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Experimental investigation on the influence of Ethanol/Water mixtures on microstructure surfaces during nucleate boiling

Xanthopoulou, Yiota ; Sielaff, Axel ; Stephan, Peter (2023)
Experimental investigation on the influence of Ethanol/Water mixtures on microstructure surfaces during nucleate boiling.
17th International Heat Transfer Conference. Cape Town, South Africa (14.-18.08.2023)
doi: 10.1615/IHTC17.360-20
Conference or Workshop Item, Bibliographie

Abstract

Extensive research has been conducted on nucleate pool boiling over the past few decades, investigating numerous parameters, such as the use of different fluids and boiling surfaces. Despite all these studies, the complex phenomenological interactions between solids and fluids are still poorly understood. There is still a need to study specific combinations of complex fluids and complex surfaces. This experimental study focuses on analyzing the influence of a microstructured surface on boiling phenomena. Here, the microstructured surface consists of copper with striped areas of microneedles alternating with smooth striped areas. This hybrid structure is intended to provide a compromise between good nucleation and bubble growth and good vapor removal. For comparative purposes, a completely smooth copper surface is investigated too. Pure ethanol and a 10% ethanol-water mixture are used as fluids at two different system pressures of 0.5 bar and 1 bar. To analyze the heat transfer coefficient and the critical heat flux, temperatures at the heated surface and in the fluid, as well as heat fluxes, are measured with high resolution. The results with pure ethanol show that the heat transfer coefficient and the critical heat flux are higher when using the hybrid microstructured surface. When using the mixture, the microstructure only favors the heat transfer coefficient but not the critical heat flux density.

Item Type: Conference or Workshop Item
Erschienen: 2023
Creators: Xanthopoulou, Yiota ; Sielaff, Axel ; Stephan, Peter
Type of entry: Bibliographie
Title: Experimental investigation on the influence of Ethanol/Water mixtures on microstructure surfaces during nucleate boiling
Language: English
Date: 2023
Place of Publication: Cape Town, South Africa
Collation: 11 Seiten
Event Title: 17th International Heat Transfer Conference
Event Location: Cape Town, South Africa
Event Dates: 14.-18.08.2023
DOI: 10.1615/IHTC17.360-20
Abstract:

Extensive research has been conducted on nucleate pool boiling over the past few decades, investigating numerous parameters, such as the use of different fluids and boiling surfaces. Despite all these studies, the complex phenomenological interactions between solids and fluids are still poorly understood. There is still a need to study specific combinations of complex fluids and complex surfaces. This experimental study focuses on analyzing the influence of a microstructured surface on boiling phenomena. Here, the microstructured surface consists of copper with striped areas of microneedles alternating with smooth striped areas. This hybrid structure is intended to provide a compromise between good nucleation and bubble growth and good vapor removal. For comparative purposes, a completely smooth copper surface is investigated too. Pure ethanol and a 10% ethanol-water mixture are used as fluids at two different system pressures of 0.5 bar and 1 bar. To analyze the heat transfer coefficient and the critical heat flux, temperatures at the heated surface and in the fluid, as well as heat fluxes, are measured with high resolution. The results with pure ethanol show that the heat transfer coefficient and the critical heat flux are higher when using the hybrid microstructured surface. When using the mixture, the microstructure only favors the heat transfer coefficient but not the critical heat flux density.

Divisions: 16 Department of Mechanical Engineering
16 Department of Mechanical Engineering > Institute for Technical Thermodynamics (TTD)
DFG-Collaborative Research Centres (incl. Transregio)
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 1194: Interaction between Transport and Wetting Processes
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 1194: Interaction between Transport and Wetting Processes > Research Area C: New and Improved Applications
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 1194: Interaction between Transport and Wetting Processes > Research Area C: New and Improved Applications > C02: Multiscale Investigations of Boiling of Complex Fluids on Complex Surfaces
Date Deposited: 27 Nov 2023 09:31
Last Modified: 07 Dec 2023 08:32
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