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k h air 0.387Ra 0.60 D ln RFS,mid R R Heat ,ins Ins ,inner (4.25) 2kFS Equations (4.26) and (4.27) show the calculation of convection (Churchill and Chu, 1975) and radiation heat transfer coefficients (Incropera et al., 2011) for the experimental environment. For the convection heat transfer coefficient, the empirical correlation for a horizontal cylinder is used. Additional details about the calculation of natural convection and radiative heat transfer coefficients, insulation surface temperature, and rate of heat loss for a range of temperature differences between the fused silica cover and the ambient are provided in Appendix E. Although the test section is laid between two large flat surfaces, use of the Nusselt number correlation for flat plate over-predicts the heat transfer coefficient by 20% because the adsorbent-coated microchannels do not make contact with the fiber glass plates at all locations, as shown in Figure 4.1(a). Regardless, the convective and radiative heat transfer coefficients remain very small in the test environment (2.8 and 0.6 W m-2 K-1, respectively). (4.26) (4.27) 2 1 6 Dins 9 free 8 16 27 1 0.559 Pr h 4T3 rad r 0 124PDF Image | TEMPERATURE SWING ADSORPTION PROCESSES FOR GAS SEPARATION
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