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Effects of surface roughness and pressure applied on the thermal conductivity and interfacial thermal resistance measurement by the 3 omega method
Sumit Kumar Singh and Dong-Wook Oh
In this study, the measurement of thermal conductivity and interfacial thermal resistance between the microheater and polydimethylsiloxane (PDMS) with different surface roughness is measured by the bidirectional 3ω method. The PDMS samples with a different surface roughness of arithmetic average of roughness profile ranging from 0.29 to 2.58 m are considered. Maximum pressure of 250 kPa between PDMS and 3ω sensor is applied to manipulate the interfacial thermal resistance between the sample and the 3ω sensor. Comparison of measured and theoretically calculated temperature amplitudes are made to fit the thermal conductivity of PDMS and interfacial thermal resistance at the heater-sample interface. The thermal conductivity of PDMS is found to agree well with the literature value. The interfacial thermal resistance between the PDMS and microheater ranged from 8.5×10-7 to 4.5×10-7 m2K/W.
Keywords: 3ω method, thermal conductivity, interfacial thermal resistance, Roughness controlled PDMS
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DOI: 10.32908/hthp.v51.1299