Heat and mass transfer for liquid film condensation along a vertical channel covered with a thin porous layer

Nasr, Abdelaziz

doi:10.1016/j.ijthermalsci.2017.10.016

Cited by 19 publications

(4 citation statements)

References 22 publications

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“…A numeric model of heat and mass transfer enhancement of liquid film condensation by covering a porous layer on one of channel vertical plates has been studied by Abdelaziz Nasr [10]. He confirmed that the heat and mass transfer performance at the liquid-gas interface when condensing the liquid film is enhanced by the presence of the porous layer.A numerical study of the liquid film condensation from vapour-gas mixtures of HFC refrigerants inside a vertical tube was carried out by Charef A. et al [11].…”

Section: Introductionmentioning

confidence: 94%

“…The condensation of vapor in a porous medium has received great interest in many theoretical and experimental researches [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18]. Shekarriz and Plumb [1] analyzed the influence of the presence of the porous medium on the condensation of a film on the external wall of a horizontal tube.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Study of Thin Film Condensation in Forced Convection in a Canal Whose Walls Are Covered with a Porous Material: Influence of ratio of form-Determination of Lengths of Entry

2022

JCBSC

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The forced convection thin film type condensation of pure saturated vapor in a channel whose walls are covered with a porous material is studied numerically. To describe the flow, in the porous medium the generalized model of Darcy-Brinkman-Forchheimer (DBF) is used while the classical equations of the boundary layer have been exploited in pure liquid. These equations thus rendered dimensionless, are solved by an implicit finite difference method and the iterative Gauss-Seidel sub-relaxation method. We note that an increase in the ratio of form (or length of the cold plate) allows better contact with the cold plate, increases the friction imposed by this porous wall and allows a decrease in velocity and temperatures in the porous medium and the pure liquid. It also causes an increase in the thickness of the liquid film (favored condensation), decreases the rate of heat transfer at the porous medium / liquid film interface and the lengths of entry. This decrease in lengths of entry is exponential and very significant when the ratio of form is between 55 and 100 (55≤L/A≤100). We conclude that the sensitivity of condensation to a change in ratio of form is very high between 55 and 100.

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Section: Introductionmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Numerical Study of Thin Film Condensation in Forced Convection in a Canal Whose Walls Are Covered with a Porous Material: Influence of ratio of form-Determination of Lengths of Entry

2022

JCBSC

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“…However, they showed that the use of the diverging channels deteriorates the condensation heat transfer coefficient. Nasr (2018) numerically treated the pure liquid film condensation flowing down on a vertical channel coated with a porous layer. The author showed that the liquid film condensation is enhanced with the presence of the porous layer.…”

Section: Introductionmentioning

confidence: 99%

Binary liquid film condensation from water-ammonia vapors mixture flowing downward along a parallel plate condenser

Nasr,

Nassif,

Al-Ghamdi

2023

Front. Mech. Eng.

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The ammonia-water film condensation is used as an efficient working fluid in industrial applications such as refrigeration, plate condenser and evaporator, absorber/generator heat exchange, air-conditioning, heat pumps and separation processes. The present work focuses on a numerical investigation of water-ammonia condensation on a falling binary liquid film inside a parallel plate condenser by mixed convection. The parallel plate condenser is composed by two parallel vertical plates. One of the plates is wetted by liquidfilm and cooled by the thermal flux cooling while the other plate is isothermal and dry. Parametric computations were performed to investigate the effects of the inlet parameters of gas, the properties of the binary liquid film as well as the thermal flux cooling on the combined mass and heat transfer and on the efficiency of the parallel plate condenser. The results show that an increase in the inlet vapor of ammonia as well as of vapor water enhances the efficiency of the parallel plate condenser. It is shown also that an enhancement of efficiency of the parallel plate condenser has been recorded when the thermal flux cooling and inlet liquid flow rate is elevated. Whereas the increase of the inlet liquid concentration of ammonia inhibits the efficiency of the parallel plate condenser.

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“…Nandeppanavar et al 11 examined the warm dissemination in Newtonian liquid film stream over a flat slip whose extending amount and heat were elements of both space and time. Nasir 12 mathematically investigated a coupled mass and heat impacts for Newtonian fluid film buildup. The expansion of the porosity improves the water film buildup.…”

Section: Introductionmentioning

confidence: 99%

Unsteady thermal Maxwell power law nanofluid flow subject to forced thermal Marangoni Convection

Jawad

Saeed

Gul

et al. 2021

Sci Rep

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In the current work, the unsteady thermal flow of Maxwell power-law nanofluid with Welan gum solution on a stretching surface has been considered. The flow is also exposed to Joule heating and magnetic effects. The Marangoni convection equation is also proposed for current investigation in light of the constitutive equations for the Maxwell power law model. For non-dimensionalization, a group of similar variables has been employed to obtain a set of ordinary differential equations. This set of dimensionless equations is then solved with the help of the homotopy analysis method (HAM). It has been established in this work that, the effects of momentum relaxation time upon the thickness of the film is quite obvious in comparison to heat relaxation time. It is also noticed in this work that improvement in the Marangoni convection process leads to a decline in the thickness of the fluid’s film.

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Heat and mass transfer for liquid film condensation along a vertical channel covered with a thin porous layer

Cited by 19 publications

References 22 publications

Numerical Study of Thin Film Condensation in Forced Convection in a Canal Whose Walls Are Covered with a Porous Material: Influence of ratio of form-Determination of Lengths of Entry

Numerical Study of Thin Film Condensation in Forced Convection in a Canal Whose Walls Are Covered with a Porous Material: Influence of ratio of form-Determination of Lengths of Entry

Binary liquid film condensation from water-ammonia vapors mixture flowing downward along a parallel plate condenser

Unsteady thermal Maxwell power law nanofluid flow subject to forced thermal Marangoni Convection

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