Publication

The influence of viscosity on the liquid-phase mass transfer resistance in packed columns

Urs von Stockar
1991
Journal Articles

Abstract

The correlations available in the literature cannot be used to est. the liq.-phase mass-transfer coeff. (kL) for viscous solns. Even correlations that agree for water-like viscosities diverge by an order of magnitude for viscosities of only 10 mPa-s. Here, kL (kLa) measurements are given that are performed by stripping O from aq. solns. in a column of 0.3-m diam. filled with 0.025-m glass Raschig rings. The viscosity is varied by varying the amt. of Na alginate, glycerol, or polyethylene glycol in the water. The viscosity not only has an effect on the diffusivity of the absorbed gas (this highlights the importance of accurate diffusivity estns., both for data interpretation and for design work), but also has an addnl. net effect such that kLa/D1/2 (D = diffusivity of solute in liq.) decreases in approx. inverse proportion to the square root of the viscosity. [on SciFinder (R)]

Official source

https://infoscience.epfl.ch/entities/publication/9a0aacc3-7886-4514-94fe-e6a557e75108

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Urs von Stockar
1991
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/9a0aacc3-7886-4514-94fe-e6a557e75108

About this result

Related concepts (32)

Fractionating column

A fractionating column or fractional column is equipment used in the distillation of liquid mixtures to separate the mixture into its component parts, or fractions, based on the differences in volatilities. Fractionating columns are used in small-scale laboratory distillations as well as large-scale industrial distillations. A laboratory fractionating column is a piece of glassware used to separate vaporized mixtures of liquid compounds with close volatility.

Raschig ring

Raschig rings are pieces of tube, approximately equal in length and diameter, used in large numbers as a packed bed within columns for distillations and other chemical engineering processes. They are usually ceramic, metal or glass and provide a large surface area within the volume of the column for interaction between liquid and gas vapours. Raschig rings are named after their inventor, German chemist Friedrich Raschig, who patented them in 1914.

Square root

In mathematics, a square root of a number x is a number y such that ; in other words, a number y whose square (the result of multiplying the number by itself, or ) is x. For example, 4 and −4 are square roots of 16 because . Every nonnegative real number x has a unique nonnegative square root, called the principal square root, which is denoted by where the symbol "" is called the radical sign or radix. For example, to express the fact that the principal square root of 9 is 3, we write .

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The influence of viscosity on the liquid-phase mass transfer resistance in packed columns

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