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

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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 languageEnglish
Title of host publicationNon-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
EditorsFrancesca di Mare, Andrea Spinelli, Matteo Pini
PublisherSpringer Open
Pages104-117
Number of pages14
ISBN (Print)9783030496258
DOIs
Publication statusPublished - 2020
Event2nd International Seminar on Non-Ideal Compressible Fluid Dynamics for Propulsion and Power, NICFD 2018 - Bochum, Germany
Duration: 4 Oct 20185 Oct 2018

Publication series

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

Conference

Conference2nd International Seminar on Non-Ideal Compressible Fluid Dynamics for Propulsion and Power, NICFD 2018
CountryGermany
CityBochum
Period4/10/185/10/18

Keywords

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

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  • 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). Springer Open. https://doi.org/10.1007/978-3-030-49626-5_8