# Entropy generation in laminar boundary layers of non-ideal fluid flows

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3 Citations (Scopus)

## Abstract

This paper documents a numerical study on entropy generation in zero-pressure gradient, laminar boundary layers of adiabatic non-ideal compressible fluid flows. The entropy generation is expressed in terms of dissipation coefficient $$C:\mathrm {d}$$ and its dependency on free-stream Mach number, fluid molecular complexity, and flow non-ideality is investigated systematically by means of a boundary layer code extended to treat fluids modeled with arbitrary equations of state. The results of the study show that the trend of dissipation coefficient follows that of an incompressible flow for complex fluid molecules like siloxanes in all thermodynamic and flow conditions. For simpler fluids like CO$$:2$$ the trend becomes inversely proportional to the free-stream Mach number and the $$C:\mathrm {d}$$ value can significantly reduce in the non-ideal flow regime, where strong thermo-physical property gradients occur near the wall.

Original language English Non-Ideal Compressible Fluid Dynamics for Propulsion and Power - Selected Contributions from the 2nd International Seminar on Non-Ideal Compressible Fluid Dynamics for Propulsion and Power, NICFD 2018 Francesca di Mare, Andrea Spinelli, Matteo Pini SpringerOpen 104-117 14 9783030496258 https://doi.org/10.1007/978-3-030-49626-5_8 Published - 2020 2nd International Seminar on Non-Ideal Compressible Fluid Dynamics for Propulsion and Power - Bochum, GermanyDuration: 4 Oct 2018 → 5 Oct 2018Conference number: 2

### Publication series

Name Lecture Notes in Mechanical Engineering 2195-4356 2195-4364

### Conference

Conference 2nd International Seminar on Non-Ideal Compressible Fluid Dynamics for Propulsion and Power NICFD 2018 Germany Bochum 4/10/18 → 5/10/18

### Bibliographical note

Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care
Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.

## Keywords

• Boundary layer
• Dissipation coefficient
• Non-Ideal Compressible Fluid Dynamics
• Organic Rankine cycle
• Supercritical carbon-dioxide

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