New models for adiabatic and isentropic flow description in tubular friction and adiabatic exponent generalization.
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| Title: | New models for adiabatic and isentropic flow description in tubular friction and adiabatic exponent generalization. |
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| Authors: | Sánta, R.1,2 (AUTHOR) santar@uniduna.hu, Garbai, L.3 (AUTHOR) |
| Source: | Journal of Thermal Analysis & Calorimetry. Dec2024, Vol. 149 Issue 24, p14781-14789. 9p. |
| Subjects: | Adiabatic flow, Fluid friction, Fluid mechanics, Ideal gases, Thermal expansion, Internal friction |
| Abstract: | In practical fluid mechanics, in terms of tube flow description, there is a lack of analytical descriptions and solutions of frictional adiabatic and isentropic flow. This paper explores the connections between the modeling these two flow types and reveals that frictional isentropic flow can be achieved if the heat generated by friction is removed from the flow. This is, in fact, a polytropic flow, which is made isentropic by heat extraction. The study also presents a new description and solution of adiabatic flow, which is not isentropic due to friction, but no heat loss is considered in this work. Adiabatic frictional flow is implemented by extending the application of the adiabatic exponent (k). The adiabatic exponent (k) is naturally used to describe the isentropic or adiabatic state changes of ideal gases. During adiabatic state changes, the entropy of the ideal gas remains unchanged if the state change occurs without internal friction, without internal thermal expansion and without external energy absorption or loss. This means it is no longer an isentropic change of state if there is internal friction in the fluid. The adiabatic change of state without external heat input is therefore not necessarily isentropic. In common terms, a distinction is not always made between adiabatic and isentropic state changes. This paper expands on the use of the adiabatic exponent to describe frictional flows. Further, the paper outlines the possibility of using the exponent k to describe polytropic flows, which, of course, are by no means isentropic, but can be made mathematically so if one can compensate for internal heat generation by external heat extraction. [ABSTRACT FROM AUTHOR] |
| Copyright of Journal of Thermal Analysis & Calorimetry is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
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| Header | DbId: egs DbLabel: Engineering Source An: 181927194 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: New models for adiabatic and isentropic flow description in tubular friction and adiabatic exponent generalization. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Sánta%2C+R%2E%22">Sánta, R.</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> santar@uniduna.hu</i><br /><searchLink fieldCode="AR" term="%22Garbai%2C+L%2E%22">Garbai, L.</searchLink><relatesTo>3</relatesTo> (AUTHOR) – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Journal+of+Thermal+Analysis+%26+Calorimetry%22">Journal of Thermal Analysis & Calorimetry</searchLink>. Dec2024, Vol. 149 Issue 24, p14781-14789. 9p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Adiabatic+flow%22">Adiabatic flow</searchLink><br /><searchLink fieldCode="DE" term="%22Fluid+friction%22">Fluid friction</searchLink><br /><searchLink fieldCode="DE" term="%22Fluid+mechanics%22">Fluid mechanics</searchLink><br /><searchLink fieldCode="DE" term="%22Ideal+gases%22">Ideal gases</searchLink><br /><searchLink fieldCode="DE" term="%22Thermal+expansion%22">Thermal expansion</searchLink><br /><searchLink fieldCode="DE" term="%22Internal+friction%22">Internal friction</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: In practical fluid mechanics, in terms of tube flow description, there is a lack of analytical descriptions and solutions of frictional adiabatic and isentropic flow. This paper explores the connections between the modeling these two flow types and reveals that frictional isentropic flow can be achieved if the heat generated by friction is removed from the flow. This is, in fact, a polytropic flow, which is made isentropic by heat extraction. The study also presents a new description and solution of adiabatic flow, which is not isentropic due to friction, but no heat loss is considered in this work. Adiabatic frictional flow is implemented by extending the application of the adiabatic exponent (k). The adiabatic exponent (k) is naturally used to describe the isentropic or adiabatic state changes of ideal gases. During adiabatic state changes, the entropy of the ideal gas remains unchanged if the state change occurs without internal friction, without internal thermal expansion and without external energy absorption or loss. This means it is no longer an isentropic change of state if there is internal friction in the fluid. The adiabatic change of state without external heat input is therefore not necessarily isentropic. In common terms, a distinction is not always made between adiabatic and isentropic state changes. This paper expands on the use of the adiabatic exponent to describe frictional flows. Further, the paper outlines the possibility of using the exponent k to describe polytropic flows, which, of course, are by no means isentropic, but can be made mathematically so if one can compensate for internal heat generation by external heat extraction. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Journal of Thermal Analysis & Calorimetry is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1007/s10973-024-13704-5 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 9 StartPage: 14781 Subjects: – SubjectFull: Adiabatic flow Type: general – SubjectFull: Fluid friction Type: general – SubjectFull: Fluid mechanics Type: general – SubjectFull: Ideal gases Type: general – SubjectFull: Thermal expansion Type: general – SubjectFull: Internal friction Type: general Titles: – TitleFull: New models for adiabatic and isentropic flow description in tubular friction and adiabatic exponent generalization. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Sánta, R. – PersonEntity: Name: NameFull: Garbai, L. IsPartOfRelationships: – BibEntity: Dates: – D: 15 M: 12 Text: Dec2024 Type: published Y: 2024 Identifiers: – Type: issn-print Value: 13886150 Numbering: – Type: volume Value: 149 – Type: issue Value: 24 Titles: – TitleFull: Journal of Thermal Analysis & Calorimetry Type: main |
| ResultId | 1 |
