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

Matteo Pini; Carlo De Servi

doi:10.1007/978-3-030-49626-5_8

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

^*Corresponding author for this work

Flight Performance and Propulsion

Research output: Chapter in Book/Conference proceedings/Edited volume › Conference contribution › Scientific › peer-review

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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
Title of host publication	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
Editors	Francesca di Mare, Andrea Spinelli, Matteo Pini
Publisher	SpringerOpen
Pages	104-117
Number of pages	14
ISBN (Print)	9783030496258
DOIs	https://doi.org/10.1007/978-3-030-49626-5_8
Publication status	Published - 2020
Event	2nd International Seminar on Non-Ideal Compressible Fluid Dynamics for Propulsion and Power - Bochum, Germany Duration: 4 Oct 2018 → 5 Oct 2018 Conference number: 2

Publication series

Name	Lecture Notes in Mechanical Engineering
ISSN (Print)	2195-4356
ISSN (Electronic)	2195-4364

Conference

Conference	2nd International Seminar on Non-Ideal Compressible Fluid Dynamics for Propulsion and Power
Abbreviated title	NICFD 2018
Country/Territory	Germany
City	Bochum
Period	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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10.1007/978-3-030-49626-5_8

Pini_Servi2020_Chapter_EntropyGenerationInLaminarBounFinal published version, 624 KB

Cite this

Pini, M., & De Servi, C. (2020). Entropy generation in laminar boundary layers of non-ideal fluid flows. In F. di Mare, A. Spinelli, & M. Pini (Eds.), 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 (pp. 104-117). (Lecture Notes in Mechanical Engineering). SpringerOpen. https://doi.org/10.1007/978-3-030-49626-5_8

Pini, Matteo ; De Servi, Carlo. / Entropy generation in laminar boundary layers of non-ideal fluid flows. 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. editor / Francesca di Mare ; Andrea Spinelli ; Matteo Pini. SpringerOpen, 2020. pp. 104-117 (Lecture Notes in Mechanical Engineering).

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title = "Entropy generation in laminar boundary layers of non-ideal fluid flows",

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.",

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Pini, M & De Servi, C 2020, Entropy generation in laminar boundary layers of non-ideal fluid flows. in F di Mare, A Spinelli & M Pini (eds), 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. Lecture Notes in Mechanical Engineering, SpringerOpen, pp. 104-117, 2nd International Seminar on Non-Ideal Compressible Fluid Dynamics for Propulsion and Power, Bochum, Germany, 4/10/18. https://doi.org/10.1007/978-3-030-49626-5_8

Entropy generation in laminar boundary layers of non-ideal fluid flows. / Pini, Matteo ; De Servi, Carlo.
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. ed. / Francesca di Mare; Andrea Spinelli; Matteo Pini. SpringerOpen, 2020. p. 104-117 (Lecture Notes in Mechanical Engineering).

Research output: Chapter in Book/Conference proceedings/Edited volume › Conference contribution › Scientific › peer-review

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T1 - Entropy generation in laminar boundary layers of non-ideal fluid flows

AU - Pini, Matteo

AU - De Servi, Carlo

N1 - Conference code: 2

PY - 2020

Y1 - 2020

N2 - 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.

AB - 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.

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KW - Supercritical carbon-dioxide

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ER -

Pini M , De Servi C. Entropy generation in laminar boundary layers of non-ideal fluid flows. In di Mare F, Spinelli A, Pini M, editors, 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. SpringerOpen. 2020. p. 104-117. (Lecture Notes in Mechanical Engineering). doi: 10.1007/978-3-030-49626-5_8

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

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