Research Article

Small-Scale Flat Plate Collectors for Solar Thermal Scavenging in Low Conductivity Environments

Table 1

Flow regimes versus Knudsen number.

Knudsen numberPressure (Torr)Flow regime

Kn < 0 . 001P > 9Continuum flow
0.001 < Kn < 0.10.09 < P < 9Slip flow
0.1 < Kn < 100.0009 < P < 0.09Transitional flow
10 < KnP < 0.0009Molecular flow