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Experiments are conducted for the six samples listed in Table 4.5 for a range of ΔP from 5 kPa to 130 kPa, and the observed adsorption times and ΔTs for a total of 62 breakthrough experiments are reported in Figure 4.14. The trends showing a decrease in adsorption time with an increase in ΔP (Figure 4.14(a)) and marginal increase in ΔTs with an increase in ΔP (Figure 4.14(b)) are similar to the trends observed in case of PLOT columns. Additionally, for similar ΔPs, the highest ΔTs are observed for the highest adsorbent volume fraction, ω and lowest void fraction, ε as seen in Figure 4.14(b) and (c). With ε and MF known with higher certainty for the adsorbent-coated microchannels, the model results and observed data can be compared without the use of estimated packing fraction properties. The effect of adsorbent particle size (diameter), which was assumed constant at 2 μm for the model validation for PLOT columns, on heat and mass transfer results can also be analyzed. Figure 4.15 shows Scanning Electron Microscope (SEM) images of the adsorbent particles used for fabrication of the microchannels. It can be seen that the adsorbent particle size ranges from 2 μm to 7 μm in diameter. Variation of adsorbent particle size can affect heat and mass transfer results significantly. Comprehensive information on the adsorbent particle size distribution is unavailable; therefore, it is difficult to select the specific size of the adsorbent particles, based on the variation seen in the two SEM images in Figure 4.15. In the absence of more detailed information, a mean value of the adsorbent particle size was estimated from Figure 4.15, although a single value of the adsorbent particle size estimated based on insufficient data may not be a good representation for the entire test matrix. Therefore, simulations are conducted for a range of adsorbent particle sizes to assess the mass and heat transfer results and compare them with the observed experimental results. 140PDF Image | TEMPERATURE SWING ADSORPTION PROCESSES FOR GAS SEPARATION
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