The length effect on packed bed effective heat transfer parameters

Heat transfer in packed-beds of agricultural waste with low rates of air flow applicable to solid-state fermentation

“…The calculated relation K r /k 0 is also presented, where k 0 is the stagnant effective thermal conductivity, whose values have been taken from Casciatori et al (2013), that presented stagnant effective thermal conductivities of beds packed with the same porous matrices used in the current work. As it may be seen on Tables 3 and 4, K r presented a trend of increasing with increasing air flow rates and of decreasing with the increase of bed height, as already reported in literature (De Wash and Froment, 1972;Dixon, 1985;Thoméo, 1995), although with inert porous matrices and not with such low air flow rates. At the lower air flow rates here employed, K r /k 0 ?…”

Heat transfer in packed-beds of agricultural waste with low rates of air flow applicable to solid-state fermentation

“…The calculated relation K r /k 0 is also presented, where k 0 is the stagnant effective thermal conductivity, whose values have been taken from Casciatori et al (2013), that presented stagnant effective thermal conductivities of beds packed with the same porous matrices used in the current work. As it may be seen on Tables 3 and 4, K r presented a trend of increasing with increasing air flow rates and of decreasing with the increase of bed height, as already reported in literature (De Wash and Froment, 1972;Dixon, 1985;Thoméo, 1995), although with inert porous matrices and not with such low air flow rates. At the lower air flow rates here employed, K r /k 0 ?…”

Wall and Particle-Shape Effects on Heat Transfer in Packed Beds

“……”

Analysis of a ring‐shaped sensor for use in packed‐bed heat transfer studies

“…The equipment used in this study, as shown in Figure 1, was similar to that of previous work in the literature (Gunn and Khalid, 1975;Dixon et al, 1978;Dixon, 1985a;Gunn et al, 1987), except for the temperature measurement.…”

“…It is possible, however, to see in Figure 7 that particle diameter strongly affects the wall heat transfer coefficient. Comparing Dixon (1978Dixon ( , 1985a (Dixon and Cresswell, 1979). packing materials with similar particle diameter, the effective radial conductivity is a little higher for metallic materials than for ceramic ones.…”

Heat transfer in packed-beds of agricultural waste with low rates of air flow applicable to solid-state fermentation

“…The calculated relation K r /k 0 is also presented, where k 0 is the stagnant effective thermal conductivity, whose values have been taken from Casciatori et al (2013), that presented stagnant effective thermal conductivities of beds packed with the same porous matrices used in the current work. As it may be seen on Tables 3 and 4, K r presented a trend of increasing with increasing air flow rates and of decreasing with the increase of bed height, as already reported in literature (De Wash and Froment, 1972;Dixon, 1985;Thoméo, 1995), although with inert porous matrices and not with such low air flow rates. At the lower air flow rates here employed, K r /k 0 ?…”

Wall and Particle-Shape Effects on Heat Transfer in Packed Beds

“……”

Analysis of a ring‐shaped sensor for use in packed‐bed heat transfer studies

“…The equipment used in this study, as shown in Figure 1, was similar to that of previous work in the literature (Gunn and Khalid, 1975;Dixon et al, 1978;Dixon, 1985a;Gunn et al, 1987), except for the temperature measurement.…”

“…It is possible, however, to see in Figure 7 that particle diameter strongly affects the wall heat transfer coefficient. Comparing Dixon (1978Dixon ( , 1985a (Dixon and Cresswell, 1979). packing materials with similar particle diameter, the effective radial conductivity is a little higher for metallic materials than for ceramic ones.…”

Heat transfer in packed-beds of agricultural waste with low rates of air flow applicable to solid-state fermentation

“…The calculated relation K r /k 0 is also presented, where k 0 is the stagnant effective thermal conductivity, whose values have been taken from Casciatori et al (2013), that presented stagnant effective thermal conductivities of beds packed with the same porous matrices used in the current work. As it may be seen on Tables 3 and 4, K r presented a trend of increasing with increasing air flow rates and of decreasing with the increase of bed height, as already reported in literature (De Wash and Froment, 1972;Dixon, 1985;Thoméo, 1995), although with inert porous matrices and not with such low air flow rates. At the lower air flow rates here employed, K r /k 0 ?…”

Wall and Particle-Shape Effects on Heat Transfer in Packed Beds

“……”

Analysis of a ring‐shaped sensor for use in packed‐bed heat transfer studies

“…The equipment used in this study, as shown in Figure 1, was similar to that of previous work in the literature (Gunn and Khalid, 1975;Dixon et al, 1978;Dixon, 1985a;Gunn et al, 1987), except for the temperature measurement.…”

“…It is possible, however, to see in Figure 7 that particle diameter strongly affects the wall heat transfer coefficient. Comparing Dixon (1978Dixon ( , 1985a (Dixon and Cresswell, 1979). packing materials with similar particle diameter, the effective radial conductivity is a little higher for metallic materials than for ceramic ones.…”