Schilder, B. ; Yu, S. C. M. ; Kasagi, N. ; Hardt, Steffen ; Stephan, Peter (2008)
Local measurement of forced convection heat transfer in a micro glass tube.
In: ASME 2008 6th International Conference on Nanochannels, Microchannels, and Minichannels
doi: 10.1115/ICNMM2008-62054
Buchkapitel, Bibliographie
Kurzbeschreibung (Abstract)
The pressure drop and the convective heat transfer characteristics of ethanol and water in a 600 \textgreekmm diameter tube with and without phase change has been studied experimentally. The test section consists of a glass tube coated with a transparent ITO (indium tin oxide) heater film. For single phase flow it was found that the measured Nusselt numbers and friction factors are in good agreement with the theoretical values expected from Poiseuille flow. Subsequently, the boiling heat transfer of ethanol was studied. It was found that boiling with bubble growth in both upstream and downstream directions leaving behind a thin evaporating liquid film on the tube wall is the dominant phase change process. Local Nusselt numbers are calculated for the two phase flow at different heat fluxes and Reynolds numbers. Compared to single phase flow the heat transfer is enhanced by a factor of 3 to 8.
| Typ des Eintrags: | Buchkapitel |
|---|---|
| Erschienen: | 2008 |
| Autor(en): | Schilder, B. ; Yu, S. C. M. ; Kasagi, N. ; Hardt, Steffen ; Stephan, Peter |
| Art des Eintrags: | Bibliographie |
| Titel: | Local measurement of forced convection heat transfer in a micro glass tube |
| Sprache: | Englisch |
| Publikationsjahr: | 2008 |
| Verlag: | ASME |
| Buchtitel: | ASME 2008 6th International Conference on Nanochannels, Microchannels, and Minichannels |
| DOI: | 10.1115/ICNMM2008-62054 |
| URL / URN: | http://dx.doi.org/10.1115/ICNMM2008-62054 |
| Kurzbeschreibung (Abstract): | The pressure drop and the convective heat transfer characteristics of ethanol and water in a 600 \textgreekmm diameter tube with and without phase change has been studied experimentally. The test section consists of a glass tube coated with a transparent ITO (indium tin oxide) heater film. For single phase flow it was found that the measured Nusselt numbers and friction factors are in good agreement with the theoretical values expected from Poiseuille flow. Subsequently, the boiling heat transfer of ethanol was studied. It was found that boiling with bubble growth in both upstream and downstream directions leaving behind a thin evaporating liquid film on the tube wall is the dominant phase change process. Local Nusselt numbers are calculated for the two phase flow at different heat fluxes and Reynolds numbers. Compared to single phase flow the heat transfer is enhanced by a factor of 3 to 8. |
| Fachbereich(e)/-gebiet(e): | 16 Fachbereich Maschinenbau 16 Fachbereich Maschinenbau > Fachgebiet für Technische Thermodynamik (TTD) Exzellenzinitiative Exzellenzinitiative > Exzellenzcluster Zentrale Einrichtungen Exzellenzinitiative > Exzellenzcluster > Center of Smart Interfaces (CSI) 16 Fachbereich Maschinenbau > Fachgebiet Nano- und Mikrofluidik (NMF) |
| Hinterlegungsdatum: | 26 Apr 2011 12:05 |
| Letzte Änderung: | 08 Mai 2024 11:16 |
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