Computational Fluid Mechanics and Heat Transfer

Anderson, Dale; Tannehill, John C.; Pletcher, Richard H.

doi:10.1201/b12884

Cited by 885 publications

(326 citation statements)

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“…In the centreline, the Hospital's rule is utilized to get a correct representation of the diffusional terms notably for the heat flow and shear stress. At every location, the axial velocity profile and pressure gradient corrections are made by Raithby and Schneider (1979), which is described by Anderson et al (1984). Moreover, to enhance numerical solutions accuracy, a non-uniform grid is employed for axial and radial directions.…”

Section: Methodsmentioning

confidence: 99%

Combined Heat and Mass Transfer during Condensation of Vapours Mixture and Non-Condensable Gas in a Vertical Tube

Charef

Feddaoui

Alla

et al. 2019

JAFM

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The problem of laminar film condensation from binary vapours mixture with the presence of non-condensable gas (air) flowing in a vertical tube is numerically investigated. The set of the non-linear parabolic equations expressing the mass conservation, momentum, energy, and species diffusion in both phases with the boundary conditions are resolved by using a finite difference numerical scheme. A comparative study between the results obtained for three cases (water-ethanol-air, water-methanol-air, and ethanol-methanol-air) under the same conditions is made. The impact of varying the wall temperature, the inlet vapour mass fractions, and the inlet liquid mass flow rate on the conjugate the heat and mass transfer during the condensation of the studied mixtures are examined. It is found that the condensation of water-methanol-air corresponds to a higher latent heat flux QL2 and accumulated condensation rate Mr2 when compared with water-ethanol-air and ethanolmethanol-air. Moreover, the nature of the fluid plays an important role in the heat and mass exchanges.

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Section: Methodsmentioning

confidence: 99%

Combined Heat and Mass Transfer during Condensation of Vapours Mixture and Non-Condensable Gas in a Vertical Tube

Charef

Feddaoui

Alla

et al. 2019

JAFM

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“…Utilizing the Thomas algorithm (Anderson, Tannehill and Pletcher (1984)), the solution of Eqs. (27) -(30) has been done by means of a MATLAB code.…”

Section: Numerical Solutionmentioning

confidence: 99%

Transport of Reactive Species in Oscillatory Annular Flow

Debnath

Paul²,

Roy

2018

JAFM

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The present article purposes to investigate the solute dispersion through an annular pipe in the presence of heterogeneous chemical reactions among the species and wall of the annulus. The solute is considered to experience a kinetic reversible phase exchange with the inner wall layer and irreversible absorption into the wall. Two kinds of oscillatory flow (Poiseuille and Couette flow) are considered in order to track the complex interactions between the velocity distributions and the reaction parameters. The method of moments as proposed by Aris-Barton is used to determine the apparent dispersion coefficient. The moment equations has been solved by using a standard finite difference implicit scheme, valid for small as well as large times. Dispersion coefficient due to the combined effect of reversible and irreversible reactions has been discussed in a variety of flow situations. Dispersion coefficient may be enhanced owing to the reversible and irreversible heterogeneous reactions in the boundary. On the basis of flow characteristics, radius ratio provides a mixed behaviour of the dispersion coefficient. Dimensionless mass proves to be an increasing function of reversible and irreversible boundary reaction parameters.

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“…Owing to satisfy the global mass flow constraint, the pressure correction gradient and axial velocity profile are performed applying a method proposed by Raithby and Schneider [24], described by Anderson et al [25]. To fully explain, we let H ¼ dp dx = .…”

Section: Velocity and Pressure Couplingmentioning

confidence: 99%

Computational Study of Liquid Film Condensation with the Presence of Non-Condensable Gas in a Vertical Tube

Charef¹,

Feddaoui²,

Alla³

2018

Desalination and Water Treatment

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The main objective of this chapter is to study the liquid film condensation in a thermal desalination process, which is based on the phase change phenomenon. The external tube wall is subjected to a constant temperature. The set of the non-linear and coupled equations expressing the conservation of mass, momentum and energy in the liquid and gas mixtures is solved numerically. An implicit finite difference method is employed to solve the coupled governing equations for liquid film and gas flow together with the interfacial matching conditions. Results include radial direction profiles of axial velocity, temperature and vapour mass fraction, as well as axial variation of the liquid film thickness. Additionally, the effects of varying the inlet conditions on the phase change phenomena are examined. It was found that increasing the inlet-to-wall temperature difference improves the condensate film thickness. Decreasing the radius of the tube increased the condensation process. Additionally, non-condensable gas is a decisive factor in reducing the efficiency of the heat and mass exchanges. Overall, these parameters are relevant factors to improve the effectiveness of the thermal desalination units.

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Computational Fluid Mechanics and Heat Transfer

Cited by 885 publications

References 0 publications

Combined Heat and Mass Transfer during Condensation of Vapours Mixture and Non-Condensable Gas in a Vertical Tube

Combined Heat and Mass Transfer during Condensation of Vapours Mixture and Non-Condensable Gas in a Vertical Tube

Transport of Reactive Species in Oscillatory Annular Flow

Computational Study of Liquid Film Condensation with the Presence of Non-Condensable Gas in a Vertical Tube

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