Thermal Contact Conductance Metal Surfaces Air

Heat Transfer Engineering
Thermodynamics
Engineering Physics

Thermal contact conductance of some metal surfaces in air (from various sources)

Material
Surface Condition
Roughness
µm
Temperature
°C
Pressure
MPa
hc*
W/m2· °C
Identical Metal Pairs
416 Stainless steel
Ground
2.54
90–200
0.3–2.5
3800
304 Stainless steel
Ground
1.14
20
4–7
1900
Aluminum
Ground
2.54
150
1.2–2.5
11,400
Copper
Ground
1.27
20
1.2–20
143,000
Copper
Milled
3.81
20
1–5
55,500
Copper (vacuum)
Milled
0.25
30
0.7–7
11,400
Dissimilar Metal Pairs
Stainless steel-
Aluminum
-

20–30

20
10
20
2900
3600
Stainless steel-
Aluminum
-

1.0–2.0

20
10
20
16,400
20,800
Steel Ct-30-
Aluminum

Ground

1.4–2.0

20
10
15–35
50,000
59,000
Steel Ct-30-
Aluminum

Milled

4.5–7.2

20
10
30
4800
8300
Aluminum-
Copper

Ground

1.3–1.4

20
5
15
42,000
56,000
Aluminum-
Copper

Milled

4.4–4.5

20
10
20–35
12,000
22,000

*Divide the given values by 5.678 to convert to Btu/h · ft2 · °F.

Thermal Contact Resistance

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