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Author

E. Teodori

Other affiliations: ASML Holding, University of Lisbon
Bio: E. Teodori is an academic researcher from Instituto Superior Técnico. The author has contributed to research in topics: Boiling & Heat transfer. The author has an hindex of 10, co-authored 26 publications receiving 313 citations. Previous affiliations of E. Teodori include ASML Holding & University of Lisbon.

Papers
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Journal ArticleDOI
TL;DR: In this article, a qualitative and quantitative analysis of the pool boiling heat transfer over micro-structured surfaces is presented, where the surfaces are made from silicon chips, in the context of pool boiling heating transfer enhancement of immersion liquid cooling schemes for electronic components.

60 citations

Journal ArticleDOI
TL;DR: In this paper, a detailed description of the heat transfer and bubble dynamics processes occurring for the boiling of water on surfaces with extreme wetting regimes, namely hydrophilicity and superhydrophobicity, is presented.

60 citations

08 Sep 2015
TL;DR: In this article, a detailed description of the heat transfer and bubble dynamics processes occurring for the boiling of water on surfaces with extreme wetting regimes, namely hydrophilicity and superhydrophobicity, is presented.
Abstract: This study focuses on the detailed description of the heat transfer and bubble dynamics processes occurring for the boiling of water on surfaces with extreme wetting regimes, namely hydrophilicity and superhydrophobicity. The wettability is changed by modifying the surface chemistry and without significant variations in the mean surface roughness. Under these conditions and for the range studied here the effect of the extreme wetting regimes was dominant, thus the influence of surface topography was not addressed. A particular trend is observed for the boiling curve obtained with the superhydrophobic surfaces, as the heat flux increases almost linearly with the superheat, although with a much lower slope than the hydrophilic surfaces. This occurs due to the formation of a large stable vapour film over the entire surface just at around 1 K superheat, because of the almost immediate coalescence of the bubbles generated on the surface. This behaviour agrees with the so-called “quasi-Leidenfrost” regime recently reported in the literature and with a theoretical prediction of the heat flux that is presented in this study. Furthermore, a comprehensive analysis of bubble dynamics, useful for comparison with numerical simulations is given. Such analysis is based on the temporal evolution of the bubble diameter together with bubble contact angle and with the velocity of the contact line. The results suggest that the existing models and correlations can predict the trends of the bubble growth using a modified contact angle value, called the bubble contact angle (or its supplemental value), for the hydrophilic surfaces, even if they cannot accurately predict bubble sizes. Approximating the modified contact angle with the quasi-static contact angle, obtained during surface characterization is practical for a qualitative evaluation, but the results obtained here do not support for its use when estimating the bubble departure diameter. On superhydrophobic surfaces, the effect of the vapour film must be considered, since although this is not the starting point of the boiling process, it represents the actual working conditions when using this kind of surfaces.

57 citations

Journal ArticleDOI
TL;DR: In this article, a systematic analysis of the effect of the geometry of biphilic patterns on bubble dynamics and consequently on the heat transfer processes occurring in pool boiling was performed using synchronized high-speed video and time-resolved thermography.

34 citations

Journal ArticleDOI
TL;DR: In this paper, an innovative analysis of the boiling process from micro-patterned surfaces is proposed, which combines image post-processing with PIV measurements, and the characteristic bubbles velocity obtained by PIV measurement evidences that the optimal pattern which balances the positive effect of increasing the parcel of liquid evaporation and the negative effect of the horizontal coalescence also allows a more stable vertical bubble velocity, thus removing the vapor from the surface.

31 citations


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01 Aug 1953
TL;DR: In this paper, a solution for the radius of the vapor bubble as a function of time is obtained which is valid for sufficiently large radius, since the radius at which it becomes valid is near the lower limit of experimental observation.
Abstract: The growth of a vapor bubble in a superheated liquid is controlled by three factors: the inertia of the liquid, the surface tension, and the vapor pressure. As the bubble grows, evaporation takes place at the bubble boundary, and the temperature and vapor pressure in the bubble are thereby decreased. The heat inflow requirement of evaporation, however, depends on the rate of bubble growth, so that the dynamic problem is linked with a heat diffusion problem. Since the heat diffusion problem has been solved, a quantitative formulation of the dynamic problem can be given. A solution for the radius of the vapor bubble as a function of time is obtained which is valid for sufficiently large radius. This asymptotic solution covers the range of physical interest since the radius at which it becomes valid is near the lower limit of experimental observation. It shows the strong effect of heat diffusion on the rate of bubble growth. Comparison of the predicted radius‐time behavior is made with experimental observations in superheated water, and very good agreement is found.

729 citations

Journal ArticleDOI
TL;DR: In this paper, a comprehensive review of published articles addressing passive enhancement of pool boiling using surface modification techniques is provided, including macroscale, microscale, and nanoscale surfaces, as well as multiscale (hybrid-scale), and hybrid-wettability techniques.

343 citations

Journal ArticleDOI
TL;DR: In this paper, the results reported in recent investigations on pool boiling and flow boiling from micro/nanostructured surfaces were included, and a comprehensive overview was provided. But, the results of these studies were limited to the micro and nano scale.

179 citations

Journal ArticleDOI
TL;DR: In this article, the effect of surface roughness on pool boiling heat transfer coefficient and critical heat flux (CHF) at a copper surface having moderate wettability was studied in saturated water.

155 citations

Journal ArticleDOI
TL;DR: In this article, the results of an experimental investigation on the saturated pool boiling heat transfer performances of microstructured surfaces fabricated by the Selective Laser Melting (SLM) technique were presented.

104 citations