OP-II-3

PP-I-43The field of a current of a current is conditionally broken down on n elementaryconcentric strata. Thickness maiden (near a wall) a stratum y 1 = 0,5 (Δy + d т ), and thesubsequent strata – Δy = (R–0,5 d т ) / (n – 0,5).In a current direction the calculated schema envisions current breakdown bydiametrical sections, on spacing interval Δx from each other.The algorithm of calculation of heat change and indispensable length of a tube forheating of a current to the set temperature t п at the set allocation of temperature of awall t ст = t ст (x) includes calculus of domestic gravity of a heat flow q"п,ст, temperatureallocations t г, i in a radial direction and mean values of temperatures of phases t "г,срandt " т in diametrical section of an exit of each of succession of leases Δx j .,срOn fig. 1 calculation on the designed algorithm is compared to data of differentFig. 1. Dependence Q n /Q from х/D:lines – our calculation on tendered algorithm(Re=10 4 ; t СТ =100 °С; current temperature onan input t о =0 °С); 1÷11 – calculation with useof skilled formulas of different authors(diameter of tubes D = 8 ÷ 50 mm, the sizesof fragments d Т = 3 ÷ 865 microns)authors for chemically inert aerosolsin co-ordinates Q n /Q = f (x/D).Magnitudes transmitted from a pipewall to a current aerosols (or on thecontrary) calorific powers Q n aredetermined by calculation on theprivate skilled equations received byexplorers. Calorific power Qcorresponds to a current of gaswithout fragments. From fig. 1 it isvisible, that results of calculation willwell be matched test data available inthe literature.Comparison of results of calculationwith our experimental data on heatchange of a current of air withdecaying fragments of bicarbonate ofsodium (Furnacing reaction) also hasdemonstrated on quite satisfactoryconvergence calculated and testdata.298