Mixing process efficiency

Two types of competitive reactions, consecutive and parallel, have been proposed to investigate the mixing process efficiency ... 

There is an apparent paradox here that as the cooled cycle contains an irreversible process (constant pressure mixing), its efficiency might be expected to be lower than the original uncooled cycle. The answer to this paradox follows from consideration of all the irreversibilities in the cycle and we refer back to the analysis of Section 3.2.1.1, for the rational efficiency of the [CHT]ru cycle. The irreversibility associated with the heat supply is unchanged, as given in Eq. (3.3), but the irreversibility associated with the heat rejection between temperatures T(, and T) = Ta becomes... 

The conversion reaches a maximum at 30 Hz. At a higher rate of rotation the increased separatory power of the centrifuge leads to a reduction of the volume of the mixed phase in which the reaction takes place. At reduced rotational speeds of the centrifuge the mixing process becomes less efficient, resulting in larger average drop sizes in the dispersed phase and thus to reduced mass transfer rates and conversion levels. 

Some studies have demonstrated the ability of mixed bacterial cultures to promote azo-dye conversion. The main advantage of mixed cultures is the ability to cope with conversion of both the dye and the main products of dye degradation. Characterization of individual strains in consortia has seldom been accomplished during continuous tests. Only a few attempts have been made to characterize the morphology of bacteria during continuous operation of bioreactors and to relate process efficiency to the bacterial population [32, 33]. 

Fig. 15.23 Effect of air mixing process in the ramburner on combustion efficiency for two single-port intakes or two multi-port intakes as a function of boron particle size.

The nonresonant background in CARS spectroscopy originates from instantaneous four-mixing processes, while the resonant contribution involves real vibrational states. This provides a basis for possible discrimination against the nonresonant background. To do so, one has to come up with a pair of pulses that excite the vibrational state, and the third, time-delayed pulse will only contribute to the resonant part of the CARS signal. However, to make this scheme work efficiently, one has to overcome certain obstacles. To achieve high spectral resolution, the bandwidth of the third pulse should... 

Comparison of these two polarizations shows that P2 Pi- Hence, in an isotropic medium such as a gas or a liquid x " = 0 and second order phenomena are not observable. Thus, only anisotropic media such as certain crystals are suitable for three-wave mixing processes. A consequence of a crystal being anisotropic is that it exhibits birefringence. However, the crystal birefringence enables phase matching to be achieved resulting in efficient generation of the new wave. 

This technology is ineffective in the treatment of inorganic contaminants. High-density wastes do not mix well with the forced air and reduce process efficiency. 

Two-roll mills have been analyzed in terms of the pressure distribution and velocity profiles created between the rolls [95], the shear imposed on fluid elements exposed to these conditions in the nip region [129] and their resulting efficiency as dispersive mixing devices [130,131]. An earlier mathematical model was proposed to describe the dispersive mixing process of carbon black in rubber on roll mills, through consideration of agglomerate size distribution and... 

Process ability Surface area, surface free energy, crystal defects, and deformation potential affect compressibility and machineability on high-speed tableting machines with reduced compression dwell times Particle size distribution and shape affect flow properties, efficiency of dry mixing process, and segregation potential Compressibility, flow ability, and dilution potential affect the choice of direct compression as a manufacturing process... 

Assess whether finite rate mixing affects the choice of NH3 injection location or the estimated process efficiency for the MSW incinerator application of the previous problem. Use an estimated mixing time (90%) of 300 ms. 

---