Natural convection in water saturated metal foams is explored though experiments and numerical simulations. From these data a new generalized heat transfer correlation is developed for saturated metal foam with superposed water layers heated from below with arbitrary placement of the foam with respect to the bounding heated and cooled surfaces. The macroscopic correlation allows prediction of heat transfer with known or easily measurable properties of the foam. For Rayleigh numbers from 106 to 108, water saturated copper foam enhances heat transfer compared to pure water when the foam is adjacent to the heated or cooled boundary, but immersion of the foam without contact with the boundary provides no benefit. The enhancement of heat transfer is attributed primarily to conduction.
|Original language||English (US)|
|Number of pages||7|
|Journal||International Journal of Heat and Mass Transfer|
|State||Published - Jun 2015|
Bibliographical noteFunding Information:
Yan Su’s study was supported by the Solar Energy Laboratory of University of Macau under projects FDCT/060/2014/A2, FDCT/115/2012/A, and MYRG2014-00014-FST. The experimental work at the University if Minnesota was partially supported by a grant from the National Renewable Energy Laboratory. Computing support was provided by the University of Minnesota Supercomputing Institute and ICTO of University of Macau High Performance Computing Center. The authors thank Professor Francis Kulacki for many valuable discussions on the interpretation of the experimental data.
© 2015 Elsevier Ltd. All rights reserved.
- Macroscopic correlation
- Metal foam
- Natural convection
- Porous medium