In situ visualization study of CO2 gas bubble behavior in DMFC anode flow fields

Review on heat conduction, heat convection, thermal radiation and phase change heat transfer of nanofluids in porous media: Fundamentals and applications

Heat as a tracer to quantify water flow in near-surface sediments

Kinetics study and modelling of steam methane reforming process over a NiO/Al2O3 catalyst in an adiabatic packed bed reactor

http://staff.bath.ac.uk/ensdasr/PAPERS/A%20synthesis%20of%20tortuosity%20and%20dispersion%20in%20effective%20thermal%20conductivity%20of%20porous%20media.pdf

A synthesis of tortuosity and dispersion in effective thermal conductivity of porous media

Electric analogue circuits are used for evaluating the effective thermal conductivities in packed beds without fluid flow, taking into consideration the numbers of packings placed in the direction of heat flow.In the analysis, it is assumed that the thermal resistance within packed beds may occur in the following forms:(1) Thermal resistance of packing itself.(2) Thermal resistance of contact area.(3) Thermal resistance of fluid between packings.(4) Thermal resistance to heat radiation from packing to packing.(5) Thermal resistance to heat radiation from packing to adjoining packing beyond one.The equations obtained are given in the form of Eqs. 1, 3, 6 and 7. Introducing the values of thermal resistance into Eq. 7, we have obtained Eq, 8 which expresses the relation of ks/kg.Experiments have been carried out with various packings: iron, porcelain, glass balls and insulating fire bricks at the temperature between 100 and 1000°C.Comparisons between the experimental results and the values obtained from Eq. 8 are shown in Figs. 11, 12, 13, 14 and 15. The calculation can be readily handled by employing the chart of Fig. 8, without using the complicated formula, Eq. 8. The difference between the value obtained from the chart (Fig. 8) and that obtained from Eq. 8 is small and negligible.

S Sugiyama

Papers

Effective Thermal Conductivities in Packed Beds