Oscillating Mechanics by Vector Graphics Means to Explain Phase Balanceable Principle Basing on Tri-Port Oscillator

2014 ◽  
Vol 886 ◽  
pp. 398-401
Author(s):  
Wei Zhou Hou ◽  
Juan Ling Wang
Keyword(s):  
Phase Equilibrium ◽  
High Frequency ◽  
Equilibrium Conditions ◽  
Vector Graphics ◽  
Balance Condition

During studying tri-port oscillator in oscillating mechanics high-frequency circuit, we proposed a straight forward method named "vector graphics means" to explain this constitute oscillating mechanics principle. When the oscillating mechanics circuit meet tri-port oscillator amplitude balance condition, "emitter same and other electrode-reverse" becomes a principle to determine whether the composition of the phase equilibrium conditions are satisfied.

scholarly journals A Graphical Alternating Conditional Expectation to Predict Hydrate Phase Equilibrium Conditions for Sweet and Sour Natural Gases

2019 ◽  
Vol 2019 ◽  
pp. 1-15
Author(s):  
Hai-Quan Zhong ◽  
Qi-Long Yao ◽  
Yu Wang ◽  
Yu-Fa He ◽  
Zi-Han Li
Keyword(s):  
Phase Equilibrium ◽  
Natural Gas ◽  
Hydrate Formation ◽  
Equilibrium Conditions ◽  
Natural Gases ◽  
Alternating Conditional Expectation ◽  
Hydrate Phase ◽  
Ace Model ◽  
Data Points ◽  
Formation Phase

Natural gas hydrate has been widely of concern due to its great potential in application to address problems including gas storage, transmission, separation techniques, and also as energy resource. Accurate prediction of hydrate formation phase equilibrium conditions is essential for the optimized design during natural gas production, processing, and transportation. In this study, a novel graphical alternating conditional expectation (ACE) algorithm was proposed to predict hydrate formation phase equilibrium conditions for sweet and sour natural gases. The accuracy and performance of the presented ACE model were evaluated using 1055 data points (688, 249, and 118 data points for sweet natural gas, CO2-CH4, and H2S-CO2-CH4 systems, respectively) collected from literature. Meanwhile, a comparative study was conducted between the ACE model and commonly used correlations, including thirteen models for sweet natural gases, three models for CO2-CH4 binary system, and seven thermodynamic models for H2S-CO2-CH4 ternary system. The obtained results indicated that the proposed ACE model produces the best results in prediction of hydrate phase equilibrium temperature for sweet natural gases and pressure for CO2-CH4 system with average absolute relative deviation (AARD) of 0.134% and 2.75%, respectively. The proposed quick and explicit ACE model also provides a better performance in prediction of hydrate phase equilibrium pressure for H2S-CO2-CH4 ternary systems with AARD=5.20% compared with seven thermodynamic methods considered in this work, except for CPA/Electrolyte/Chen–Guo combined model (AARD=4.45%).

Three-Phase Equilibrium Conditions of TiAAB Semiclathrates Formed from N2, CO2, and Their Mixtures

2012 ◽  
Vol 57 (8) ◽  
pp. 2322-2327 ◽  
Author(s):  
A. Majumdar ◽  
B. Maini ◽  
P. R. Bishnoi ◽  
M. A. Clarke
Keyword(s):  
Phase Equilibrium ◽  
Equilibrium Conditions ◽  
Three Phase

Measurement of Latent Heat of Tetra-n-Butyl Ammonium Bromide Hydrate and Specific Enthalpy of Its Slurry

2015 ◽  
Vol 23 (03) ◽  
pp. 1550025 ◽  
Author(s):  
Hiroyuki Kumano ◽  
Tatsunori Asaoka ◽  
Tatsuya Hayashi ◽  
Peng Zhang
Keyword(s):  
Aqueous Solution ◽  
Phase Equilibrium ◽  
Specific Heat ◽  
Latent Heat ◽  
Specific Enthalpy ◽  
Ammonium Bromide ◽  
Equilibrium Conditions ◽  
Hydrate Form ◽  
Latent Heats ◽  
Storage Characteristics

The specific heat of a tetra-n-butyl ammonium bromide (TBAB) aqueous solution, the latent heat of a TBAB hydrate, and the specific enthalpy of a TBAB hydrate slurry were measured to understand the thermal storage characteristics of TBAB hydrate slurry. A solution sample and the hydrate slurry were heated, the change in temperature was measured, and the specific heat of the TBAB aqueous solution and the specific enthalpy of the hydrate slurry were obtained from the change in temperature. Two types of TBAB hydrate form. Therefore, the hydrates were separated from the hydrate slurry formed from TBAB aqueous solution having several initial concentrations. The hydrate crystals were placed into solution, and the latent heats were obtained from the temperature change of the solution. The specific enthalpy of the hydrate slurry was estimated from the latent heats of the hydrate crystals and the specific heat of the solution under phase equilibrium conditions, and the measured and estimated values were compared.

Phase Equilibrium Conditions for Krypton Clathrate Hydrate below the Freezing Point of Water

2011 ◽  
Vol 56 (1) ◽  
pp. 58-61 ◽  
Author(s):  
Yusuke Jin ◽  
Kaoru Matsumoto ◽  
Jiro Nagao ◽  
Wataru Shimada
Keyword(s):  
Phase Equilibrium ◽  
Freezing Point ◽  
Clathrate Hydrate ◽  
Equilibrium Conditions

scholarly journals Simulation Study on the Influence of Gas Mole Fraction and Aqueous Activity under Phase Equilibrium

Processes ◽  
2019 ◽  
Vol 7 (2) ◽  
pp. 58 ◽  
Author(s):  
Weilong Zhao ◽  
Hao Wu ◽  
Jing Wen ◽  
Xin Guo ◽  
Yongsheng Zhang ◽  
...  
Keyword(s):  
Phase Equilibrium ◽  
Aqueous Phase ◽  
Mole Fraction ◽  
Equilibrium Conditions ◽  
Average Deviation ◽  
Unifac Model ◽  
Data Regression ◽  
Three Phase ◽  
Equilibrium Data ◽  
Equilibrium Experiment

This work explored the influence of gas mole fraction and activity in aqueous phase while predicting phase equilibrium conditions. In pure gas systems, such as CH4, CO2, N2 and O2, the gas mole fraction in aqueous phase as one of phase equilibrium conditions was proposed, and a simplified correlation of the gas mole fraction was established. The gas mole fraction threshold maintaining three-phase equilibrium was obtained by phase equilibrium data regression. The UNIFAC model, the predictive Soave-Redlich-Kwong equation and the Chen-Guo model were used to calculate aqueous phase activity, the fugacity of gas and hydrate phase, respectively. It showed that the predicted phase equilibrium pressures are in good agreement with published phase equilibrium experiment data, and the percentage of Absolute Average Deviation Pressures are given. The water activity, gas mole fraction in aqueous phase and the fugacity coefficient in vapor phase are discussed.

Wave Analysis for In-Plane Vibration of Angular and Curved Frames

2021 ◽  
Vol 143 (6) ◽  
Author(s):  
B. K. Syam ◽  
Abhijit Sarkar
Keyword(s):  
High Frequency ◽  
Computational Simulation ◽  
Fem Simulation ◽  
Present Formulation ◽  
Excellent Correlation ◽  
Equilibrium Conditions ◽  
Reflection And Transmission ◽  
Structural Applications ◽  
Commercial Package ◽  
Computationally Intensive

Abstract In many structural applications like bridges, arches, etc., frames are used, and it is important to study their dynamic behavior. Finite element method (FEM) is usually used for computational simulation of vibration for such frame structures. However, FEM simulations for high frequency are computationally intensive and lack accuracy. This paper proposes a wave propagation-based approach for the vibration analysis of a frame having angular and curved joints. The reflection and transmission matrices for the joints are derived using the kinematic compatibility and equilibrium conditions. Reflection, transmission, and propagation matrices are assembled leading to matrix equation terms of the wave amplitudes. Modal analysis and harmonic analysis of frames having curved and angular joints are performed using the present formulation. The frequency response function for point harmonic forcing acting on such structures is also presented. The formulation and the results are non-dimensionalized for wider applicability. The results obtained using the present formulation are compared with those obtained through FEM simulation in a commercial package. It is found that the results obtained using the two methods are in excellent correlation. The computational efficiency of the present method over FEM simulation is also reported.

Differential Scanning Calorimetry Research of Hydrates Phase Equilibrium in Porous Media

2012 ◽  
Vol 512-515 ◽  
pp. 2122-2126
Author(s):  
Qiang Chen ◽  
Chang Ling Liu ◽  
Yu Guang Ye
Keyword(s):  
Differential Scanning Calorimetry ◽  
Porous Media ◽  
Phase Equilibrium ◽  
South China Sea ◽  
Pore Water ◽  
South China ◽  
Pure Water ◽  
Scanning Calorimetry ◽  
Equilibrium Conditions ◽  
China Sea

In this paper, we focused on the determination of phase equilibrium conditions of hydrates formed in the pore water and porous media from South China Sea. High pressure differential scanning calorimetry (HP DSC), a relatively new thermo-analytical technique was applied to this research. During the study, nitrogen hydrates and methane hydrates phase equilibrium conditions were determined in thewater-hydrates- gas (W-H-G) system. Then a series of experiments were carried on using core sample drilled from South China Sea to determine the phase equilibrium properties in pore water and porous media systems. It show that the hydrates phase equilibrium point is about 2K lower than in pure water from pressure range 10 to 30 MPa, due to the thermodynamic inhibition effect of brine solution.

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