10.18 A large furnace has within it a large number of parallel tubes arranged in an equilateral triangular array. The tubes are of 2.5 cm outside diameter, and the tube centers are spaced 7.5 cm apart. The furnace gas is composed of 75% CO and 25% HO by volume, and the combustion process in the gas maintains the gas temperature at 1300 K and a total pres- sure of 0.9 atm. What is the radiative flux incident on a tube in the interior of the bundle (i.e., completely surrounded by other tubes) per meter of tube length? In Leckner's correlations and equations, p is in bar, and L. is in cm. The correlation equation is M E(T, PL.) = exp ao + a; [log(pl.)] j=1 (9.64) where a; = Coj + Cij . (7/1000) The pressure correction for CO2 from Leckner is given by Cco =1+(Aco 1)=co where [1.00 +0.10(7/1000) -1.45 PE.CO2 +0.23 ACO = -1.45 -0.77 PE,CO2 +1.00 +0.10(7/1000) Eco = exp{-1.47[- log10(PcoLe)]} (9.66)