Inderscience Publishers

Finite volume computations of convective exergy losses in microfluidic devices

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Exergy losses affect the net power required to transport fluid through microfludic devices. Unlike pressure losses or friction factors, modelling of exergy losses can encompass all types of irreversibilities within a microsystem, including thermofluid, chemical and electromagnetic irreversibilities. In this paper, a finite volume method with a SIMPLEC formulation is developed to predict exergy losses in microchannels. The continuum Navier?Stokes equations are solved numerically with a slip-flow boundary condition. The implications of the two coefficients on exergy destruction, involved in the first-order boundary model, are investigated. By reducing exergy destruction within the microchannel, pressure losses and fluid friction can be minimised to reduce power input and improve overall energy efficiency.

Keywords: exergy losses, non-inverted skew upwind scheme, NISUS, finite volume method, entropy production, exergy destruction, convective exergy, microfluidics, irreversibilities, microchannels, pressure losses, fluid friction, power input, energy efficiency

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