Contact heat transfer - The last decade

Madhusudana, C. V.; Fletcher, L. S.

doi:10.2514/3.9298

Cited by 160 publications

(58 citation statements)

References 71 publications

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“…Les résistances thermiques de contact sont dues à un mauvais contact à l'échelle macrosco pique entre deux objets [Madhusudana et Fletcher, 1986] [Madhusudana, 1996] [Fletcher, 1988] [Bardon, 1972], À la séparation entre les deux objets, il va se former une couche de transition qui peut être faible si les milieux adhèrent parfaitement l'un à l'autre. Cette couche peut être plus importante s'il s'agit d'un contact entre deux milieux ayant des irré gularités de surface réunies par un liant (collage, soudure) ou simplement accolées avec un fluide interstitiel (air par exemple) comme le montre la figure 2.1.…”

Section: Contact Thermiqueunclassified

Prédiction par transfert inverse d’un champ de conductance thermique de contact dans un mur de réacteur métallurgique

Rousseau

Lacroix

Désilets

2014

Mechanics & Industry

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Section: Contact Thermiqueunclassified

Prédiction par transfert inverse d’un champ de conductance thermique de contact dans un mur de réacteur métallurgique

Rousseau

Lacroix

Désilets

2014

Mechanics & Industry

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“…A review of literature on the thermal conductance [8][9][10][11][12] has indicated a lack of experimental data of thermal contact resistance and total thermal conductance for honeycomb materials. Most of the previous studies on the thermal transport properties of honeycomb structures were analytically investigated.…”

Section: Introductionmentioning

confidence: 99%

Measurement of thermal contact resistance of aluminum honeycombs

Yeh

Chen

Wen

et al. 2003

Experimental Thermal and Fluid Science

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An experimental investigation of thermal contact resistance of the aluminum honeycomb (made of Al3104-H19 and Al3003-H16) sandwiched by two aluminum blocks was conducted with the honeycomb specimens aligned in either axial or lateral orientations. Honeycombs adopted in this study include two different cell diameters (d c ), 6.3 and 12.7 mm, as well as two different axial heights (H z ), 7.8 and 14.8 mm. For the axial tests, honeycomb sandwich specimens were jointed by four or eight pieces of bolts with an applied torque ranged from 1 to 6 N m. The interfacial contact pressures of axial honeycombs under different bolt-joined conditions were measured by the pressure-measuring films. For the lateral tests, the honeycomb was simply inserted between two aluminum blocks without using bolts to fasten. Results show that due to the anisotropic nature in heat conduction and the close contact provided by bolted joints, the total thermal conductance of axial honeycomb is greater than that of honeycomb in the lateral orientation under the condition with the same specimen height. An increase of either the cell diameter or specimen height of honeycombs leads to a decrease of the axial total conductance. Moreover, the axial total conductance was substantially enhanced by a double of the number of bolts used in the assembly of honeycomb specimens. However, the influence of bolt torque on the axial total conductance was observed only for the honeycomb with d c ¼ 6:3 mm and H z ¼ 7:8 mm. Due to the difference in specimen joint conditions, the thermal contact resistance between the solid aluminum surface and a lateral honeycomb is larger than that with an axial honeycomb. Under the conditions tested in this study, the thermal contact resistance of honeycombs in the axial direction appears to be one order of magnitude smaller than the total resistance. Nevertheless, the contribution of the lateral contact resistance of honeycombs to the total resistance was quite significant, especially for the specimen with a small height. It was found that the contact pressure of bolt-joined honeycombs in the interface increases evidently with an increase of either the bolt torque or the number of bolts. The empirical correlations between contact pressure and applied torque were also obtained for different joint conditions.

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“…2.3) has been of particular interest in several areas of application of heat transfer, e.g. nuclear reactor, cooking on a hot plate, aircraft structural joints (Madhusudana and Fletcher, 1986). Recause of the extensive volume of literature on the subject, the following review is limited to the thermal conductivity of granular materials.…”

Section: Conduction Heating and Dryingmentioning

confidence: 99%

“…Recause of the extensive volume of literature on the subject, the following review is limited to the thermal conductivity of granular materials. Madhusudana and Fletcher, 1986) It is generally accepted that the earliest scientific study of the thermal conductivity of granular materials was made by James Clerk Maxwell. Maxwell (1892) gave the following expression: It would be pertinent to mention that Russell (1935) used a different approach.…”

Section: Conduction Heating and Dryingmentioning

confidence: 99%

Zeolites as Particulate Medium for Contact Heating and Drying of Corn

Alikhani¹

1990

Drying Technology

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Zeolites as particulate medium for contact heating and drying of cornThe potential of granular zeolites as a heating medium for drying corn was evaluated in a batch type experimental dryer. At temperatures from 150 -250°Cand residence rimes of 3 -8 minutes. synthetic zeolites (4A and 13X) removed 9 -18 percentage points from the initial moisture of corn. These values were about double those of sand, the most commonly used particulate medium.Using an adiabatic dryer, the kinetics of moisture sorption in corn-zeolite mixtures was investigated. The heating medium in this part of the study was a naturaI zeolite (chabazite) and the corn was yellow dent type. Diffusivity values for corn were 1.012 x 10-5 -3.127 X 10-5 cm'ls with zeolite at temperatures of 140 -220°C. These values are much smaller than those for zeolite. Therefore, it is believed that the diffusion of moisture in corn itself is the main resistance to the transfer of moisture. The heat transfer coefficient between corn and zeolite was found to be in the range of 50 -312 W/ml.K. Luikov's model for simultaneous heat and mass transfer was applied to corn-zeolite mixtures and the equations were solved by the NumericaI Method of Lines (NMOL). These numerical solutions agreed closely with the experimental data.The processed corn was subjected to in vivo and chemical analyses. Results of feeding experiments using laboratory rats did not indicate that the nutritive quality of the processed corn was adversely affected. Similarly, the aeid detergent fibre analysis did not show a significant reduction in the availability of corn protein.

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Contact heat transfer - The last decade

Cited by 160 publications

References 71 publications

Prédiction par transfert inverse d’un champ de conductance thermique de contact dans un mur de réacteur métallurgique

Prédiction par transfert inverse d’un champ de conductance thermique de contact dans un mur de réacteur métallurgique

Measurement of thermal contact resistance of aluminum honeycombs

Zeolites as Particulate Medium for Contact Heating and Drying of Corn

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