Thermal contact conductance for aluminum and stainless steel contacts

1998 ◽  
Author(s):  
E. Marotta ◽  
L. Fletcher
Keyword(s):  
Stainless Steel ◽  
Thermal Contact ◽  
Thermal Contact Conductance ◽  
Contact Conductance

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.

Correlations for Thermal Contact Conductance In Vacuo

1972 ◽  
Vol 94 (3) ◽  
pp. 276-280 ◽  
Author(s):  
T. R. Thomas ◽  
S. D. Probert
Keyword(s):  
Surface Roughness ◽  
Stainless Steel ◽  
Thermal Contact ◽  
Correlation Coefficients ◽  
Thermal Contact Conductance ◽  
Contact Conductance ◽  
Data Points ◽  
Nominal Contact Area ◽  
Better Than ◽  
Made In

A correlation developed by Holm for thermal contact conductance measurements made in vacuo is discussed and its physical basis is deduced with the help of dimensional analysis. On modifying Holm’s treatment by including surface roughness and neglecting nominal contact area, the analysis yields a dimensionless conductance C* = C/σk and a dimensionless load W* = W/σ2M. When 350 data points from the literature for aluminum and stainless steel contacts in vacuo are plotted in this form C* is found to be proportional to about W*0.73 with correlation coefficients of better than 0.9. The correlations for the two materials do not coincide, however, and this and other discrepancies are discussed.

Sign in / Sign up

Export Citation Format

Share Document