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

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

Pini, M. (TU Delft Flight Performance and Propulsion)
de Servi, C.M. (TU Delft Flight Performance and Propulsion; Flemish Institute for Technological Research)

di Mare, Francesca (editor)
Spinelli, Andrea (editor)
Pini, Matteo (editor)

2020

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.

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

http://resolver.tudelft.nl/uuid:3c73bcc8-e5e5-443d-a835-1600ac7c80eb

https://doi.org/10.1007/978-3-030-49626-5_8

SpringerOpen

2021-04-09

9783030496258

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

2nd International Seminar on Non-Ideal Compressible Fluid Dynamics for Propulsion and Power, 2018-10-04 → 2018-10-05, Bochum, Germany

Lecture Notes in Mechanical Engineering, 2195-4356

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.

Institutional Repository

conference paper

© 2020 M. Pini, C.M. de Servi