Energetic efficiency of mixing

By comparing it with the theoretical mixing time, the energetic efficiency of mixing >1 ) can be defined as the ratio between shear rate effectively used for mixing and total shear rate used for the flow ... 

It is impossible to determine theoretically the value of the energetic efficiency of mixing and, therefore, the comparison of the experimental correlation (Equation 4.27) with the theoretical relation (Equation 4.26) can be used for its evaluation ... 

The lower energetic efficiency of protein deposition is likely influenced by the mix of amino acids available and the energy cost associated with body protein turnover (Baldwin, 1995). 

The reason behind such a low energetic efficiency is the mismatch of flow fields and concentration fields. The mechanical energy provided to the mixer is used to achieve the flow in device, but in zones of pure component with no interface with another component, this energy does not contribute in mixing. In the case of micromixers, multilamination improves mixing by reducing the striation thickness, but it requires additional mechanical power to create fine multilamellae before contacting. 

In laminar liquid mixing applications, the range of variation of the Peclet number is between 10 and 10. Assuming an energetic efficiency q of several percent, Pe q 1 and the mixing time can be estimated by the following relation ... 

It has been shown in this chapter how to characterize mixing efficiency in micromixers and particularly how to relate mixing time to relevant operating parameters such as the Peclet number and the specific power dissipation. In spite of a low mixing energetic efficiency, micromixers can mix in a few milliseconds, much faster than conventional mixers. 

These nitro compounds act as good plasticizers for nitrocellulose (NC). In addition, these compounds when mixed with nitroglycerine (NC) reduce its sensitivity and thus act as efficient desensitizers for its safe handling and transportation. The enhancement in performance characteristics of PBXs or propellant formulations is mainly due to the fact that the conventional non-energetic plasticizers such as... 

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