What Exactly is the Nusselt Number in Convective Heat Transfer Problems and are There Alternatives?
The often used Nusselt number is critically questioned with respect to its physical meaning. Based on a rigorous dimensional analysis, alternative assessment numbers are found that in a systematic way separately account for the quantitative and qualitative aspect of a heat transfer process. The qual...
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| Format: | Article |
| Language: | English |
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MDPI AG
2016-05-01
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| Series: | Entropy |
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| Online Access: | http://www.mdpi.com/1099-4300/18/5/198 |
| _version_ | 1811184030296571904 |
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| author | Heinz Herwig |
| author_facet | Heinz Herwig |
| author_sort | Heinz Herwig |
| collection | DOAJ |
| description | The often used Nusselt number is critically questioned with respect to its physical meaning. Based on a rigorous dimensional analysis, alternative assessment numbers are found that in a systematic way separately account for the quantitative and qualitative aspect of a heat transfer process. The qualitative aspect is related to the entropy generated in the temperature field of a real, irreversible heat transfer. The irreversibility can be quantified by referring it to the so-called entropic potential of the energy involved in the transfer process. |
| first_indexed | 2024-04-11T13:07:22Z |
| format | Article |
| id | doaj.art-b9d42898103b40fda2aff8a40c939a8b |
| institution | Directory Open Access Journal |
| issn | 1099-4300 |
| language | English |
| last_indexed | 2024-04-11T13:07:22Z |
| publishDate | 2016-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Entropy |
| spelling | doaj.art-b9d42898103b40fda2aff8a40c939a8b2022-12-22T04:22:42ZengMDPI AGEntropy1099-43002016-05-0118519810.3390/e18050198e18050198What Exactly is the Nusselt Number in Convective Heat Transfer Problems and are There Alternatives?Heinz Herwig0Institute for Thermo-Fluid Dynamics, Hamburg University of Technology, 21073 Hamburg, GermanyThe often used Nusselt number is critically questioned with respect to its physical meaning. Based on a rigorous dimensional analysis, alternative assessment numbers are found that in a systematic way separately account for the quantitative and qualitative aspect of a heat transfer process. The qualitative aspect is related to the entropy generated in the temperature field of a real, irreversible heat transfer. The irreversibility can be quantified by referring it to the so-called entropic potential of the energy involved in the transfer process.http://www.mdpi.com/1099-4300/18/5/198dimensional analysisenergy devaluationentropic potential |
| spellingShingle | Heinz Herwig What Exactly is the Nusselt Number in Convective Heat Transfer Problems and are There Alternatives? Entropy dimensional analysis energy devaluation entropic potential |
| title | What Exactly is the Nusselt Number in Convective Heat Transfer Problems and are There Alternatives? |
| title_full | What Exactly is the Nusselt Number in Convective Heat Transfer Problems and are There Alternatives? |
| title_fullStr | What Exactly is the Nusselt Number in Convective Heat Transfer Problems and are There Alternatives? |
| title_full_unstemmed | What Exactly is the Nusselt Number in Convective Heat Transfer Problems and are There Alternatives? |
| title_short | What Exactly is the Nusselt Number in Convective Heat Transfer Problems and are There Alternatives? |
| title_sort | what exactly is the nusselt number in convective heat transfer problems and are there alternatives |
| topic | dimensional analysis energy devaluation entropic potential |
| url | http://www.mdpi.com/1099-4300/18/5/198 |
| work_keys_str_mv | AT heinzherwig whatexactlyisthenusseltnumberinconvectiveheattransferproblemsandaretherealternatives |