A simple model for puffing/micro-explosions in water-fuel emulsion droplets

A new simple model for the puffing/micro-explosion of water-fuel emulsion droplets is suggested. The model is based on the assumption that a spherical water sub-droplet is located in the centre of a larger fuel droplet. The fuel is approximated by n-dodecane. The fuel droplet surface temperature is...

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Main Authors: Sazhin, S.S., Rybdylova, O., Crua, C., Heikal, M., Ismael, M.A., Nissar, Z., Aziz, A.R.B.A.
Format: Article
Institution: Universiti Teknologi Petronas
Record Id / ISBN-0: utp-eprints.22128 /
Published: 2019
Online Access: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85057240802&doi=10.1016%2fj.ijheatmasstransfer.2018.11.065&partnerID=40&md5=96bba8a0e5a7702897139c15c189d099
http://eprints.utp.edu.my/22128/
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spelling utp-eprints.221282019-07-08T07:13:14Z A simple model for puffing/micro-explosions in water-fuel emulsion droplets Sazhin, S.S. Rybdylova, O. Crua, C. Heikal, M. Ismael, M.A. Nissar, Z. Aziz, A.R.B.A. A new simple model for the puffing/micro-explosion of water-fuel emulsion droplets is suggested. The model is based on the assumption that a spherical water sub-droplet is located in the centre of a larger fuel droplet. The fuel is approximated by n-dodecane. The fuel droplet surface temperature is assumed to be fixed, and fuel evaporation is ignored. The heat conduction equation is solved inside this composite droplet with the Dirichlet boundary condition at the surface of the fuel droplet. The time instant when the temperature at the interface between water and fuel reaches the boiling temperature of water is associated with the start of the puffing process leading to micro-explosion. This time is referred to as the time to puffing, or micro-explosion delay time. When the fuel surface temperature is equal to the boiling temperature of fuel then this time is expected to be the shortest of the possible times. The predictions of the model are shown to be in agreement with available experimental data. The model predicts an increase in this time with increase in the fuel droplet size for fixed water and fuel mass fractions, in agreement with observations. © 2018 The Authors 2019 Article PeerReviewed https://www.scopus.com/inward/record.uri?eid=2-s2.0-85057240802&doi=10.1016%2fj.ijheatmasstransfer.2018.11.065&partnerID=40&md5=96bba8a0e5a7702897139c15c189d099 Sazhin, S.S. and Rybdylova, O. and Crua, C. and Heikal, M. and Ismael, M.A. and Nissar, Z. and Aziz, A.R.B.A. (2019) A simple model for puffing/micro-explosions in water-fuel emulsion droplets. International Journal of Heat and Mass Transfer . pp. 815-821. http://eprints.utp.edu.my/22128/
institution Universiti Teknologi Petronas
collection UTP Institutional Repository
description A new simple model for the puffing/micro-explosion of water-fuel emulsion droplets is suggested. The model is based on the assumption that a spherical water sub-droplet is located in the centre of a larger fuel droplet. The fuel is approximated by n-dodecane. The fuel droplet surface temperature is assumed to be fixed, and fuel evaporation is ignored. The heat conduction equation is solved inside this composite droplet with the Dirichlet boundary condition at the surface of the fuel droplet. The time instant when the temperature at the interface between water and fuel reaches the boiling temperature of water is associated with the start of the puffing process leading to micro-explosion. This time is referred to as the time to puffing, or micro-explosion delay time. When the fuel surface temperature is equal to the boiling temperature of fuel then this time is expected to be the shortest of the possible times. The predictions of the model are shown to be in agreement with available experimental data. The model predicts an increase in this time with increase in the fuel droplet size for fixed water and fuel mass fractions, in agreement with observations. © 2018 The Authors
format Article
author Sazhin, S.S.
Rybdylova, O.
Crua, C.
Heikal, M.
Ismael, M.A.
Nissar, Z.
Aziz, A.R.B.A.
spellingShingle Sazhin, S.S.
Rybdylova, O.
Crua, C.
Heikal, M.
Ismael, M.A.
Nissar, Z.
Aziz, A.R.B.A.
A simple model for puffing/micro-explosions in water-fuel emulsion droplets
author_sort Sazhin, S.S.
title A simple model for puffing/micro-explosions in water-fuel emulsion droplets
title_short A simple model for puffing/micro-explosions in water-fuel emulsion droplets
title_full A simple model for puffing/micro-explosions in water-fuel emulsion droplets
title_fullStr A simple model for puffing/micro-explosions in water-fuel emulsion droplets
title_full_unstemmed A simple model for puffing/micro-explosions in water-fuel emulsion droplets
title_sort simple model for puffing/micro-explosions in water-fuel emulsion droplets
publishDate 2019
url https://www.scopus.com/inward/record.uri?eid=2-s2.0-85057240802&doi=10.1016%2fj.ijheatmasstransfer.2018.11.065&partnerID=40&md5=96bba8a0e5a7702897139c15c189d099
http://eprints.utp.edu.my/22128/
_version_ 1741196572636479488
score 11.62408

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