NDLI: The effect of internal particle heat conduction on heat transfer analysis of turbulent gas

Content Provider	Springer Nature Link
Author	Haim, Mordechai Kalman, Haim
Copyright Year	2008
Abstract	In many cases the conduction mechanism inside a particle can not be ignored (large particles, low thermal conductivity and high porosity) during turbulent gas–particle flows. However, the accurate solution might be difficult to apply. Therefore, we first develop here the ability to conduct accurate solution and then we define the criterion for which the internal conductivity might be ignored. A combination between commercial C.F.D. code and user defined programs was developed to predict numerically the gas–particle velocity and temperature profiles. The selected criterion (defined at the outlet of the pipe’s cross-section), referred to the relation between the computational desirable average temperature difference $$(T_{{\rm p}_{_{\rm wall}}} - {{T_{\rm p}}_{_{\rm center}}})_{_{_{\rm AVERAGE}}}$$ without ignoring internal heat conductivity and the average particles temperature $${T_{\rm p}}_{_{\rm AVERAGE}}$$ by ignoring internal heat conductivity, determines whether to consider the heat conduction mechanism in numerical simulations or to ignore it. It was found that the average particles temperature for T p = f(r) is lower than the case when T p = constant. Also, it was found that the non-dimensional temperature difference criterion is a continuous function of [Bi × (d p/D)] for a specific geometry, various pipe and particle diameters, various particles’ thermal conductivities, constant heat flux and Re number. The numerical code enables to extend the classical criterion for Bi number of solids to various gas–particle systems and different operational conditions.
Starting Page	341
Ending Page	349
Page Count	9
File Format	PDF
ISSN	14345021
Journal	Granular Matter
Volume Number	10
Issue Number	4
e-ISSN	14347636
Language	English
Publisher	Springer-Verlag
Publisher Date	2008-03-04
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Gas–particle flow Turbulence Heat transfer Thermal conductivity Lagrangian approach CFD simulation Engineering Thermodynamics, Transport Phenomena Industrial Chemistry/Chemical Engineering Structural Foundations, Hydraulic Engineering Engineering Fluid Dynamics Granular Media
Content Type	Text
Resource Type	Article
Subject	Physics and Astronomy Mechanics of Materials Materials Science

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