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

Ndiaye, Pape Tamsir; Ndiaye, Momath; Mbow, Cheikh; Ndiaye, Goumbo

doi:10.15866/irea.v8i4.18687

Cited by 2 publications

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“…The length of entry (Le) is defined as the length from the channel inlet to the meeting of the two liquid films. This is the length of the channel from which the boundaries layers conditions are not applicable anymore [16].…”

Section: Determination Of the Lengths Of Entry (Le)mentioning

confidence: 99%

“…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%

“…In their article, Ndiaye P. T. . et al [16] presented the numerical study of the condensation of thin layers in forced convection of pure saturated vapor in a channel whose walls are covered with a porous material. By noting that the two films of the chain vary and can meet; they were the first to study this phenomenon thanks to the length of entry.…”

Section: Introductionmentioning

confidence: 99%

“…There is an exponential decrease in length of entry and it is strong when the Jacob number is between Ja= 1 E-8 and Ja= 2 E-8 : a great sensitivity of condensation can be observed, in conclusion.In our case we will always study the phenomenon of the meeting of the two liquid films like Ndiaye P.T. et al [16]. But this time with the influence of the ratio of form instead of the Jacob's number.…”

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: Determination Of the Lengths Of Entry (Le)mentioning

confidence: 99%