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Updated: Jun 29, 2026

The Diffusion of Passive Tracers in Laminar Shear Flow

The Diffusion of Passive Tracers in Laminar Shear Flow

Published on: May 1, 2018

Rotational hydrodynamic diffusion system to study mass transport across boundaries.

Sai Sree Mamidi¹, Bo Meas, Tarek R Farhat

¹Department of Chemistry, Analytical Division, University of Memphis, Memphis, Tennessee 38152-3550, USA.

Analytical Chemistry

|October 11, 2008

Summary

A new Rotational Hydrodynamic Diffusion System (RHDS) offers enhanced mass transport for laboratory analysis and industrial separation. This technique achieves higher molecular flux across membranes compared to static methods.

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An Analog Macroscopic Technique for Studying Molecular Hydrodynamic Processes in Dense Gases and Liquids

An Analog Macroscopic Technique for Studying Molecular Hydrodynamic Processes in Dense Gases and Liquids

Published on: December 4, 2017

Area of Science:

Mass transport phenomena
Analytical chemistry
Separation science

Background:

Classical mass transport detection methods like static two-half-cell (THC) have limitations.
Existing separation techniques (pressurized, agitated, electrodialysis, reversed osmosis) have distinct theoretical and design principles.
Electrochemical techniques, while informative, do not cover all mass transport studies.

Purpose of the Study:

To introduce and describe the design and operation of a novel mass transport technique: the Rotational Hydrodynamic Diffusion System (RHDS).
To demonstrate RHDS's potential for both analytical laboratory analysis and industrial-scale separation and purification.
To explore RHDS as a viable alternative to existing mass transport detection methods.

Main Methods:

RHDS concept derived from hydrodynamic rotating disk electrode voltammetry.
Theoretical analysis of rotational hydrodynamic flux.
Experimental validation using various ionic solutions (HCl, KCl, KNO 3, Ni(NO 3) 2, LiCl, camphor sulfonic acid, K 3Fe(CN) 6) and ultrathin membranes (Nucleopore, 6.0 and 10 µm thickness, 0.1 and 0.2 µm pore size).

Main Results:

RHDS demonstrates a diffusion advantage, yielding higher probe molecule flux across boundaries with increased rotation rates compared to static THC.
The system's separation concept differs fundamentally from pressurized, agitated, electrodialysis, and reversed osmosis methods.
Effective diffusion coefficients for salts across specified Nucleopore membranes were determined and discussed.

Conclusions:

RHDS presents a novel approach to studying mass transport properties of diverse molecules.
The technique's ability to enhance flux and its distinct separation mechanism make it a promising alternative to classical methods.
RHDS shows potential for broad application in analytical and industrial settings for separation and purification.