Entrainment ratio

Few experimental data exist on laminar jets (see Gutfinger and Shinnar, AJChE J., 10, 631-639 [1964]). Theoretical analysis for velocity distributions and entrainment ratios are available in Schhcht-ing and in Morton Phy.s. Fluids, 10, 2120-2127 [1967]). 

ER = Entrainment ratio (or air equivalent). It is the ratio of the weight of gas handled to the weight of air which would be handled by the same ejector operating under the same conditions. 

Equation 1 will give results within 2% of the Reference 1 entrainment ratio curve. 

Entrainment ratio is another jet characteristic commonly used in air distribution design practice. Specifically, it is used in analytical multizone models (see Chapter 8) when one needs to evaluate the total airflow rate transported by the jet to some distance from a diffuser face. Airflow rate in the jet, Q,., can be derived by integrating the air velocity profile within the jet boundaries ... 

For a given area of diffuser opening Aq, the entrainment ratio is proportional to the distance jc (for compact, radial, and conical diffuser jets)... 

Figure 6-17. Temperature entrainment ratio curve. Reprinted by permission. Standards for Steam Jet Vacuum Systems 4th Ed., Heat Exchange Institute, Inc., 1988.

This metliod calculates the dry tray pressure drop and allows for correcting the two-phase flow effects at various entrainment ratios. 

Overflow Entrainment Ratio (kg/kg extracted livers) Mass fraction... 

Ejector. Gas chamber pressure needs to be known in order to calculate ejector power input. A semiempirical equation was developed by Henzler (10) that related the entrainment ratio to other system variables ... 

An important topic in azeotropic distillation regards the purity. This can be managed by means of both entrainer and reflux ratios. For a given purity there is a minimum entrainer ratio that can be determined from a RCM plot. In... 

The physical entrainment rate of gas varies over orders of magnitude as a function of jet stability, which acts as the surface shape generator. The controllable parameters of the system are nozzle geometry, nozzle velocity, nozzle height, jet length, and jet velocity. McCarthy et al. (Ml) have analyzed gas entrainment in such contactors in terms of the surface roughness of the jet and have proposed an entrainment ratio ... 

---