Acid dissolution hydrodynamic force analysis

2003 ◽  
Author(s):  
M A WHITE
Keyword(s):  
Hydrodynamic Force ◽  
Force Analysis ◽  
Acid Dissolution

Steady Hydrodynamic Force Analysis of Non-Circular Opening Hydraulic Spool Valve

2012 ◽  
Vol 220-223 ◽  
pp. 1657-1660
Author(s):  
Hao Huang ◽  
Xiong Li ◽  
Zhong Wei Sun
Keyword(s):  
Hydrodynamic Force ◽  
Differential Pressure ◽  
Circular Opening ◽  
Force Analysis ◽  
Mathematical Formula ◽  
Valve Structure ◽  
Valve Opening ◽  
Working Principle ◽  
Spool Valve ◽  
Hydraulic Valves

Hydrodynamic force is one of the important factors to be considered in the design of hydraulic valves. In this paper, mathematical formula of steady hydrodynamic force was deduced basing on non-circular opening spool valve structure and working principle. The simulations were carried out with software FLUENT at differential pressure, different valve port openings, and then the variation of the steady hydrodynamic force can be obtained. The results show that the direction of the steady hydrodynamic force is opposite to the movement of the valve spool and tends to close the valve port; the magnitude of the steady hydrodynamic force is proportional to the valve opening and differential pressure respectively.

Hydrodynamic force analysis of magnetite medium inside dense medium cyclone using multiphase GPU parallelized ASM model

2021 ◽  
Vol 170 ◽  
pp. 107061
Author(s):  
Mayank Kumar ◽  
Narasimha Mangadoddy ◽  
R. Banerjee ◽  
Gaekwad E. Sreedhar ◽  
Shiv Kumar Raparla ◽  
...  
Keyword(s):  
Hydrodynamic Force ◽  
Dense Medium ◽  
Force Analysis ◽  
Dense Medium Cyclone

PEMANFAATAN KULIT KAYU GEMOR (Alseodaphne sp.) DAN CANGKANG KEMIRI (Aleurites molucca) UNTUK OBAT NYAMUK ALAMI

2011 ◽  
Vol 3 (2) ◽  
pp. 13
Author(s):  
Budi Tri Cahyana ◽  
Andri Taruna Rachmadi
Keyword(s):  
Human Health ◽  
Chemical Compound ◽  
Variance Analysis ◽  
Force Analysis ◽  
Mosquito Coil ◽  
Research Product ◽  
Economic View ◽  
Hazelnut Shell ◽  
Random Variance ◽  
Main Material

Blood fever and Chikungunya cases in Indonesia are increasing annually. For preventing the mosquios, people use mosquito coil which is contain dangerous chemical compound. This research has successly created a natural mosquito coil with gemor bark and hazelnut fruit shell as the main material. Gemor bark is positive containing alcaloid,tanin, phenolk, flvonoid, triterpnoid and glycocydic compounds which are natural bioinsecticide. As formulation the comparison of gemor bark and hazelnut shell as follow :100% : 0 %  ; 80 % : 20 % ; 65 % : 35 % ; 50 % : 50 % ; 35 % : 65% and 20 % : 80% were used. Base one random variance analysis, the best formula was the using of gemor bark in 50%, 35% and  20% of concentration. The mosquitos killing force analysis was using the LT50 for 6 days with 5 diferent concentrations. The result showed that 50 %  of gemor bark was significantly influenced in the killing force. From the economic view, the producion of this coil was cheaper then the same product in the maket. Base on all the result, the research product is applicable in mass producion and safe for human health and the environment.Keywords: gemor bark , hazelnut fruit shell ,  mosquito coil, natural ,  ecofriendly

Intramolecular Proton Transfer in the Isomerization of Hydroxyacetone: A Detailed Characterization Based on Reaction Force Analysis and the Bond Fragility Spectrum

2020 ◽  
Author(s):  
Wallace Derricotte ◽  
Huiet Joseph
Keyword(s):  
Chemical Potential ◽  
Reaction Force ◽  
Intramolecular Proton Transfer ◽  
Intermediate Energy ◽  
Force Analysis ◽  
Activation Energy Barrier ◽  
Detailed Characterization ◽  
Proton Transfers ◽  
Reaction Force Constant

The mechanism of isomerization of hydroxyacetone to 2-hydroxypropanal is studied within the framework of reaction force analysis at the M06-2X/6-311++G(d,p) level of theory. Three unique pathways are considered: (i) a step-wise mechanism that proceeds through formation of the Z-isomer of their shared enediol intermediate, (ii) a step-wise mechanism that forms the E-isomer of the enediol, and (iii) a concerted pathway that bypasses the enediol intermediate. Energy calculations show that the concerted pathway has the lowest activation energy barrier at 45.7 kcal mol<sup>-1</sup>. The reaction force, chemical potential, and reaction electronic flux are calculated for each reaction to characterize electronic changes throughout the mechanism. The reaction force constant is calculated in order to investigate the synchronous/asynchronous nature of the concerted intramolecular proton transfers involved. Additional characterization of synchronicity is provided by calculating the bond fragility spectrum for each mechanism.

Acceptorless amine dehydrogenation and transamination using Pd-doped layered double hydroxides

2018 ◽  
Author(s):  
Diana Ainembabazi ◽  
Nan An ◽  
Jinesh Manayil ◽  
Kare Wilson ◽  
Adam Lee ◽  
...  
Keyword(s):  
Layered Double Hydroxides ◽  
Oxidation States ◽  
Secondary Amines ◽  
Primary Amines ◽  
Acid Dissolution ◽  
Oxidative Amination ◽  
Strong Function ◽  
Excellent Activity ◽  
High Yields ◽  
Double Hydroxides

<div> <p>The synthesis, characterization, and activity of Pd-doped layered double hydroxides (Pd-LDHs) for for acceptorless amine dehydrogenation is reported. These multifunctional catalysts comprise Brønsted basic and Lewis acidic surface sites that stabilize Pd species in 0, 2+, and 4+ oxidation states. Pd speciation and corresponding cataytic performance is a strong function of metal loading. Excellent activity is observed for the oxidative transamination of primary amines and acceptorless dehydrogenation of secondary amines to secondary imines using a low Pd loading (0.5 mol%), without the need for oxidants. N-heterocycles, such as indoline, 1,2,3,4-tetrahydroquinoline, and piperidine, are dehydrogenated to the corresponding aromatics with high yields. The relative yields of secondary imines are proportional to the calculated free energy of reaction, while yields for oxidative amination correlate with the electrophilicity of primary imine intermediates. Reversible amine dehydrogenation and imine hydrogenation determine the relative imine:amine selectivity. Poisoning tests evidence that Pd-LDHs operate heterogeneously, with negligible metal leaching; catalysts can be regenerated by acid dissolution and re-precipitation.</p> </div> <br>

ACID DISSOLUTION STUDIES USING BRAZILIAN SERPENTINITE ROCKS APPLIED MINERAL CARBONATION

2016 ◽  
Author(s):  
Kely Vieira ◽  
Kely Vieira ◽  
Gretta Larisa Aurora Arce Ferrufino ◽  
Ivonete Ávila ◽  
Carlos Manuel Romero Luna ◽  
...  
Keyword(s):  
Mineral Carbonation ◽  
Acid Dissolution ◽  
Dissolution Studies
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