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Título del libro: Asme International Mechanical Engineering Congress And Exposition, Proceedings (imece)
Título del capítulo: Second law analysis for a mixed electro-osmotic and pressure driven flow of a viscoelastic fluid in a micro-channel

Autores UNAM:
FEDERICO MENDEZ LAVIELLE;
Autores externos:

Idioma:
Inglés
Año de publicación:
2012
Palabras clave:

Conjugate heat transfer problem; Conjugated heat transfer; Dimensionless parameters; Dimensionless temperatures; Electroosmotic flow; Entropy generation; Phan-thien-tanner; Visco-elastic parameters; Entropy; Mechanical engineering; Non Newtonian liquids; Electroosmosis


Resumen:

In this work the entropy generation rate in a parallel flat plate micro-channel under mixed electro-osmotic and pressure driven flow with a non-Newtonian fluid is analyzed. A fully developed flow is considered and the fluid obeys a constitutive relation based in a simplified Phan-Thien-Tanner model. The temperature distributions of a conjugate heat transfer problem in the micro-channel were solved asymptotically in steady-state, then, expressions for dimensionless local and average entropy generation rate are obtained. The aim of this paper is to show the influence of dimensionless parameters involved on the entropy generation rate : The viscoelastic parameter, the ratio of pressure forces to electro-osmotic forces, the ?eclet number, the normalized power generation term, the dimensionless temperature difference, the ratio of micro-channel thickness to length, the ratio of micro-channel wall thickness to length and the conjugation parameter; this set of parameters controls directly the thermal performance of this micro-channel. We can predict that the entropy generation rate is basically dominated by the Joule heating effect. Copyright © 2012 by ASME.


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