Library Subscription: Guest
Begell Digital Portal Begell Digital Library eBooks Journals References & Proceedings Research Collections
Atomization and Sprays
IF: 1.737 5-Year IF: 1.518 SJR: 0.814 SNIP: 1.18 CiteScore™: 2.2

ISSN Print: 1044-5110
ISSN Online: 1936-2684

Volumes:
Volume 30, 2020 Volume 29, 2019 Volume 28, 2018 Volume 27, 2017 Volume 26, 2016 Volume 25, 2015 Volume 24, 2014 Volume 23, 2013 Volume 22, 2012 Volume 21, 2011 Volume 20, 2010 Volume 19, 2009 Volume 18, 2008 Volume 17, 2007 Volume 16, 2006 Volume 15, 2005 Volume 14, 2004 Volume 13, 2003 Volume 12, 2002 Volume 11, 2001 Volume 10, 2000 Volume 9, 1999 Volume 8, 1998 Volume 7, 1997 Volume 6, 1996 Volume 5, 1995 Volume 4, 1994 Volume 3, 1993 Volume 2, 1992 Volume 1, 1991

Atomization and Sprays

DOI: 10.1615/AtomizSpr.2015013302
pages 551-583

MODELING TEMPERATURE DISTRIBUTION INSIDE AN EMULSION FUEL DROPLET UNDER CONVECTIVE HEATING: A KEY TO PREDICTING MICROEXPLOSION AND PUFFING

Junji Shinjo
Brunel University London
J. Xia
Department of Mechanical, Aerospace and Civil Engineering, and Institute of Energy Futures, Brunel University London, Uxbridge UB8 3PH, United Kingdom
A. Megaritis
Department of Mechanical, Aerospace and Civil Engineering, and Institute of Energy Futures, Brunel University London, Uxbridge UB8 3PH, United Kingdom
L. C. Ganippa
Department of Mechanical, Aerospace and Civil Engineering, and Institute of Energy Futures, Brunel University London, Uxbridge UB8 3PH, United Kingdom
R. F. Cracknell
Shell Global Solutions, Shell Technology Centre Thornton, P.O. Box 1, Chester CH1 3SH, United Kingdom

ABSTRACT

Microexplosion/puffing is rapid disintegration of a water-in-oil emulsion droplet caused by explosive boiling of embedded superheated water sub-droplets. To predict microexplosion/puffing, modeling the temperature distribution inside an emulsion droplet under convective heating is a prerequisite, since the temperature field determines the location of nucleation (vapor bubble initiation from superheated water). In the first part of the present study, convective heating of water-in-oil emulsion droplets under typical combustor conditions is investigated using high-fidelity simulation in order to accurately model inner-droplet temperature distribution. The shear force due to the ambient air flow induces internal circulation inside a droplet. It has been found that for droplets under investigation in the present study, the liquid Peclet number PeL is in a transitional regime of 100 < PeL < 500. The temperature field is therefore somewhat distorted by the velocity field, but the distortion is not strong enough to form Hill's vortex for the temperature field. In the second part of the present study, a novel approach is proposed to model the temperature field distortion by introducing angular dependency of the thermal conductivity and eccentricity of the temperature field. The model can reproduce the main features of the temperature field inside an emulsion droplet, and can be used to predict the nucleation location, which is a key initial condition of microexplosion/puffing.


Articles with similar content:

ANALYSES OF LIQUID AND VAPOR FLOW IN A MINIATURE RADIALLY ROTATING HEAT PIPE FOR TURBINE BLADE COOLING APPLICATIONS
International Heat Transfer Conference 11, Vol.18, 1998, issue
Won Soon Chang, Jian Ling, Yiding Cao
EFFECT OF SOLID SURFACE PROPERTY ON GEOMETRIC VARIATIONS OF MICRO- TO MILLIMETER-SIZED WATER DROPLETS DURING VOLUME REDUCTION PROCESS
Atomization and Sprays, Vol.27, 2017, issue 6
Yukihiro Yonemoto, Tomoaki Kunugi
Self-Aggregation of Vapor-Liquid Phase Transition and Inner Structure of a Boiling Nucleus
ICHMT DIGITAL LIBRARY ONLINE, Vol.2, 2004, issue
Bu-Xuan Wang, Yong Tian, Xiao-Feng Peng, Xiao-Dong Wang
Connection between Energy of EQ Swarm and the Hurst Exponent of Random Variations of the Geomagnetic Field
Telecommunications and Radio Engineering, Vol.58, 2002, issue 9&10
K. Hattori, A. P. Nickolaenko, L. M. Rabinowicz, Masashi Hayakawa
A SPIN COATING DEVICE FOR THE INVESTIGATION OF SPRAY−FILM INTERACTIONS UNDER ENGINE RELEVANT CONDITIONS
Atomization and Sprays, Vol.26, 2016, issue 11
F. Mathieu, Kevin Seel, V. Verbaere, Reinhold Kneer, Wilko Rohlfs, Manuel Armin Reddemann, Herman Haustein, M. Cardenas