Schweizer, N. ; Di Marco, P. ; Stephan, Peter (2011)
Investigation of wall temperature and heat flux distribution during nucleate boiling in the presence of an electric field.
Proceedings 6th International Conference on Two-Phase Systems for Ground and Space Applications.
Konferenzveröffentlichung, Bibliographie
Kurzbeschreibung (Abstract)
Heating wall temperature distribution and bubble shapes were measured during nucleate boiling of FC-72 in microgravity in the presence of an electric field. The presented results are part of the results obtained during the 50th ESA parabolic flight campaign and focused on the electric field experiments. A 25 \textgreekmm stainless steel foil served as heated wall for the boiling process. The temperature distribution of the foil was measured via infrared thermography at a frame rate of 1000 Hz and with a resolution of 30 \textgreekmm/pixel. The bubbles were observed by a synchronized high speed camera. A washer shaped electrode was located parallel to the heated wall. The electrode was charged to up to +10 kV while the heating foil served as ground potential. The effect of the electric field created by this configuration on the boiling process was investigated for different boiling states. Due to the absence of buoyancy in microgravity the bubbles generally do not detach from the heating foil with the given heat fluxes. The electric force on the bubbles generated by the field gradient sucked the vapor through the center hole of the electrode. Thereby, a reliable bubble detachment and re-wetting mechanism could be established and allowed the implementation of a nucleate boiling process in microgravity.
| Typ des Eintrags: | Konferenzveröffentlichung |
|---|---|
| Erschienen: | 2011 |
| Autor(en): | Schweizer, N. ; Di Marco, P. ; Stephan, Peter |
| Art des Eintrags: | Bibliographie |
| Titel: | Investigation of wall temperature and heat flux distribution during nucleate boiling in the presence of an electric field |
| Sprache: | Deutsch |
| Publikationsjahr: | 2011 |
| Veranstaltungstitel: | Proceedings 6th International Conference on Two-Phase Systems for Ground and Space Applications |
| Kurzbeschreibung (Abstract): | Heating wall temperature distribution and bubble shapes were measured during nucleate boiling of FC-72 in microgravity in the presence of an electric field. The presented results are part of the results obtained during the 50th ESA parabolic flight campaign and focused on the electric field experiments. A 25 \textgreekmm stainless steel foil served as heated wall for the boiling process. The temperature distribution of the foil was measured via infrared thermography at a frame rate of 1000 Hz and with a resolution of 30 \textgreekmm/pixel. The bubbles were observed by a synchronized high speed camera. A washer shaped electrode was located parallel to the heated wall. The electrode was charged to up to +10 kV while the heating foil served as ground potential. The effect of the electric field created by this configuration on the boiling process was investigated for different boiling states. Due to the absence of buoyancy in microgravity the bubbles generally do not detach from the heating foil with the given heat fluxes. The electric force on the bubbles generated by the field gradient sucked the vapor through the center hole of the electrode. Thereby, a reliable bubble detachment and re-wetting mechanism could be established and allowed the implementation of a nucleate boiling process in microgravity. |
| Fachbereich(e)/-gebiet(e): | 16 Fachbereich Maschinenbau > Fachgebiet für Technische Thermodynamik (TTD) Exzellenzinitiative > Exzellenzcluster > Center of Smart Interfaces (CSI) 16 Fachbereich Maschinenbau Zentrale Einrichtungen Exzellenzinitiative Exzellenzinitiative > Exzellenzcluster |
| Hinterlegungsdatum: | 17 Mär 2015 14:59 |
| Letzte Änderung: | 17 Mär 2015 14:59 |
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