NDLI: XMT-based direct simulation of flow and heat transfer through open-cell aluminum foams

Content Provider	IEEE Xplore Digital Library
Author	Bodla, K.K. Murthy, J.Y. Garimella, S.V.
Copyright Year	2010
Description	Author affiliation: School of Mechanical Engineering and Birck Nanotechnology Center, Purdue University, 585 Purdue Mall, West Lafayette, IN 47907-2088 USA (Bodla, K.K.; Murthy, J.Y.; Garimella, S.V.)
Abstract	Three aluminum foam samples of varying pore sizes - 10 ppi, 20 ppi and 40 ppi - are CT-scanned using a commercial X-ray scanner at 20 micron resolution for measuring and comparing important heat transfer parameters such as effective thermal conductivity and Nusselt number. Small sub-samples from the resulting stack of images are processed to generate featurepreserving high-quality finite-volume meshes. It is observed that all three foam samples exhibit similar volumetric porosity (in the range ∼ 91–93%), and thereby a similar thermal conductivity. For the domain sizes considered, the samples exhibit anisotropic conduction along the three coordinate directions of the mesh, which is attributed to the randomness of the structure and the small domain sizes considered. The values of average effective thermal conductivity are compared with a number of previous experimental and simulation results. Effective tortuosity for conduction along the coordinate directions is also calculated. Permeability simulations in the Darcy flow regime with air and water show that foam permeability is isotropic and is of the order of $10^{−7}$ $m^{2}.$ The resulting friction factor variation with Reynolds number is validated against published results. Nusselt numbers are also computed for this range of Reynolds numbers. The heat transfer results exhibit a dependence on the linear porosity, even though the corresponding volumetric porosity is the same for all the samples considered.
Starting Page	1
Ending Page	9
File Size	1125118
Page Count	9
File Format	PDF
ISBN	9781424453429
ISSN	10879870
e-ISBN	9781424453436
DOI	10.1109/ITHERM.2010.5501338
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2010-06-02
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Heat transfer Aluminum Thermal conductivity X-ray imaging Permeability Image reconstruction Geometry Friction Water heating Computed tomography Darcy flow microtomography CT-scan aluminum foam porosity effective thermal conductivity tortuosity permeability friction factor Nusselt number
Content Type	Text
Resource Type	Article

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