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On the thermodiffusion effect in vertical plate heat exchangers

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Abstract.

The subject of the transport phenomena has a pivotal role in the performance of aqueous lithium bromide falling film absorbers. Although the thermodiffusion phenomenon appears inside the solution, very little is known about its influence on the mass transport. This study numerically analyses the influence of the thermal mass transfer mechanism on a vertical plate-type heat exchanger for different Reynolds numbers (\( 14\leq {\rm Re} \leq 150\)). Results indicate that, in general, the mass transfer caused by the temperature gradient enhances the total absorption because of the negative Soret coefficient of the salt solution. This improvement is found to be higher at higher Reynolds numbers. Furthermore, the concentration and temperature profiles and, therefore, the absorption change significantly along the flow length. Overall, this analysis assists the understanding of the role of the thermal mechanism in this type of absorbers and it demonstrates that it should be considered in future studies.

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Authors and Affiliations

  1. Mondragon Unibertsitatea, Faculty of Engineering, Mechanical and Industrial Production, Loramendi 4, 20500, Mondragon, Gipuzkoa, Spain

    Peru Fernandez de Arroiabe, Manex Martinez-Agirre & M. Mounir Bou-Ali

  2. Tecnalia, Energy and Environment Division, Area Anardi, 5, E-20730, Azpeitia, Gipuzkoa, Spain

    Asier Martinez-Urrutia & Xabier Peña

Authors
  1. Peru Fernandez de Arroiabe
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  2. Asier Martinez-Urrutia
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  3. Xabier Peña
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  4. Manex Martinez-Agirre
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  5. M. Mounir Bou-Ali
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Correspondence to Peru Fernandez de Arroiabe.

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Fernandez de Arroiabe, P., Martinez-Urrutia, A., Peña, X. et al. On the thermodiffusion effect in vertical plate heat exchangers. Eur. Phys. J. E 42, 85 (2019). https://doi.org/10.1140/epje/i2019-11850-7

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