TRANSITION FUNCTION METHOD OF NUMERICAL SIMULATION FOR NONEQUILIBRIUM STEAM CONDENSATION FLOW

2002 ◽  
Vol 38 (10) ◽  
pp. 24 ◽  
Author(s):  
Dongyang Zhang
Keyword(s):  
Numerical Simulation ◽  
Function Method ◽  
Transition Function ◽  
Steam Condensation ◽  
Condensation Flow

scholarly journals A scalable algorithm for the decomposition of minimally rigid graph

2020 ◽  
Vol 53 (5-6) ◽  
pp. 807-813
Author(s):  
Yadong Zhu ◽  
Qin Wang ◽  
Shengquan Li ◽  
Yuequan Yang
Keyword(s):  
Numerical Simulation ◽  
Equilibrium Problem ◽  
Spanning Tree ◽  
Formation Control ◽  
Function Method ◽  
Scalable Algorithm ◽  
Navigation Function ◽  
Multi Agent

The rigid graph needs to be decomposed to solve the multi-equilibrium problem of the multi-agent formation control based on navigation function method. In this paper, a theorem and a scalable algorithm based on the Henneberg sequence of graphs are proposed for the decomposition of minimally rigid graph. The theorem demonstrates that if graph G( V, E) is a minimally rigid graph, then it can be decomposed as G = Gt[Formula: see text] Gc, where G t is a spanning tree of G and G c contains the remaining edges and their vertices. Moreover, the scalable algorithm is given to construct G t = ( V t, E t) and G c = ( V c, E c), and assign the edges in E c to n -- 2 distinct vertices in a scalable way via communication. Furthermore, a lemma is given to show when the number of vertices is less than eight, any edge can be chosen as the initialized edge, and the scalable algorithm mentioned above is always feasible. Finally, the effectiveness of the scalable algorithm is verified by numerical simulation.

scholarly journals Numerical simulation of steam condensation in a nozzle

2012 ◽  
Vol 25 ◽  
pp. 01020 ◽  
Author(s):  
Jan Halama ◽  
Jaroslav Fort
Keyword(s):  
Numerical Simulation ◽  
Steam Condensation

Seasonal Soil Freezing Characters in Daxinganling

2013 ◽  
Vol 652-654 ◽  
pp. 1668-1672
Author(s):  
Lin Ding ◽  
Yan Jie Liu ◽  
Yi Mei Min
Keyword(s):  
Thermal Conductivity ◽  
Numerical Simulation ◽  
Moisture Content ◽  
Laboratory Test ◽  
Transition Function ◽  
Ground Temperature ◽  
Soil Freezing ◽  
Seasonal Freezing ◽  
Freezing Soil ◽  
Water Behavior

For understanding the transport of groundwater existing in the seasonal freezing soil，laboratory test and field monitoring (frozen depth、moisture content and ground temperature in five months) were carried out in Daxinganling. A translocation model is built to analyze water behavior. The result shows that thermal conductivity will increase approximately one percent when temperature decreases 1°C. A transition function is used to prevent non-convergence in the numerical simulation. The simulation proves that the modified numerical simulation can reveal the law of moisture and heat translocation, and further offer guidance in practice.

An Experimental Study on Thermal Hydraulic Characteristics of a Steam Condensation Flow in a Circular Microtube

2011 ◽  
Author(s):  
Koji Iiyama ◽  
Akiko Kaneko ◽  
Yutaka Abe ◽  
Shingo Asaba ◽  
Yutaka Suzuki
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Coefficient ◽  
Heat Exchanger ◽  
Slug Flow ◽  
Annular Flow ◽  
Hydraulic Characteristics ◽  
Steam Condensation ◽  
Microchannel Heat Exchanger ◽  
Overall Heat Transfer Coefficient ◽  
Condensation Flow

At present, a microchannel heat exchanger is requested to achieve high efficiency in small size energy equipments. In order to clarify the heat transfer mechanism in a microchannel heat exchanger, knowledge on the thermal hydraulic characteristics of condensation flow in channels is essential. However, study on the thermal hydraulic characteristics of steam condensation flow in a microchannel is hardly conducted except visualization of flow patterns. Especially, the number of study on the correlation between the flow structure and heat transfer is small. The objective of the present study is to clarify the thermal hydraulic characteristics of condensation flow in a microtube through the observation of condensation behavior. In order to achieve the purpose, overall heat transfer coefficient in annular flow and slug flow is measured. As the results, the observed flow pattern is transformed from annular flow to bubbly flow through injection flow in a single capillary glassy tube as simulated unit microchannel. And the local overall heat transfer coefficient at slug flow is 10 to 25% lower than that at the annular flow under the particular condition in the present study.

On mathematical analysis of a discrete electrical lattice with nonlinear dispersion

2021 ◽  
pp. 2150076
Author(s):  
A. Elhassanein ◽  
S. Owyed ◽  
M. A. Abdou ◽  
Mustafa Inc
Keyword(s):  
Numerical Simulation ◽  
Mathematical Analysis ◽  
Discrete System ◽  
Function Method ◽  
Equilibrium Points ◽  
Expansion Method ◽  
Hopf Bifurcations ◽  
Continuous Approximation ◽  
Nonlinear Dispersion ◽  
New Exact Solutions

In this paper, we consider the discrete electrical lattice with nonlinear dispersion described by Salerno equation, Fig. 1. Stability of equilibrium points, limit cycles and flip and Hopf bifurcations of the system are discussed. New exact solutions of a continuous approximation of the discrete system in the upper forbidden band gap are obtained by two methods, namely, [Formula: see text]-expansion function method and [Formula: see text] expansion method. Numerical simulation is used to follow the dynamics of the system and to investigate its physical properties.

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