Irreversibility analysis in a slip aided electroosmotic flow through an asymmetrically heated microchannel: The effects of joule heating and the conjugate heat transfer

In this article, we discuss about the entropy generation minimization in a slip-modulated electrically actuated transport through an asymmetrically heated microchannel. While investigating the underlying thermo-hydrodynamics towards minimizing the irreversibility of the system under present consider...

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Bibliographic Details
Published in:Analytica chimica acta 2019-01, Vol.1045, p.85-97
Main Authors: Gaikwad, Harshad Sanjay, Roy, Apurba, Mondal, Pranab Kumar, Chimres, Nares, Wongwises, Somchai
Format: Article
Language:English
Subjects:
Conduction
Conduction heating
Conjugate heat transfer
Conjugates
Electrochemistry
Electroosmosis
Entropy
Fluid dynamics
Fluid flow
Fluid mechanics
Heat exchange
Heat transfer
High temperature effects
Hydrodynamics
Interfacial slip
Irreversibility analysis
Joule heating
Micro heat transfer
Microchannels
Microelectromechanical systems
Ohmic dissipation
Optimization
Parameters
Physical properties
Resistance heating
Slip
Temperature gradients
Thermal asymmetry
Thermohydrodynamics
Transport
Well construction
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Summary:In this article, we discuss about the entropy generation minimization in a slip-modulated electrically actuated transport through an asymmetrically heated microchannel. While investigating the underlying thermo-hydrodynamics towards minimizing the irreversibility of the system under present consideration, we take the combined effects of Joule heating and the conjugate transfer of heat into account in this analysis. We primarily focus to tune the relevant thermo-physical as well as geometrical parameters towards minimizing the global irreversibility of the system. We show that the cooperative-correlative effects of the temperature gradient (between walls and fluid) and viscous dissipation in the system, as modulated by the slipping hydrodynamics stemming from the interfacial electrochemistry and Joule heating effects originating from higher conduction currents, bring in a change in the underlying thermal transport characteristics of heat, leading to an alteration in thermodynamic irreversibility in the system. We unveil optimum values of geometrical and thermo-physical parameters for which a change in thermal transport of heat as triggered by the viscous dissipation and joule heating effect leads to a minimum entropy generation in the system. Moreover, we show that the ionic concentration of the electrolyte present in the fluid can fetch a reduction in the irreversibility as well. We believe that the insights gained from this analysis may be useful for constructing the well-optimized futuristic micro heat exchanging systems/devices, typically used in MEMS. [Display omitted] •Electroosmotic flow through an asymmetrically heated microchannel.•Viscous dissipation as modulated by electrochemistry on the thermohydrodynamics.•Effect of Joule heating on the thermodynamic irreversibility under interfacial slip.•Optimum parameters give rise to a minimum entropy generation in the system.
ISSN:0003-2670
1873-4324
DOI:10.1016/j.aca.2018.08.058