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HEAT TRANSFER IN POROUS MEDIA: A REVIEW
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Set language NL EN. Contact Live chat offline E-mail: libservice ugent. The tortuosity of the solid skeleton was included by considering two outermost cases: inline and staggered configurations, as described in Figure 3. Figure 3. Experimental Methods Although several bench-scale tests were performed, this section introduces two independent experiments that are directly associated with the examination of heat transfer in porous media: 1.
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The exact quantity of irradiance on the exposed surfaces of a specimen placed in CC was thoroughly scrutinised in a previous study [ 38 ]. Unlike EF, CC simultaneously enables the real-time observation of both volume expansions and temperature increases. These favourable features contributed to the evaluation of the thermal insulation performance of the inorganic intumescent coating as well as to the verification of the numerical predictions. Electric Furnace Test 3. Figure 4. Figure 5. Table 1 Percentage probability distributions of cell volume. Figure 6. Table 2 Experimental data of fully expanded thickness units of mm [ 14 ].
Methodology 4. Figure 7.
Heat transfer mechanism through the porous specimen in cone calorimeter testing. Scheme of Determination of Effective Thermal Conductivity 4. Figure 8. Figure 9. Numerical Simulations and Results 5. Modelling Scheme The combined conduction-radiation through the porous medium, composed of the structured solid skeleton and clonal RECs, was numerically simulated. Two types of FEA models are proposed for different purposes: Figure 10 a,b demonstrate the geometry and thermal boundaries of the two types of models: 1.
This was developed to determine the size of the RECs associated with the findings of the topological analysis and to evaluate the thermal insulation performance of the inorganic intumescent system.
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We completed this assessment by defining a range of effective thermal conductivity k eff that was applicable to the porous coating-residue. Figure Table 4 Thermo-physical properties of the materials and convective coefficients in cone calorimeter testing. Prototype Model 5. Derivation of Void Radiation In order to simulate the radiation transfer through the voids of the inorganic intumescent coating, we formulated a radiation-exchange mechanism in a unit enclosure using the extended net-radiation method [ 41 ].
Multicellular-Type Model After the sub-study using the prototype model, we conducted a series of primary FEA simulations adopting the multicellular-type model. Table 5 Geometric variables used in the supplementary FEA simulations.
Heat and Mass Transfer with Condensation in Capillary Porous Bodies
Table 8 Geometric variables for multicellular modelling. Verification Figure 14 illustrates the concept of the model composed of thin layers i. Conclusions The main purpose of this work was to define the range of effective thermal conductivity k eff applicable to the particular form of porous medium inorganic intumescent coating to quantitatively assess its thermal insulation performance. Author Contributions Conceptualization, J. Conflicts of Interest The authors declare no conflict of interest. References 1. Dowling J. Bourbigot S. Fire Retardancy of Polymeric Materials.
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Steel Compos. Kang S. Coupled thermo-physical behaviour of an inorganic intumescent system in cone calorimeter testing. Fire Sci. Gibson L. Cellular Solids: Structure and Properties. Thermal, electrical and acoustic properties of foams; pp. Skochdopole R. The thermal conductivity of foamed plastics. Absorptivity and its dependence on heat source temperature degree of thermal breakdown. Kim D. Effect of wall conduction and radiation on natural convection in a rectangular cavity.
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Course - Heat and Mass Transfer in Porous Media - EP - NTNU
Placido E. Thermal properties predictive model for insulating foams. Intrared Phys. Zhao C. Analytical considerations of thermal radiation in cellular metal foams with open cells.
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