Mixing mixture

Mengung,/. mixing, mixture blending, blend hybridization. 

Dry mixtures of barium phosphinate and potassium chlorate bum rapidly with a feeble report if unconfined, but even under the slight confinement of enclosing in paper, a sharp explosion occurs. The mixture is readily initiated by sparks, impact or friction. A mixture of calcium phosphinate, potassium chlorate and quartz exploded during mixing. Mixtures of various phosphinates and chlorates have been proposed as explosives, but they are very sensitive to initiation by sparks, friction or shock. Admixture of powdered magnesium causes a brilliant flash on initiating the mixture. 

Unevenly mixed mixtures may be obtained due to the significantly different powder densities between magnesium oxide and zirconia. 

Heating a well-mixed mixture of l-(2-hydroxyethyl)-2-ethoxycarbo-nyl-6,7-dimethoxy-l,2,3,4-tetrahydroisoquinoline and solid NaOMe at 130 °C for 45 min followed by extraction of the reaction mixture with EtOAc provided 9,10-dimethoxy-1,6,7,11 b-tetrahydro-2H,4H-[l, 3]oxa-zino[4,3- ]isoquinolin-4-one in 52% yield (09T8021). 1,3,4,6,7,11b-Hexahydro-2H-pyrimido[6,l-fl]isoquinolin-4-one 53 was obtained from pyrimidinone 91 by a Pictet-Spengler reaction in CH2C12 in the action of TFA at ambient temperature (09OL1559). 

LFL(niix), UFL(mix) = mixture lower and upper flammability limits... 

In order to obtain silica sol, nitric acid solution in water was added drop wise to the vigorously mixed mixture of TEOS in ethanol and after finishing of the dosing of hydrolyzing agent temperature of the obtained reaction mixture was increased to the boiling point and was hold for two hours. 

Despite the fact that the mixing entropy is small for polymer blends, it is always positive and hence promotes mixing. Mixtures with no difference in interaction energy between components are called ideal mixtures. Let us denote the volume fraction of component A by — and the corresponding volume fraction of component B becomes = 1 — The free energy of mixing per site for ideal mixtures is purely entropic ... 

Figure 2.11 (a) Concentrations present in the NaCl-KOH system plotted as concentration vectors from the origin, (b) The graphical meaning of mixing. Mixtures lie on a straight line joining the two concentrations. 

Fig. 5.24 Impact of PCC filler loading, as a function of PCC particle morphology, on the density and air permeability properties of paper. Abbreviations, c composite, reference, Co colloidal PCC, r rhombohedral PCC, Sea scalenohedral PCC, mix mixture...

Feeding Mixing mixture Mixing mixture Soaking Bio-Mos,... 

Lt liquid phase at terminal velocity condition mix mixture = gas + liquid + solid mf at minimum fluidization condition pmf particle at minimum fluidization condition... 

The first term represents the entropy of mixing, which coincides with that of the zero-order theory the second term relates to the enthalpy of mixing. Mixtures satisfying the above criteria are said to be strictly regular. We had encountered this relation before in a somewhat different disguise in Section 3.8. 

Noticeable difference in the HAM ignition delay time, when a pre-mixed mixture is injected into a pre-heated vessel, has been reported in experiments [51] investigating the Tq effect on self-ignition. Traditional calculations, using standard schemes, allow prediction of HAM safe storage time (see Table 6.1). 

Table 6.2 compares i, values obtained for pre-mixed mixtures with Xij for a H2 jet in air. It is easy to see that, for T,y > i there is a significant contribution of mixing to the total process of mixture preparation for ignition. 

Combustion and Explosion Characteristics of Non-premixed and Partially Pre-mixed Mixtures... 

Two significantly different fuel and oxidizer forms are considered while analyzing potentially combustible systems pre-mixed and non-premixed mixtures. The previous chapters are devoted to combustion modes in pre-mixed mixtures. 

Unlike the combustion modes of pre-mixed mixtures, in which dynamic loads are the most dangerous, the main threat of a diffusion flame is the long-term heat effect of high temperature combustion products. 

Diffusion flame can be characterized as a quasi-stationary, nearly isobaric flame initiated in a non-premixed mixture the chemical reaction (in the case of a laminar flame) occurs within a narrow zone. This zone can be assumed to be the flame surface. The key difference between the diffusion flame and the pre-mixed mixture flame is the chemical transition velocity that is limited by fuel/oxidizer mixing rate in the diffusion flame. Fuel/oxidizer flows have a stoichiometric ratio at the flame surface. However, when the fuel/oxidizer flow getting into the diffusion flame is large, there is no time to start the chemical reaction and the flame dies out. 

Triple and edge flames [12, 13] can be considered as a development of a partially pre-mixed mixture combustion occurring as the result of a non-mixed structure breakdown. They can be observed at the local extinction of a diffusion flame. The triple flame phenomenon was observed in experiments with diffusion combustion of a methane layer located under a horizontal ceiling simulating mine boring conditions [14]. The detailed investigation of such a phenomenon started after a triple flame configuration was discovered in a laminar flame stabilized in an elevated position over the nozzle section. 

The laminar flame jet flowing out of the nozzle has a configuration including a diffusion flame 1 (Fig. 11.7), a flame in a rich well-mixed mixture 2 and a flame in a lean well-mixed mixture 3. Those three different flame branches exist simultaneously. The flame base, called the triple point, is located along the stoichiometric contour and it can move when the flow parameters vary. Three spacially separated but related reaction zones coexist here the non-premixed mixture combustion occurs only in one of them. All three zones (branches) meet at the triple point. 

The first mechanism assumes that the blow-off occurs when the local flow velocity exceeds the maximum turbulent velocity of the flame in the pre-mixed mixture. This mechanism was proposed in [18], where the stream turbulence is considered statically using time averaging. The maximum value of the combustion turbulent velocity is the root-mean-square function of the time averaged axial component of the turbulent fluctuation velocity. 

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