condition [27]. Thus, different computational domains have been used, depending on the orifice configuration and dimension, labeled A -C ( Fig.…”

Section: General Set-up Of the Simulationsmentioning

confidence: 99%

Analysis of FDS 6 Simulation Results for Planar Air Curtain Related Flows from Straight Rectangular Ducts

Beji

Liu

et al. 2017

Fire Technol

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CFD results are discussed for jet flows through a straight square duct, which is an interesting configuration in the context of air curtain flows for smoke and heat control in buildings in case of fire. The CFD package Fire Dynamics Simulator, Version 6.0.1, is used. Special focus is given to the impact of the inlet boundary condition on the flow field in the near-field region. Investigation of different orifice configurations (W = 2 cm width, variable span-wise length), including calculations inside a straight square duct (2 cm × 2 cm, with variable length) ahead of the air orifice, reveals a small vena contracta effect when the orifice is flush with a solid boundary, leading to an acceleration of the flow in the symmetry plane in the near-field region. The vena contracta effect disappears if the co-flow at the nozzle exit is aligned with the jet. More important is the effect of the duct length (precursor domain length, serving as method to generate inflow turbulent conditions for the main computation): imposing a top hat velocity profile, a sufficiently long duct (i.e., L = 20W) is required for the flow to become fully developed at the orifice. The CFD results confirm an analytical correlation for the ratio of the entrance length to the hydraulic diameter of the duct as function of the Reynolds number, provided the duct width is used as characteristic length scale. Using a sufficiently fine mesh, i.e., 10 cells across the characteristic dimension of the nozzle, the evolution of the mean and RMS stream-wise velocity along the centerline, as well as their profiles across the nozzle width, are shown to be captured accurately in the CFD results

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Section: General Set-up Of the Simulationsmentioning

confidence: 99%

Analysis of FDS 6 Simulation Results for Planar Air Curtain Related Flows from Straight Rectangular Ducts

Beji

Liu

et al. 2017

Fire Technol

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“…Comini and Croce [18] considered periodic mass transfer in tube-fin heat exchangers under conditions of prescribed wall value, based on local saturation conditions for an ideal gas mixture. Beale [19] considered fully-developed mass transfer in plane and square ducts. The velocity and scalar profiles were presumed similar according to…”

Section: Primitive Variable Approachmentioning

confidence: 99%

On the Implementation of Stream-Wise Periodic Boundary Conditions

Beale

2005

Heat Transfer: Volume 2

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Fully-developed periodic boundary conditions have frequently been employed to perform calculations on the performance of typical elements of heat exchangers. Many such calculations have been achieved by transforming the equations of motion to obtain a new set of state variables which are cyclic in the stream-wise direction. In others, primitive variables, based on substitution schemes are employed. In this paper; a review of existing procedures is provided, and a new method is proposed. The method is based on the use of primitive variables with periodic boundary conditions combined with the use of slip values. Either pressure difference or mass flow rate may be prescribed, and both constant wall temperature and constant heat flux wall conditions may be considered. The example of an offset-fin plate-fin heat exchanger is used to illustrate the application of the procedure. The scope and limitations of the method are discussed in detail, and the mathematical basis by which the method may be extended to the consideration of problems involving mass transfer, with associated continuity, momentum, and species source/sinks is proposed. INTRODUCTIONIn the application of computational fluid dynamics to heat exchanger design, it has long been recognized that much computational effort may be spared by considering elements deep within the design where the flow is 'fully-developed'; for example; Thom and Alpelt [1], LeFeuvre [2], and Massey [3] considered fully-developed flow in tube banks assuming a cyclical 2-D stream function/vorticity formulation. In [2,3] temperature was also solved-for.More recently, the equations of motion are usually solved in terms of primitive variables, for which the steady-state form is typically written, subject to certain simplifications, as:

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“…On that work the non linear differential equations have been solved by finite difference method to get the velocity distribution. The flow behavior for Newtonian fluid along a duct channel has been studied with the effect of mass transfer [12]. Here the solution is obtained with different parametric effect such as driving force, blowing parameter and normalized conductance.…”

Section: Introductionmentioning

confidence: 99%

Study on Flow Behavior in Terminal Bronchus of Human Lung for Porous Medium

Akhtera

Ahmmed

2022

GANIT: J. Bangladesh Math. Soc.

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Flow simulation along human lung channel is one of the interests of investigation in fluid dynamics. We have studied flow phenomena of 11th generation of human lung as porous medium. The governing equations of porous medium have been solved numerically using finite difference scheme. The effect of different flow parameters are illustrated graphically. It is observed that the flow rate increases for increasing the value of pressure gradient, the porosity effect, effective viscosity and the dimensionless parameter . The numerical experiment for non-porous medium is also studied. It is found that the flow rate increases in porous medium compared with non-porous medium. GANIT J. Bangladesh Math. Soc. 42.1 (2022) 069- 080

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Mass transfer in plane and square ducts

Cited by 19 publications

References 19 publications

Analysis of FDS 6 Simulation Results for Planar Air Curtain Related Flows from Straight Rectangular Ducts

Analysis of FDS 6 Simulation Results for Planar Air Curtain Related Flows from Straight Rectangular Ducts

On the Implementation of Stream-Wise Periodic Boundary Conditions

Study on Flow Behavior in Terminal Bronchus of Human Lung for Porous Medium

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