File Download

There are no files associated with this item.

  Links for fulltext
     (May Require Subscription)
Supplementary

Article: Non-Fourier heat conduction in oil-in-water emulsions

TitleNon-Fourier heat conduction in oil-in-water emulsions
Authors
KeywordsO/W emulsions
Non-Fourier heat conduction
Extraordinary effective thermal conductivity
Time lag ratio
Issue Date2019
PublisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/ijhmt
Citation
International Journal of Heat and Mass Transfer, 2019, v. 135, p. 323-330 How to Cite?
AbstractEmulsions have widely been used in various application, e.g. in energy system as a potential second refrigerant. However, there is a lack of comprehensive study on extraordinary effective thermal conductivity enhancement in the oil-in-water (O/W) emulsions, and effects of temperature and droplet size were not considered in the widely used models of effective thermal conductivity for the O/W emulsions. In this study, non-Fourier heat conduction characteristics in the O/W emulsions were investigated experimentally. The O/W emulsions were prepared with different droplet sizes by controlling the ultrasonic processing time. The O/W emulsions containing small droplets are stable. Effective thermal conductivity of O/W emulsions nonlinearly varies with droplet size, concentration, fluid properties and temperature. Small droplet size is beneficial for effective thermal conductivity enhancement of O/W emulsions. Thermal conductivity of fluids can be enhanced significantly especially at low concentration although thermal conductivity of oil is much lower than water conductivity, which could be due to non-Fourier heat conductions in O/W emulsions. Time lag ratio less than 1 indicates that no thermal waves exist in O/W emulsions, and diffusion-dominant non-Fourier heat conduction could exist in the O/W emulsions. A new model of effective thermal conductivity, which considers effects of fluid thermosphysical properties, oil concentration, droplet size and temperature, was developed for the O/W emulsions based on the measured data. This study could be helpful for exploring the mechanisms behind extraordinary heat conductivity enhancement phenomena of oil-in-water emulsions.
Persistent Identifierhttp://hdl.handle.net/10722/293383
ISSN
2019 Impact Factor: 4.947
2015 SCImago Journal Rankings: 1.749

 

DC FieldValueLanguage
dc.contributor.authorLiu, F-
dc.contributor.authorChen, Q-
dc.contributor.authorKANG, Z-
dc.contributor.authorPan, W-
dc.contributor.authorZhang, D-
dc.contributor.authorWang, L-
dc.date.accessioned2020-11-23T08:15:57Z-
dc.date.available2020-11-23T08:15:57Z-
dc.date.issued2019-
dc.identifier.citationInternational Journal of Heat and Mass Transfer, 2019, v. 135, p. 323-330-
dc.identifier.issn0017-9310-
dc.identifier.urihttp://hdl.handle.net/10722/293383-
dc.description.abstractEmulsions have widely been used in various application, e.g. in energy system as a potential second refrigerant. However, there is a lack of comprehensive study on extraordinary effective thermal conductivity enhancement in the oil-in-water (O/W) emulsions, and effects of temperature and droplet size were not considered in the widely used models of effective thermal conductivity for the O/W emulsions. In this study, non-Fourier heat conduction characteristics in the O/W emulsions were investigated experimentally. The O/W emulsions were prepared with different droplet sizes by controlling the ultrasonic processing time. The O/W emulsions containing small droplets are stable. Effective thermal conductivity of O/W emulsions nonlinearly varies with droplet size, concentration, fluid properties and temperature. Small droplet size is beneficial for effective thermal conductivity enhancement of O/W emulsions. Thermal conductivity of fluids can be enhanced significantly especially at low concentration although thermal conductivity of oil is much lower than water conductivity, which could be due to non-Fourier heat conductions in O/W emulsions. Time lag ratio less than 1 indicates that no thermal waves exist in O/W emulsions, and diffusion-dominant non-Fourier heat conduction could exist in the O/W emulsions. A new model of effective thermal conductivity, which considers effects of fluid thermosphysical properties, oil concentration, droplet size and temperature, was developed for the O/W emulsions based on the measured data. This study could be helpful for exploring the mechanisms behind extraordinary heat conductivity enhancement phenomena of oil-in-water emulsions.-
dc.languageeng-
dc.publisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/ijhmt-
dc.relation.ispartofInternational Journal of Heat and Mass Transfer-
dc.subjectO/W emulsions-
dc.subjectNon-Fourier heat conduction-
dc.subjectExtraordinary effective thermal conductivity-
dc.subjectTime lag ratio-
dc.titleNon-Fourier heat conduction in oil-in-water emulsions-
dc.typeArticle-
dc.identifier.emailWang, L: lqwang@hku.hk-
dc.identifier.authorityWang, L=rp00184-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.ijheatmasstransfer.2019.01.105-
dc.identifier.scopuseid_2-s2.0-85061066192-
dc.identifier.hkuros319540-
dc.identifier.volume135-
dc.identifier.spage323-
dc.identifier.epage330-
dc.publisher.placeUnited Kingdom-

Export via OAI-PMH Interface in XML Formats


OR


Export to Other Non-XML Formats