scholarly journals Numerical Simulation of Conjugate Heat Exchange at Gas Flowing in a Well

2021 ◽  
Vol 346 ◽  
pp. 03039
Author(s):  
Michael Al’es ◽  
Sergey Makarov ◽  
Alexandr Karpov
Keyword(s):  
Numerical Simulation ◽  
Heat Exchange ◽  
Natural Gas ◽  
Gas Flow ◽  
Thermal Conditions ◽  
Gas Flows ◽  
Flow Temperature ◽  
Boundary Layer Equations ◽  
Stationary Formulation ◽  
Conjugate Heat Exchange

A mathematical model is offered for conjugate heat exchange when gas flows in the section of a vertical well. The motion of the medium is described using a two-dimensional axisymmetric stationary formulation based on boundary-layer equations. The turbulent gas flowing due to the reservoir energy is considered. Natural gas is taken as a travelling medium. The numerical simulation results are presented in the form of the dependences of the flow temperature and gas density along the radius of the well on the external factors of the heat exchange changing along the well height. The results describe the thermobaric state of the well in the condition of the conjugate heat exchange of the produced natural gas flow and tubed well depending on the external thermal conditions.

scholarly journals Numerical simulation of conjugated heat exchange in the turbulent motion of fluid in an oil well

2020 ◽  
Vol 329 ◽  
pp. 03013
Author(s):  
Michael Al’es ◽  
Sergey Makarov ◽  
Alexandr Karpov
Keyword(s):  
Heat Exchange ◽  
Mass Fraction ◽  
Oil Well ◽  
Two Dimensional ◽  
Formation Water ◽  
Dissolved Gas ◽  
Boundary Layer Equations ◽  
Stationary Formulation ◽  
Conjugate Heat Exchange ◽  
The Mathematical Model

The mathematical model of conjugate heat exchange is proposed for the turbulent movement of reservoir oil in a vertical well section. The motion of the medium is described using a two-dimensional axisymmetric stationary formulation and boundary layer equations. The movement of the turbulent flow of reservoir oil due to reservoir energy is presented. The liquid medium is a mixture of reservoir oil with dissolved gas and formation water. The results of the numerical modeling are presented in the form of dependences of the changing flow rate, temperature, and mass fraction of paraffin deposits that occur along the full vertical extent of the well. The results obtained describe the thermobaric state of the well under the condition of conjugate heat exchange between the fluid flow and the production pipe.

scholarly journals Applications of Accurate Isentropic Exponent Determination for Fuel Gas Measurement

1995 ◽  
Author(s):  
David J. Pack ◽  
Terry J. Edwards ◽  
Derek Fawcett
Keyword(s):  
Natural Gas ◽  
Gas Flow ◽  
Precise Measurement ◽  
Gas Flows ◽  
Fuel Gas ◽  
Isentropic Exponent ◽  
Natural Gas Transmission ◽  
Gas Measurement ◽  
Cost Penalty

This paper discusses the determination and application of the isentropic exponent to the various thermodynamic processes found in a high pressure natural gas transmission system. Increasing demands for more precise measurement of natural gas, coupled with the need for greater efficiency and accountability of transportation and processing operations had led to our research and development efforts into the more precise measurement of gas flow, and the determination of gas thermodynamic properties including isentropic exponent. The isentropic exponent has many applications, some of which include: • the determination of the expansion factor ϵ, for calcuation of flow using an orifice or venturi type meter; • the volumetric efficiency in a reciprocating compressor; • the determination of the compression head for a centrigual compressor; • the engine power required for the set given conditions for gas compressor; • the calculation of discharge temperatures for compressors; and • the direct measurement of gas density. As can be appreciated, the application of an incorrect value for the isentropic exponent represents an error in the parameter determined. For large volume gas flows, this can translate into a significant cost penalty.

Influence of selected parameters on phenomena of two-phase flow and heat exchange in TSL furnace – numerical investigation

2017 ◽  
Vol 27 (12) ◽  
pp. 2799-2815
Author(s):  
Ewa Kolczyk ◽  
Zdzisław Miczkowski ◽  
Józef Czernecki
Keyword(s):  
Numerical Simulation ◽  
Heat Exchange ◽  
Liquid Slag ◽  
Gas Flow ◽  
Two Phase Flow ◽  
New Technology ◽  
Phase Flow ◽  
Two Phase ◽  
Content Type ◽  
Submerged Lance

Purpose The purpose of this study is application of a numerical simulation for determination of the influence of geometric parameters of a furnace and hydrodynamics of the gas introduced by a vertical submerged lance on the process of feed mixing and temperature distribution. Design/methodology/approach A numerical simulation with Phoenics software was applied for modeling of liquid phase movement and heat exchange between the gas supplied through a lance and the slag feed in a top submerged lance (TSL) furnace. The simulation of a two-phase flow of a slag–gas mixture based on the inter phase slip algorithm module was conducted. The influence of selected parameters, such as depth of lance submergence, gas flow rate and change of furnace geometry, on the phenomena of movement was studied. Findings Growth of dynamics of mixing with the depth of lance submergence and with increase of gas velocity in the lance was observed. Formation of a recirculation zone in the liquid slag was registered. Movement of the slag caused by the gas flow brought homogenization of the temperature field. Originality/value The study applied the simulation of a two-phase flow in the liquid slag–gas system in steady state, taking into account heat transfer between phases. It provides possibilities for optimization and selection of process parameters within the scope of the developed new technology using a TSL furnace.

Numerical simulation of natural gas flows in diffusers for supersonic separators

Energy ◽  
2012 ◽  
Vol 37 (1) ◽  
pp. 195-200 ◽  
Author(s):  
Chuang Wen ◽  
Xuewen Cao ◽  
Yan Yang ◽  
Wenlong Li
Keyword(s):  
Numerical Simulation ◽  
Natural Gas ◽  
Gas Flows

scholarly journals Calculation of a 3D turbulent flow in aircraft gas turbine engine ducts

2020 ◽  
Vol 2020 (4) ◽  
pp. 65-71
Author(s):  
Yu.A. Kvasha ◽  
Keyword(s):  
Numerical Simulation ◽  
Turbulent Flow ◽  
Gas Turbine ◽  
Gas Flow ◽  
Turbine Engines ◽  
Gas Flows ◽  
Gas Turbine Engines ◽  
Compressor Inlet ◽  
Air Intake ◽  
Engine Compressor

This work is devoted to the development of approaches to the numerical simulation of 3D turbulent gas flows in different ducts of aircraft gas turbine engines, in particular in inlet device ducts. Inlet devices must provide large values of the total pressure recovery factor and flow uniformity at the engine compressor inlet. The aim of this work is the verification of the operability of a technique developed earlier for the calculation of the parameters of a 3D turbulent flow in complex-shape ducts. The basic approach is a numerical simulation of 3D turbulent gas flows on the basis of the complete averaged Navier¬–Stokes equations and a two-parameter turbulence model. The proposed technique of numerical simulation of a 3D gas flow was tested by calculating a 3D laminar flow in a square pipe bent at a right angle. The calculated flow pattern is in satisfactory agreement with the experimental data on the flow structure in a pipe elbow reported in the literature. Based on a numerical simulation of a 3D turbulent flow in the air duct of one of the air intake configurations for an aircraft turboprop engine, the efficiency of that configuration is assessed. The calculated flow parameter nonuniformity at the air intake outlet, i. e., at the compressor inlet, is compared with that obtained earlier for another air intake configuration for the same engine. It is pointed out that the air intake configuration considered earlier provides a much more uniform flow parameter distribution at the engine compressor inlet. On the whole, this work shows that the quality of subsonic air intakes for aircraft gas turbine engines can be assessed using the proposed numerical technique of 3D gas flow simulation. The results obtained may be used in the aerodynamic improvement of inlet devices for aircraft engines of different types.

Numerical Simulation of Liquefied Natural Gas in Rib-Tube

2013 ◽  
Vol 483 ◽  
pp. 162-165
Author(s):  
Su Hou De ◽  
Zhang Yu Fu ◽  
Ji Yong Che ◽  
Xiao Long Wen
Keyword(s):  
Heat Transfer ◽  
Numerical Simulation ◽  
Fluid Flow ◽  
Heat Exchange ◽  
Natural Gas ◽  
Liquefied Natural Gas ◽  
Dispersed Phase ◽  
Wall Function ◽  
Governing Equations ◽  
Set Up

The flow of liquefied natural gas (LNG) which was coupled between heat transfer and fluid-flow in rib-tube was studied in this paper. Based on theoretical analysis, the model and wall-function were chosen to simulate the flow field of rib-tube, and the multiphase flow was described by the mixture model, in which the dispersed phase was defined by different velocity. In addtion, self-defining functions were used and governing equations were set up to solve the dispersed phase, and the result were compared with the experiment. The process of fluid-flow and heat exchange on rib-tube was simulated, and the contours of temperature, pressure, velocity, gas fraction were obtained, which showed that, the parameters of above changed when the temperature was rising and the LNG evaporating along the rib-tube, and a mixed process existed in the middle of the heat tube.

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