title   
  

Heat transfer characteristics of plug flows with temperature-jump boundary conditions in parallel-plate channels and concentric annuli

Shojaeian, Mostafa and Yıldız, Mehmet and Koşar, Ali (2014) Heat transfer characteristics of plug flows with temperature-jump boundary conditions in parallel-plate channels and concentric annuli. International Journal of Thermal Sciences, 84 . pp. 252-259. ISSN 1290-0729 (Print) 1778-4166 (Online)

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Official URL: http://dx.doi.org/10.1016/j.ijthermalsci.2014.05.014

Abstract

In this study, heat transfer characteristics of plug flows in micro/nano scale were investigated by taking rarefaction effects into account. For this, thermal analysis of plug flows in parallel-plates and concentric annuli was performed for the constant heat flux condition at the walls, which were asymmetrically heated. First-order temperature-jump boundary condition was implemented at the wall assuming a gaseous plug flow, whereas its absence would correspond to either liquid plugs or plug flows at macro scale. Closed form expressions were analytically derived for obtaining temperature distributions and Nusselt numbers as a function of key parameters such as Knudsen number, Brandt number, wall heat flux ratio, and annulus aspect ratio. The results show that Nusselt number may increase or decrease depending on the major parameters such as rarefaction, wall heat flux ratio and annulus aspect ratio.

Item Type:Article
Uncontrolled Keywords:Microannulus; Parallel-plates microchannel; Slug flow; Plug flow; Nusselt number
Subjects:T Technology > T Technology (General)
T Technology > TJ Mechanical engineering and machinery
Q Science > QC Physics
ID Code:24354
Deposited By:Ali Koşar
Deposited On:01 Oct 2014 11:42
Last Modified:01 Oct 2014 11:42

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