Fundamentals of the hydrodynamic mechanism of splitting in dispersion processes

AIChE Journal ◽  
1955 ◽  
Vol 1 (3) ◽  
pp. 289-295 ◽  
Author(s):  
J. O. Hinze
Keyword(s):  
Hydrodynamic Mechanism

Note. Vacuum impregnation of banana (Musa acuminata cv. giant cavendish) / Nota. Impregnación a vacío de banana (Musa acuminata cv. giant cavendish

1998 ◽  
Vol 4 (2) ◽  
pp. 127-131 ◽  
Author(s):  
R. Sousa ◽  
D. Salvatori ◽  
A. Andrés ◽  
P. Fito
Keyword(s):  
Structural Changes ◽  
Musa Acuminata ◽  
Diameter Ratio ◽  
Dynamic Mechanism ◽  
Vacuum Impregnation ◽  
Local Market ◽  
Relaxation Phenomena ◽  
Pressure Gradients ◽  
Hydrodynamic Mechanism

Vacuum impregnation of banana was analysed by a hydrodynamic mechanism to determine effec tive porosity ( ∈e). In the initial experiments, the influence of the ripening degree and cut was deter mined without taking into account sample deformations caused by the pressure gradients; in these cases ∈ e decreased as maturity progressed. Important structural changes were observed 2-4 days after the bananas were purchased from the local market, probably due to the climacteric charac teristic of the product. Other experiments were carried out to analyse the coupling of the hydro dynamic mechanism (HDM) with deformation-relaxation phenomena (DRP) by varying the time of treatment; ε e values determined by this procedure were approximately 10.1% and significant deformation values in the vacuum step (γ e = 3.6%) were observed. The height/diameter ratio also seemed to influence the behaviour of the product to the HDM-DRP action. The most impregnated samples were the ones with a height half that of the banana diameter.

scholarly journals Physio-chemical hydrodynamic mechanism underlying the formation of thin adsorbed boundary films

2012 ◽  
Vol 156 ◽  
pp. 123 ◽  
Author(s):  
W. W. F. Chong ◽  
M. Teodorescu ◽  
H. Rahnejat
Keyword(s):  
Hydrodynamic Mechanism ◽  
Boundary Films

scholarly journals Head Drop of a Spatial Turbopump Inducer

2008 ◽  
Vol 130 (11) ◽  
Author(s):  
Nellyana Gonzalo Flores ◽  
Eric Goncalvès ◽  
Regiane Fortes Patella ◽  
Julien Rolland ◽  
Claude Rebattet
Keyword(s):  
Power Efficiency ◽  
Flow Analysis ◽  
Numerical Results ◽  
Good Prediction ◽  
Local Flow ◽  
Local Study ◽  
Blade Loading ◽  
Hydrodynamic Mechanism ◽  
Global And Local ◽  
Vapor Liquid

A computational fluid dynamics model for cavitation simulation was investigated and compared with experimental results in the case of a three-blade industrial inducer. The model is based on a homogeneous approach of the multiphase flow coupled with a barotropic state law for the cool water vapor/liquid mixture. The numerical results showed a good prediction of the head drop for three flow rates. The hydrodynamic mechanism of the head drop was investigated through a global and local study of the flow fields. The evolution of power, efficiency, and the blade loading during the head drop were analyzed and correlated with the visualizations of the vapor/liquid structures. The local flow analysis was made mainly by studying the relative helicity and the axial velocity fields. A first analysis of numerical results showed the high influence of the cavitation on the backflow structure.

Stern End Bulb for Energy Enhancement and Speed Improvement

2012 ◽  
Vol 28 (04) ◽  
pp. 172-181
Author(s):  
Gabor Karafiath
Keyword(s):  
Fluid Flow ◽  
Free Surface ◽  
Model Test ◽  
Computer Code ◽  
Inviscid Flow ◽  
Improve Performance ◽  
Maximum Resistance ◽  
Resistance Reduction ◽  
Hydrodynamic Mechanism ◽  
Lewis And Clark

Unlike the bow bulb, the stern end bulb (SEB) has been used on just a few ships to improve performance. In one of these rare, full-scale applications, a maximum resistance reduction in the 5% to 7% range is claimed. A few applications of SEBs are shown along with some model test data for a Naval Auxiliary ship. The rationale for SEB is discussed along with the hydrodynamic mechanism associated with a SEB. In addition to wave-making reduction, the SEB can reduce eddy-making and possibly improve course-keeping. The results of several fluid flow computations with initial SEB designs are shown for two ship classes: the T-AKE LEWIS and CLARK dry cargo ship and the DDG 51 ARLEIGH BURKE destroyer. The calculations use the Ship Wave Inviscid Flow Theory potential flow computer code and the FreeRans viscous flow free surface computer code. Several SEBs were designed and investigated analytically for the T-AKE class ships, and the best of these is predicted to reduce resistance by 4.5% at 20 knots. In addition, several initial SEB/Stern Flap configurations were designed for the DDG 51 Class Flight IIa destroyers and five configurations, some with just an SEB added to the hull and others with a combined SEB-Stern Flap configuration were model-tested. The examination of these initial efforts led to the design of several new-style combined SEB-Stern flap configurations, the best of which is predicted to save at least 745 Bbls of fuel per ship per year.

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