Convective mass transfer for turbulent flow (acidizing)

Input(s)

DAD_{A}: Diffusion Coefficient of Component A (cm2/s)\left(\mathrm{cm}^{2} / \mathrm{s}\right)

DED_{E} : Effective Diffusion Coefficient of Component A (cm2/s)\left(\mathrm{cm}^{2} / \mathrm{s}\right)

dca/dYd c_{a} / d Y : Concentration Gradient (mol/cm4)\left(\mathrm{mol} / \mathrm{cm}^{4}\right)

cac_{a} : Concentration of Flowing Acid (mol/cm3)\left(\mathrm{mol} / \mathrm{cm}^{3}\right)

<ca><c_{a}> : Average Concentration of Flowing Acid (mol/cm3)\left(\mathrm{mol} / \mathrm{cm}^{3}\right)

<ca(w)><c_{a}(w)> : Average Concentration of Flowing Acid (mol/cm3)\left(\mathrm{mol} / \mathrm{cm}^{3}\right)

VNV_{N} : Fluid Velocity Normal to the Surface (cm/s)(\mathrm{cm} / \mathrm{s})

VN\left\langle V_{N}\right\rangle : Average Fluid Velocity Normal to the Surface (cm/s)(\mathrm{cm} / \mathrm{s})

KgK_{g} : Effective Mass Transfer Coefficient (cm/s)(\mathrm{cm} / \mathrm{s})

Output(s)

Ua,yU_{a, y}: Diffusion Flux of a Component A in Y\mathrm{Y} direction (mol/cm2 s)\left(\mathrm{mol} / \mathrm{cm}^{2} \mathrm{~s}\right)

Ua,y\left\langle U_{a, y}\right\rangle : Average Diffusion Flux of a Component A in Y direction (mol/cm2 s)\left(\mathrm{mol} / \mathrm{cm}^{2} \mathrm{~s}\right)

Formula(s)

<Ua,y>=DAd<ca>Y+<caVN><Ua,y>=DEd<ca>dY+<ca><VN><Ua,y>=Kg[<ca><ca(w)>]+<ca><VN>\begin{gathered} <U_{a, y}>=-D_{A} \frac{d<c_{a}>}{\partial Y}+<c_{a} V_{N}> \\ <U_{a, y}>=-D_{E} \frac{d<c_{a}>}{d Y}+<c_{a}><V_{N}> \\ <U_{a, y}>=K_{g}\left[<c_{a}>-<c_{a}(w)>\right]+<c_{a}><V_{N}> \end{gathered}

Reference(s)

Williams, B. B., Gidley, J. L., & Schechter, R. S. (1979). Acidizing fundamentals. Henry L. Doherty Memorial Fund of AIME, Society of Petroleum Engineers of AIME, Page 23.


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