Heat and mass transfer and thermodynamic analysis of power-law fluid flow in a porous microchannel

Autor:	Nader Karimi, Mostafa Valizadeh Ardalan, A. Fattahi, Mahnaz Javidi Sarafan, Rasool Alizadeh
Rok vydání:	2020
Předmět:	Finite volume method Microchannel Materials science Power-law fluid 020209 energy 02 engineering and technology Mechanics 021001 nanoscience & nanotechnology Condensed Matter Physics Nusselt number Physics::Fluid Dynamics Mass transfer Heat transfer 0202 electrical engineering electronic engineering information engineering Working fluid Physical and Theoretical Chemistry Microreactor 0210 nano-technology
Zdroj:	Journal of Thermal Analysis and Calorimetry. 141:2145-2164
ISSN:	1588-2926 1388-6150
DOI:	10.1007/s10973-020-09679-8
Popis:	Transfer of heat and mass and thermodynamic irreversibilities are investigated in a porous, parallel-plate microreactor in which the working fluid is non-Newtonian. The investigated microreactor features thick flat walls with uneven thicknesses, which can be subject to different thermal loads. The dimensionless governing equations of the resultant asymmetric problem are first derived theoretically and then solved numerically by using a finite volume technique. This results in two-dimensional solutions for the velocity, temperature and concentration fields as well as the distributions of Nusselt number and local and total entropy generations. The results clearly demonstrate the significance of the numerical value of the power-law index and departure from Newtonian behavior of the fluid. In particular, it is shown that by increasing the value of power-law index the Nusselt number on the wall decreases. This leads to the intensification of the temperature gradients in the system and therefore magnifies the local and total entropy generations. Also, it is shown that the wall thickness and thermal asymmetry can majorly affect the heat transfer process and thermodynamic irreversibility of the microreactor. It is noted that the current work is the first comprehensive study of heat transfer and entropy generation in porous micro-chemical reactor with non-Newtonian, power-law fluid.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b564c19f9dcb1480a23155e67854a497 https://doi.org/10.1007/s10973-020-09679-8 Zobrazit plný text záznamu Plný text ve formátu PDF Plný text ve formátu HTML
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