The Experts below are selected from a list of 267 Experts worldwide ranked by ideXlab platform
Hualin Wang - One of the best experts on this subject based on the ideXlab platform.
-
Discrete Method for design of flow distribution in manifolds
Applied Thermal Engineering, 2015Co-Authors: Junye Wang, Hualin WangAbstract:Abstract Flow in manifold systems is encountered in designs of various industrial processes, such as fuel cells, microreactors, microchannels, plate heat exchanger, and radial flow reactors. The uniformity of flow distribution in manifold is a key indicator for performance of the process equipment. In this paper, a Discrete Method for a U-type arrangement was developed to evaluate the uniformity of the flow distribution and the pressure drop and then was used for direct comparisons between the U-type and the Z-type. The uniformity of the U-type is generally better than that of the Z-type in most of cases for small ζ and large M . The U-type and the Z-type approach each other as ζ increases or M decreases. However, the Z-type is more sensitive to structures than the U-type and approaches uniform flow distribution faster than the U-type as M decreases or ζ increases. This provides a simple yet powerful tool for the designers to evaluate and select a flow arrangement and offers practical measures for industrial applications.
Gu Jian-nong - One of the best experts on this subject based on the ideXlab platform.
-
Numerical Method of supercaviting flow past a slender cone type projectile traveling in water at subsonic speed
Chinese Journal of Computational Mechanics, 2012Co-Authors: Gu Jian-nongAbstract:On the assumption that the ideal compressible fluid motion is irrotational and steady,supercavitating closure with the Riabushinsky scheme.An integro-differential equation for the supercavitating flow past a slender cone type projectile traveling in water at subsonic speed is derived based on the potential flow theory of hydrodynamics and the slender body theory.A numerical Discrete Method for solution of the integro-differential equation is developed,various initial solutions of supercavity profile are proposed and the influence on results are analyzed.The process of computation is optimized and the initial cavity solution for the first iteration is simplified.Compressibility influence of flow field on characteristic parameter of supercaviting flow is analyzed,while the Mach number exceeds 0.3,more remarkable increasement of supercavity shape and pressure coefficient on projectile surface and drag coefficient of projectile will occur.The calculated results about characteristic parameter of supercaviting flow are compared with relative theoretical and experimental ones,and a good agreement exists.
-
Numerical Method of supercaviting flow past a slender cone-type projectile traveling in incompressible fluid
Journal of Naval University of Engineering, 2011Co-Authors: Gu Jian-nongAbstract:By means of the ideal incompressible fluid motion which is irrotational and steady and supercavitating closure with the Riabushinsky scheme,an integro-differential equation was established for the supercavitating flow past a slender cone type projectile traveling in water based on the potential flow theory of hydrodynamics and the slender body theory.An numerical Discrete Method for solving the integro-differential equation was developed,and various initial solutions of supercavity profile were proposed and the influence on results were analyzed.The process of computation was optimized and the initial cavity solution for the first iteration was simplified.The calculated results about the characteristic parameters of supercaviting flow agree with the relative theoretical and experimental ones.
Junye Wang - One of the best experts on this subject based on the ideXlab platform.
-
Discrete Method for design of flow distribution in manifolds
Applied Thermal Engineering, 2015Co-Authors: Junye Wang, Hualin WangAbstract:Abstract Flow in manifold systems is encountered in designs of various industrial processes, such as fuel cells, microreactors, microchannels, plate heat exchanger, and radial flow reactors. The uniformity of flow distribution in manifold is a key indicator for performance of the process equipment. In this paper, a Discrete Method for a U-type arrangement was developed to evaluate the uniformity of the flow distribution and the pressure drop and then was used for direct comparisons between the U-type and the Z-type. The uniformity of the U-type is generally better than that of the Z-type in most of cases for small ζ and large M . The U-type and the Z-type approach each other as ζ increases or M decreases. However, the Z-type is more sensitive to structures than the U-type and approaches uniform flow distribution faster than the U-type as M decreases or ζ increases. This provides a simple yet powerful tool for the designers to evaluate and select a flow arrangement and offers practical measures for industrial applications.
Li Chen - One of the best experts on this subject based on the ideXlab platform.
-
A Digital-Discrete Method For Smooth-Continuous Data Reconstruction
arXiv: Numerical Analysis, 2010Co-Authors: Li ChenAbstract:A systematic digital-Discrete Method for obtaining continuous functions with smoothness to a certain order (C^(n)) from sample data is designed. This Method is based on gradually varied functions and the classical finite difference Method. This new Method has been applied to real groundwater data and the results have validated the Method. This Method is independent from existing popular Methods such as the cubic spline Method and the finite element Method. The new digital-Discrete Method has considerable advantages for a large number of real data applications. This digital Method also differs from other classical Discrete Methods that usually use triangulations. This Method can potentially be used to obtain smooth functions such as polynomials through its derivatives f^(k) and the solution for partial differential equations such as harmonic and other important equations.
-
Applications of the Digital-Discrete Method in Smooth-Continuous Data Reconstruction
arXiv: Numerical Analysis, 2010Co-Authors: Li ChenAbstract:This paper presents some applications using recently developed algorithms for smooth-continuous data reconstruction based on the digital-Discrete Method. The classical Discrete Method for data reconstruction is based on domain decomposition according to guiding (or sample) points. Then the Spline Method (for polynomial) or finite elements Method (for PDE) is used to fit the data. Our Method is based on the gradually varied function that does not assume the property of being linearly separable among guiding points, i.e. no domain decomposition Methods are needed. We also demonstrate the flexibility of the new Method and its potential to solve a variety of problems. The examples include some real data from water well logs and harmonic functions on closed 2D manifolds. This paper presents the results from six different algorithms. This Method can be easily extended to higher multi-dimensions. We also include an advanced consideration related to the use of gradually varied mapping.
Wendong Wang - One of the best experts on this subject based on the ideXlab platform.
-
theoretical analysis of the mechanism of fracture network propagation with stimulated reservoir volume srv fracturing in tight oil reservoirs
PLOS ONE, 2015Co-Authors: Long Ren, Fankun Meng, Wendong WangAbstract:Stimulated reservoir volume (SRV) fracturing in tight oil reservoirs often induces complex fracture-network growth, which has a fundamentally different formation mechanism from traditional planar bi-winged fracturing. To reveal the mechanism of fracture network propagation, this paper employs a modified displacement discontinuity Method (DDM), mechanical mechanism analysis and initiation and propagation criteria for the theoretical model of fracture network propagation and its derivation. A reasonable solution of the theoretical model for a tight oil reservoir is obtained and verified by a numerical Discrete Method. Through theoretical calculation and computer programming, the variation rules of formation stress fields, hydraulic fracture propagation patterns (FPP) and branch fracture propagation angles and pressures are analyzed. The results show that during the process of fracture propagation, the initial orientation of the principal stress deflects, and the stress fields at the fracture tips change dramatically in the region surrounding the fracture. Whether the ideal fracture network can be produced depends on the geological conditions and on the engineering treatments. This study has both theoretical significance and practical application value by contributing to a better understanding of fracture network propagation mechanisms in unconventional oil/gas reservoirs and to the improvement of the science and design efficiency of reservoir fracturing.