Heat transfer in plug flow in cylindrical microcapillaries with constant surface heat flux

View/ Open
Author(s)
Che, Zhizhao
Wong, Teck Neng
Nam-Trung, Nguyen
Griffith University Author(s)
Year published
2013
Metadata
Show full item recordAbstract
Due to the presence of interfaces, heat transfer can be enhanced by the vortices in liquid plugs in microchannel heat exchangers. The heat transfer in liquid plugs moving in microcapillaries with constant-surface-heat flux boundary condition is investigated. The e ects of the Peclet number and the plug length are studied. Higher Peclet numbers and shorter plug length result in higher Nusselt numbers and lower maximum uid temperature. However, higher Peclet numbers require higher ow speed, while shorter plug lengths result in higher flow resistance coefficients. The pressure drop needs to be considered in the optimization ...
View more >Due to the presence of interfaces, heat transfer can be enhanced by the vortices in liquid plugs in microchannel heat exchangers. The heat transfer in liquid plugs moving in microcapillaries with constant-surface-heat flux boundary condition is investigated. The e ects of the Peclet number and the plug length are studied. Higher Peclet numbers and shorter plug length result in higher Nusselt numbers and lower maximum uid temperature. However, higher Peclet numbers require higher ow speed, while shorter plug lengths result in higher flow resistance coefficients. The pressure drop needs to be considered in the optimization of microchannel heat exchangers.
View less >
View more >Due to the presence of interfaces, heat transfer can be enhanced by the vortices in liquid plugs in microchannel heat exchangers. The heat transfer in liquid plugs moving in microcapillaries with constant-surface-heat flux boundary condition is investigated. The e ects of the Peclet number and the plug length are studied. Higher Peclet numbers and shorter plug length result in higher Nusselt numbers and lower maximum uid temperature. However, higher Peclet numbers require higher ow speed, while shorter plug lengths result in higher flow resistance coefficients. The pressure drop needs to be considered in the optimization of microchannel heat exchangers.
View less >
Journal Title
International Journal of Thermal Sciences
Volume
64
Copyright Statement
© 2013 Elsevier Inc. This is the author-manuscript version of this paper. Reproduced in accordance with the copyright policy of the publisher. Please refer to the journal's website for access to the definitive, published version.
Subject
Applied mathematics
Mechanical engineering
Microelectromechanical systems (MEMS)
Other engineering not elsewhere classified