The result showed that: at the optional condi tions or:pH=8.5,aeration intensity is 180 m3/(m2·h), the removal rate of NH3- N was 55.6%after 24 h blowing, and the effluent NH3-N concentration could not limit biological treatment.
The improved refining process parameters were oxygen∶nitrogen = (4～5)∶1 in blowing gas in first oxidation period, oxygen∶argon = 1∶(1～2) in second oxidation period, refining temperature ≤ 1 710 ℃, CaO/SiO 2≥1.4 and MgO content ≥8% in slag.
By injecting and blowing the lime-based powder flux (85%lime(CaO)+15% fluorite(CaF2)) of 3~5kg/t-steel with the totaltreatment time of 12~20min, it is possible to decrease the sulphur content in molten steel to an ultra-low level below (5~10)x10-4mass% from (60~80)xl0 -4mass%.
The spinning process prarameters should be on the following condition:spinningtemperature 294～297℃,lateral blowing speed 0.28～0.30m/s and its temperature 26～28℃,windup filament yarn draw ratio 3.30～3.80.roll temperature 80～85℃ and plate temperature 180～180℃.
The dyeing evenness of the 233dtex/72f nylon 66 fine denier filament yarn produced through one-step method of FDY can be improved by optimizing its process parameters such as polymer quality,spinning temperature,side blowing speed,oiling rate of spinning components,heating temperature of rollers and tension,etc.
Experimental study of boundary-layer control by blowing on a flat plate at M=2.5
Effect of blowing various gases into the boundary layer on the friction, heat, and mass transfer for a power-law variation of th
Formulas are derived which make it possible to determine the effect of various physical characteristics of the injected and external gases on the blowing coefficient for zero Mach number and a temperature factor of unity.
Considering that the blowing coefficients for heat transfer depend very weakly on the Mach number and the temperature ratio , it may be recommended that the formulas obtained for these values be used for other values of these parameters as well.
Blowing coefficient with arbitrary variation of the mass flow rate of the blown gas past a body around which flows a stream with