Thermal Conductivity Measurements of Carbon Fiber Composites and Thermal Interface Materials
Experiments conducted at Purdue University for the CMS Phase II Inner Tracker
Ryan Story, Jack Wheeler, Abraham Matthew Koshy, Sushrut Karmarkar, Andreas Jung, Souvik Das
Purdue University, West Lafayette, IN
Purdue University hosts two home-made instruments for thermal conductivity measurements in steady-state conditions. One measures thermal conductivity through the plane of the material and the other measures conductivity in the plane of the material. This was done to disentangle k xx, k yy and k zz for anisotropic materials like carbon fiber. We do not have a way to measure off-diagonal terms in the thermal conductivity tensor, like k xy, and for isotropic materials and orthogonal layups of unidirectional carbon fiber, we assume them to be zero.
Example Table
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| Layup and Curing | Direction | Theoretical Expectation | Measurement at 0 rad | Measurement at 1.5 Grad |
|---|---|---|---|---|
| [0/0/0... ], 4 bar | kxx | 318 W/mK | 335 ± 28 W/mK (INPL11) | N/A |
| kyy | 0.53 W/mK | 6.6 ± 1.1 W/mK (INPL12) | N/A | |
| kzz | 0.53 W/mK | 1.18 ± 0.15 W/mK (TC5) | N/A | |
| [0/0/0... ], 10 bar | kzz | N/A | 1.36 ± 0.08 W/mK (TC20) | N/A |
| [0/0/0... ], 20 bar | kzz | N/A | 2.21 ± 0.31 W/mK (TC16) | N/A |
Example Figure
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Example Code/Data Block
Example Code/Data Block
In-plane thermal conductivity measurement
Experimentalist, Ryan Story
Date of measurement, 11/11/2021
Apparatus, InPlane
Material, INPL17
Sample, 4
Length (mm), 35.15, 0.05
Width (mm), 50.0, 0.05
Thickness (mm), 3.08, 0.05
Heater Voltage, 6.00
Cooler Voltage, 0.0
Hot Fluxmeter Channels, 105, 106, 107, 108, 109, 110
Cold Fluxmeter Channels, 125, 126, 127, 128, 129, 130
Hot Fluxmeter Temperatures (C), 21.9944, 21.8328, 21.7156, 21.5484, 21.4111, 21.2781
Cold Fluxmeter Temperatures (C), 18.2183, 18.0388, 17.896, 17.7796, 17.6289, 17.4901
Hot Fluxmeter Temperature Uncertainties (C), 0.00286277, 0.00287845, 0.00262381, 0.00257303, 0.00200187, 0.00248906
Cold Fluxmeter Temperature Uncertainties (C), 0.00260369, 0.00284263, 0.00235371, 0.00246276, 0.00238644, 0.00248177
Hot Fluxmeter Temperatures Relative to Hottest Thermistor (C), 0, -0.161281, -0.277715, -0.446358, -0.585961, -0.715255
Cold Fluxmeter Temperatures Relative to Hottest Thermistor (C), 0, -0.18023, -0.323839, -0.43878, -0.590937, -0.730519
Hot Fluxmeter Temperature Relative to Hottest Thermistor Uncertainties (C), 0, 0.0050968, 0.0035719, 0.00380324, 0.00403422, 0.00291153
Cold Fluxmeter Temperature Relative to Hottest Thermistor Uncertainties (C), 0, 0.00535943, 0.00215255, 0.00403764, 0.00381002, 0.00240092