Scale Effects on Thermal Conductivity

The above relation predicts that the thermal conductivity within 20% value of the mean free path and critical film thickness below which microscale effects must be considered is tabulated in Table 8.1. 

The above equations indicate that values of and Ky are within approximately 5% of the bulk thermal conductivity if T/A fp 7 (for Ky) and Lj 4.5 (for K. Therefore, the above relations can be used for determination of thermal conductivity when A fp L L. No general guidelines exist for thermal conductivity calculation when 1. 

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