We have developed a new calculation method to estimate the time delay in a liquid drain from a tank through a tube. The method uses the Newton iterative technique to calculate the velocity of the liquid and the flow rate in the tube, with an average deviation of 14 percent from the time of experimental drainage.

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Se ha desarrollado un nuevo método de cálculo para estimar el tiempo que un liquido demora en escurrir por un tanque a través de un tubo. El método utiliza la técnica iterativa de Newton para calcular la velocidad del liquido y el régimen de flujo en el tubo, con una desviación promedio de 14 por ciento respecto al tíempo de drenado experimental.

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In the present work is evaluated an applicable mathematical model to the separations by ion-exchange chromatography of ions monovalents in aqueous solutions, being determined the parameters of the model as of gathered experimental data of the bibliography and data simulated with mean zero and standard deviation of 0.05. It has been found that for ions monovalents such as sodium, potassium, chloride, iodur and bromide the percent variations of the parameters are < ±5%, < ±35% and < ±147% for the reduced speed of the fluid, the coefficient of reduced axial dispersion and that of deviation with respect to a linear isothermal respectively; they with 97.5 percent certainty.

In the present work is evaluated an applicable mathematical model to the separations by ion-exchange chromatography of ions monovalents in aqueous solutions, being determined the parameters of the model as of gathered experimental data of the bibliography and data simulated with mean zero and standard deviation of 0.05. It has been found that for ions monovalents such as sodium, potassium, chloride, iodur and bromide the percent variations of the parameters are < ±5%, < ±35% and < ±147% for the reduced speed of the fluid, the coefficient of reduced axial dispersion and that of deviation with respect to a linear isothermal respectively; they with 97.5 percent certainty.