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microchannel inlet. This variation clearly indicates the variation in adsorbent particle size. The average of maximum slopes for all nine experimental readings is 8.38°C s-1. Simulation of the models with different adsorbent particle sizes provides insight into relative time scales for the adsorption in the adsorbent layer and convection in the microchannel. For an adsorbent particle size of 7 μm, the adsorbent particles at all locations are still undergoing adsorption and the corresponding temperature rise, while CO2 starts appearing in the outlet stream. However, this observation is not in agreement with the experimental findings, which can be confirmed by comparing the time instances when CO2 appears in the outlet stream (Figure 4.16(d)) and the starting instant of CO2 saturating the last adsorbent layer location, which is seen as the last temperature peak (solid brown line in Figure 4.16(c)). The last adsorbent layer location at 0.9 m may be loaded with a set of larger adsorbent particles because of a smaller local temperature slope compared to the sharp temperature curves for the upstream locations. End effects such as acceleration of the flow and mixing in the headers may not be the cause for this phenomenon, because not all the local readings exhibit a temperature peak with reduced slope (Figure 4.2 for example). Additionally, the laboratory scale model is simulated for predetermined patterns of adsorbent particle size variation. The SEM image in Figure 4.15 shows that the nominal maximum and minimum sizes (approximated as diameters) of the adsorbent particles are 7 μm and 2 μm, respectively. A thorough mean value analysis cannot be performed, because of lack of extensive data on the variation of size of adsorbent particles used in the present study. With the availability of nominal maximum and nominal minimum sizes, three axial profiles of particle size distribution, from channel inlet to outlet: linearly varying diameter from 2 μm to 7 μm, linearly varying 145PDF Image | TEMPERATURE SWING ADSORPTION PROCESSES FOR GAS SEPARATION
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