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3.4 Matrix heat exchangers 31 Coppage and London[88] and Tong and London[89] collated by Kays and London[71] for heat transfer with wire mesh and crossed rod matrices have been correlated with porosity by Qvale and Smith[93]. They were able to find some degree of correlation for the random stacking case but not the aligned case. Figure 3.4 Graph of drag coefficient vs. plate porosity at Re=160. 1:1 II) '0 1.6- - 104- Re=160, o/d=1 - 0 1.2- 0 bI) (\j lE II) Q - +D + <> 2.2- - 2- - <> 1.8- <> - D + <> Shevyakova & Orlov Kays & London Mikulin et al. - D 1-D 0.8- - 0.6- - 004- - 0.2 0.1 0.3 + D + 0.5 Plate porosity <> The effects of spacer thickness on the heat transfer coefficient and flow friction depend on the manner of stacking. For the staggered case increasing the spacer thickness to pore diameter ratio can be expected to reduce the drag coefficient while not substantially effecting the convection heat transfer coefficient. This is backed up by the results of Mikulin et al.[83], Orlov et al.[85] and Shevyakova and Orlov[86]. For aligned holes increasing the spacer thickness to pore diameter ratio may be expected to increase both the heat transfer and drag coefficient, and this is confirmed by the results of McMahon et al.[70] and Mikulin et al.[83]. 3.5 Sizing procedure development 3.5.1 Heat transfer Venkatarathnam's approximate analytical solution for the equations for energy balance and heat transfer, accounting for the heat transfer coefficient, axial conduction, number of plates, and fin effectiveness in MHE's, for balanced flow is shown in <> D + 0.7 0.9 D <>PDF Image | CO2 removal from air for alkaline fuel cells operating with liquid H2
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