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Titolo:
An investigation of microscale explosive vaporization of water on an ultrathin Pt wire
Autore:
Glod, S; Poulikakos, D; Zhao, Z; Yadigaroglu, G;
Indirizzi:
ETH Zurich, ETH Zentrum, Inst Energy Technol, Lab Thermodynam Emerging Technol, CH-8092 Zurich, Switzerland ETH Zurich Zurich Switzerland CH-8092 chnol, CH-8092 Zurich, Switzerland ETH Zurich, Inst Energy Technol, Nucl Engn Lab, CH-8092 Zurich, Switzerland ETH Zurich Zurich Switzerland CH-8092 n Lab, CH-8092 Zurich, Switzerland
Titolo Testata:
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
fascicolo: 2, volume: 45, anno: 2002,
pagine: 367 - 379
SICI:
0017-9310(200201)45:2<367:AIOMEV>2.0.ZU;2-O
Fonte:
ISI
Lingua:
ENG
Soggetto:
BUBBLE NUCLEATION; GENERATION; TEMPERATURE; PRESSURE; SURFACE; LIQUIDS;
Keywords:
bubble growth; microscale; non-equilibrium;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Engineering, Computing & Technology
Citazioni:
29
Recensione:
Indirizzi per estratti:
Indirizzo: Poulikakos, D ETH Zurich, ETH Zentrum, Inst Energy Technol, Lab Thermodynam Emerging Technol, CH-8092 Zurich, Switzerland ETH Zurich Zurich Switzerland CH-8092 Zurich, Switzerland
Citazione:
S. Glod et al., "An investigation of microscale explosive vaporization of water on an ultrathin Pt wire", INT J HEAT, 45(2), 2002, pp. 367-379

Abstract

The explosive vaporization of water close to its superheat limit was investigated at the microscale level using a short (I mm in length) and ultrathin (10 mum in diameter) Pt wire. It was possible to obtain novel visualizations and simultaneously pressure and temperature measurements in the vapor microregion, thus accomplishing a step forward in understanding the complex behavior of explosive vapor nucleation, growth, and subsequent collapse, despite experimental difficulties posed by the very short time and length scales of the phenomena. The temperature results verify (to the best of our knowledge, for the first time) the limit of superheat reported in the classical work of Skripov. The nucleation temperature increases with heating rate until a maximum limit is reached. The maximum heating rate was 86 x 10(6) K/s and a maximum nucleation temperature of 303 degreesC could be obtained. For the visualization of the very rapid boiling process, a strobe microscopy technique was developed and employed. A clear difference in the mode (homogeneous vs. heterogeneous) of vapor nucleation between high and moderate heating rates was observed. A fast pressure transducer allowed to capture the acoustic emission from the expanding vapor volume. From these data, the pressure inside the growing vapor layer and the mechanical energy released by its rapid expansion could be estimated. (C) 2001 Published by Elsevier Science Ltd.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 29/03/20 alle ore 15:32:34