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Updated: Sep 15, 2025

The Diffusion of Passive Tracers in Laminar Shear Flow
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Mass transport in LiBr-H2O solutions: Coupling between diffusion, thermodiffusion, and composition.

I C Perez de Luco1, A Errarte1, P F Arroiabe1

  • 1Fluid Mechanics Group, Faculty of Engineering, Mondragon University, 20500 Mondragon, Spain.

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|July 15, 2025
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Summary

This study reveals how lithium bromide (LiBr) moves in water, showing diffusion peaks and thermophilic behavior where LiBr moves to warmer areas. Understanding these transport phenomena is key for applications.

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Area of Science:

  • Physical Chemistry
  • Solution Thermodynamics
  • Mass Transport Phenomena

Background:

  • Aqueous solutions of lithium bromide (LiBr-H2O) are crucial in various industrial applications, necessitating a deep understanding of their transport properties.
  • Molecular diffusion and thermodiffusion (Soret effect) are key phenomena governing mass transport in these solutions, but their concentration dependence is not fully elucidated.

Purpose of the Study:

  • To experimentally investigate mass transport phenomena, specifically molecular diffusion and thermodiffusion, in aqueous lithium bromide solutions.
  • To characterize the concentration dependence of the diffusion coefficient (D) and Soret coefficient (ST).
  • To analyze the interplay between molecular mobility and solution structure in determining transport behavior.

Main Methods:

  • Experimental measurements of diffusion coefficients using standard techniques.
  • Thermogradient measurements in a Soret cell containing porous media to determine Soret coefficients.
  • Systematic variation of LiBr mass fraction (w) to study concentration effects.

Main Results:

  • A non-monotonic trend in the diffusion coefficient (D) was observed, exhibiting a distinct maximum around w ≈ 0.3 kg/kg LiBr.
  • Consistently negative Soret coefficients (ST) were measured across the studied concentration range, indicating thermophilic behavior (LiBr migration towards warmer regions).
  • The absolute value of the thermodiffusion coefficient (|DT|) decreased with increasing concentration, while the magnitude of the Soret coefficient (|ST|) increased due to a more significant reduction in molecular diffusion.

Conclusions:

  • The observed diffusion behavior suggests microstructural transitions within the LiBr-H2O solution.
  • The thermophilic nature of LiBr in water is confirmed, with migration influenced by temperature gradients.
  • Both molecular diffusion and the underlying solution structure are critical factors for accurately modeling mass transport in LiBr-H2O systems.