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Bare-wire thermocouples (Omega, TT-T-40, and Type T) are used for temperature measurement over the fused silica coating of the microchannel to track the adsorption thermal wave and heights of the temperature peaks during adsorption. Thermocouples are calibrated using a temperature bath at 5°C, 15°C, 35°C and 50°C. Although the overall size of the thermocouple does not exceed 400 μm, it is impractical to pierce the PLOT column and insert thermocouples in the adsorbent layer, as it would disrupt the adsorption thermal wave and potentially dislodge parts of the adsorbent layer. Hence, these thermocouple wires are attached to the fused silica coating at ten equally spaced axial locations, which also enables easy setup and disassembly to facilitate a variety of channels. These bare-wire thermocouples are coiled and tied onto the outer surface of the microchannel to maximize the contact area and enhance the contact pressure. Application of a thermal sealing agent for this purpose is not found to yield good results, because the thermal mass of the sealant itself is found to absorb a significant amount of energy in the adsorption thermal wave, yielding an incorrect pattern for the fused silica wall temperature. For a copper- copper constantan thermocouple making contact with the wall without any thermal seal, the contact thermal resistance without any application of contact pressure is 0.04 K-m W-1 (Dassault Systems, 2011). This value is 3% of the heat transfer resistance from the adsorbent layer to the microchannel and is expected to decrease further as the thermocouple wire is coiled around the wall and its end is forced to make contact with the wall. Therefore, the contact resistance is neglected. The thermocouple hot end is manually fabricated to be as small as possible, to reduce the thermal resistance of the thermocouple itself. For measurement of the absolute pressure at the microchannel inlet, a Rosemount 2088A pressure transducer (Range: 0 to 5500 kPa, 103PDF Image | TEMPERATURE SWING ADSORPTION PROCESSES FOR GAS SEPARATION
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