Nozzle Injection Characteristics of Visco-Elastic Fluids

It can divide the atomization effect in the direction of the nozzle axial injection into the jet area and the non-jet area by using the second crushing theory. On this basis, according to the feed liquid atomization particles discrete degree index of characteristics particle size of feed liquid atomization, it divides the injection zone into the atomization area and the diffusion area, so as to realize the axial direction of jet nozzle injection zone, atomization zone and the diffusion zone accurately. Simulation and experiment are used to verify the three zones of atomization nozzle. The division of three zones drives the study from the whole space of liquid distribution in the roller to atomization zone, clears the key zone of the roller in tobacco primary processing, and provides a basis for further work.

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Optimization of Direct Nozzle Injection System for Site-Specific Herbicide Application

10.13031/2013.22906 ◽

2007 ◽

Cited By ~ 3

Author(s):

Jiri Vondricka ◽

Peter Hloben ◽

Peter Schulze Lammers

Keyword(s):

Injection System ◽

Herbicide Application ◽

Site Specific ◽

Nozzle Injection

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Nonisothermal retardation of elastic fluids

Journal of Engineering Physics ◽

10.1007/bf00827724 ◽

1982 ◽

Vol 43 (1) ◽

pp. 756-757

Author(s):

A. N. Prokunin ◽

V. D. Sevruk

Keyword(s):

Elastic Fluids

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ON THE CHANGE OF TEMPERATURE CONSEQUENT ON ANY CHANGE IN THE DENSITY OF ELASTIC FLUIDS, CONSIDERED ESPECIALLY WITH REFERENCE TO STEAM.

Transactions of the Institution of Civil Engineers ◽

10.1680/itrcs.1836.24500 ◽

1836 ◽

Vol 1 (1836) ◽

pp. 219-225

Author(s):

T WEBSTER

Keyword(s):

Elastic Fluids

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Onset of Thermal Instabilities in the Plane Poiseuille Flow of Weakly Elastic Fluids: Viscous Dissipation Effects

Fluids ◽

10.3390/fluids6120432 ◽

2021 ◽

Vol 6 (12) ◽

pp. 432

Author(s):

Silvia C. Hirata ◽

Mohamed Najib Ouarzazi

Keyword(s):

Linear Stability ◽

Viscous Dissipation ◽

Viscoelastic Fluid ◽

Poiseuille Flow ◽

Hydrodynamic Instability ◽

Plane Poiseuille Flow ◽

Volumetric Heating ◽

Fluid Elasticity ◽

Different Temperatures ◽

Elastic Fluids

The onset of thermal instabilities in the plane Poiseuille flow of weakly elastic fluids is examined through a linear stability analysis by taking into account the effects of viscous dissipation. The destabilizing thermal gradients may come from the different temperatures imposed on the external boundaries and/or from the volumetric heating induced by viscous dissipation. The rheological properties of the viscoelastic fluid are modeled using the Oldroyd-B constitutive equation. As in the Newtonian fluid case, the most unstable structures are found to be stationary longitudinal rolls (modes with axes aligned along the streamwise direction). For such structures, it is shown that the viscoelastic contribution to viscous dissipation may be reduced to one unique parameter: γ=λ1(1−Γ), where λ1 and Γ represent the relaxation time and the viscosity ratio of the viscoelastic fluid, respectively. It is found that the influence of the elasticity parameter γ on the linear stability characteristics is non-monotonic. The fluid elasticity stabilizes (destabilizes) the basic Poiseuille flow if γ<γ* (γ>γ*) where γ* is a particular value of γ that we have determined. It is also shown that when the temperature gradient imposed on the external boundaries is zero, the critical Reynolds number for the onset of such viscous dissipation/viscoelastic-induced instability may be well below the one needed to trigger the pure hydrodynamic instability in weakly elastic solutions.

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