Thermal Contact Conductance of Packed Beds in Contact With a Flat Surface

1988 ◽  
Vol 110 (1) ◽  
pp. 38-41 ◽  
Author(s):  
G. P. Peterson ◽  
L. S. Fletcher
Keyword(s):  
Experimental Investigation ◽  
Stainless Steel ◽  
Thermal Contact ◽  
Spherical Particles ◽  
Thermal Contact Conductance ◽  
Packed Beds ◽  
Contact Conductance ◽  
Analytical Expression ◽  
Flat Surfaces ◽  
Stainless Steel 304

An experimental investigation was conducted to determine the thermal contact conductance of packed beds of spherical particles in contact with flat surfaces. Beds comprised of four materials, Aluminum 2017-T4, Yellow Brass, Stainless Steel 304, and Chromium Alloy AISI 52100, all in contact with flat Stainless Steel 304, surfaces were evaluated in a vacuum environment, at a mean interface temperature of 66°C. In addition to the experimental program, an analytical expression was developed by combining previous work performed by other investigators. The results of the experimental investigation are compared with the analytical expression and indicate that an accurate method of predicting the thermal contact conductance at the interface between beds of spherical particles and nominally flat surfaces has been identified.

Thermal Rectification in Similar and Dissimilar Metal Contacts

1991 ◽  
Vol 113 (1) ◽  
pp. 30-36 ◽  
Author(s):  
P. F. Stevenson ◽  
G. P. Peterson ◽  
L. S. Fletcher
Keyword(s):  
Surface Roughness ◽  
Stainless Steel ◽  
Heat Flow ◽  
Thermal Contact ◽  
Thermal Contact Conductance ◽  
Contact Conductance ◽  
Thermal Rectification ◽  
Material Type ◽  
Stainless Steel 304 ◽  
Nickel 200

An investigation was conducted to verify experimentally the existence of thermal rectification and to determine the effect of surface roughness and material type. Four pairs of test specimens were evaluated: one with a smooth Nickel 200 surface in contact with a rough Nickel 200 surface, one with a smooth Stainless Steel 304 surface in contact with a rough Stainless Steel 304 surface, one with a smooth Nickel 200 surface in contact with a rough Stainless Steel 304 surface, and finally, one with a smooth Stainless Steel 304 surface in contact with a rough Nickel 200 surface. The thermal contact conductance was measured for heat flow from both the smooth to rough and rough to smooth configurations for all four pairs. The results indicate that thermal rectification is a function of surface characteristics, material type, and heat flow direction. For similar materials in contact, some thermal rectification was observed with heat flow from the rough surface to the smooth surface resulting in a higher value of contact conductance. For dissimilar materials, the thermal contact conductance was highest when the heat flow was from the Stainless Steel 304 to Nickel 200. In these cases, the surface roughness was shown to be of secondary importance.

Analytical Studies of Contact of Nominally Flat Surfaces; Effect of Previous Loading

1971 ◽  
Vol 93 (4) ◽  
pp. 451-456 ◽  
Author(s):  
B. Mikic
Keyword(s):  
Size Distribution ◽  
Contact Area ◽  
Thermal Contact ◽  
Thermal Contact Conductance ◽  
Contact Conductance ◽  
Flat Surfaces ◽  
Analytical Studies ◽  
Previous Loading

This work analytically investigates effect of previous loading on contact area, number of contact prints, their size distribution, and the value of thermal contact conductance for two nominally flat surfaces in contact. The model used in the analysis assumes that the surfaces are Gaussian and that in the first loading deformation of the surface asperities is plastic.

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