Numerical Simulation of Oil Mist Process in Cold Heading Machine

2010 ◽  
Vol 37-38 ◽  
pp. 739-742
Author(s):  
Gao Chun Xu ◽  
Qing Xi Hu ◽  
Li Min Li ◽  
Chun Xiang Dai
Keyword(s):  
Fluid Dynamics ◽  
Green Manufacturing ◽  
Stream Line ◽  
Mist Flow ◽  
Multi Phase Flow ◽  
Oil Mist ◽  
Simulation Results ◽  
Line Path ◽  
Multi Phase ◽  
Inlet Position

Based on control equations in fluid dynamics, the main thought of oil mist process for cold heading machine is proposed according to the idea of green manufacturing. The computation fluid dynamics (CFD) software is applied to simulate the multi-phase oil mist flow in control box. The simulation results give some figures including distribution and stream line path of multi-phase flow of oil mist in the control box. The results show that the inlet position of oil mist effects on its process and three types of control box are compared, from which the best type is obtained.

Challenging Areas in Flow Measurement

1988 ◽  
Vol 21 (8) ◽  
pp. 229-235 ◽  
Author(s):  
F C Kinghorn
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Flow Measurement ◽  
Oil And Gas ◽  
Phase Flow ◽  
Industrial Sectors ◽  
Wide Range ◽  
Multi Phase Flow ◽  
Special Solutions ◽  
Multi Phase

Flow measurement has many applications and a wide range of techniques is used. In many industrial sectors there are particular difficulties in measuring flowrate and often special solutions are required. Some of the problems in the oil and gas, biotechnology, automobile and water supply industries are described and the shortcomings or difficulties associated with the methods currently being used are identified. There are also numerous technical difficulties which span several industrial sectors and the topics of multi-phase flow, direct mass flow measurement, pipework configuration effects and computational fluid dynamics are covered, although it is recognised that these are only a few of a very much larger number of difficult areas.

Modelling of transient flow of piston ring-liner contact using synthetic lubricants

2021 ◽  
pp. 135065012110505
Author(s):  
Anastasios Zavos ◽  
Pantelis G Nikolakopoulos
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Piston Ring ◽  
Transient Flow ◽  
Lower Boundary ◽  
Phase Flow ◽  
Asperity Contact ◽  
Multi Phase Flow ◽  
Multi Phase ◽  
The Impact

The paper contains the results of the transient flow of piston ring conjunction of a single-cylinder motorbike engine. Calculations of piston ring forces, asperity contact and gas blow-by are determined in computational fluid dynamics. The stochastic model of Greenwood-Tripp approach is used to predict the load of asperities. The hydrodynamic friction is also calculated by means of computational fluid dynamics including the multi-phase flow through Rayleigh–Plesset equation and a discrete phase model for simulating nanoparticles interaction. The major contribution of this analysis is to specifically investigate the impact of the lubricant with additives and the corresponding transient effects such as hydrodynamic pressure, cavitation and lubricant film within the contact. The results indicate that to investigate realistic mechanisms of multi-phase flow in piston ring-liner contact, the contribution of nanoparticles should be matched with the type of lubricants. In addition, this advanced computational fluid dynamics model showed that nanoparticles motion is important in reciprocating line contacts, leading to lower boundary friction in the order of 8.8% than a simple model where cavitation and nanoparticles are ignored.

Assessment of Computational Fluid Dynamics for Predicting Possible Cavitation and Choked Flow Inside Excess Flow Valves

2020 ◽  
Author(s):  
Nafiseh Banazadeh-Neishabouri ◽  
Siamack A. Shirazi ◽  
Jud Smalley ◽  
Mike Lybarger
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Stokes Equations ◽  
Critical Conditions ◽  
Vapor Flow ◽  
Phase Flow ◽  
Flow Conditions ◽  
Choked Flow ◽  
Multi Phase Flow ◽  
Multi Phase

Abstract Cavitation and choked flow conditions can occur when high-pressure drops are encounters in various types of valves, which prevent them to work properly and may cause severe erosion damage inside the valves that decrease their lifetime. Prediction of these critical conditions leads to the prevention of cavitation and helps to improve the design of the valve geometries to delay and prevent these critical flow conditions. Computational Fluid Dynamics (CFD) is a powerful tool that can be used to simulate flow conditions and to predict the incipient of cavitation and consequently choked flow in the valve through solving the Time Averaged Navier-Stokes equations under multi-phase flow conditions. Therefore, CFD simulations have been conducted for two types of excess flow valves. The mixture multi-phase flow solution method along with the k-ε realizable turbulence model has been utilized to solve the behavior of vapor flow inside the valve and simulate the cavitation phenomenon. It was observed that CFD could capture the inception of cavitation and choked flow inside the valve successfully. Simulated CFD results also indicated a good agreement with experimental data that were obtained under lower pressure drop conditions. The effects of various inlet pressures on the cavitation intensity have been also studied, and it was concluded that at higher inlet pressure with constant pressure outlet the cavitation strength is greater than lower inlet pressures.

scholarly journals Special Issue “Fluid Dynamics, Multi-Phase Flow, and Thermal Recovery Methods”

Processes ◽  
2021 ◽  
Vol 9 (5) ◽  
pp. 842
Author(s):  
Abdolreza Kharaghani ◽  
Afshin Davarpanah
Keyword(s):  
Fluid Dynamics ◽  
Porous Media ◽  
Thermal Recovery ◽  
Phase Flow ◽  
Engineering Systems ◽  
Special Issue ◽  
Flow And Transport ◽  
Natural Processes ◽  
Multi Phase Flow ◽  
Multi Phase

Intricate fluid flow and transport phenomena in porous media are ubiquitous in natural processes and engineering systems [...]

Evaluation of the impact of multi-phase flow on reservoir signatures in the Wolfcamp shale

2020 ◽  
Vol 76 ◽  
pp. 103187
Author(s):  
C.R. Clarkson ◽  
B. Yuan ◽  
Z. Zhang ◽  
F. Tabasinejad ◽  
H. Behmanesh ◽  
...  
Keyword(s):  
Phase Flow ◽  
Multi Phase Flow ◽  
Multi Phase ◽  
The Impact

scholarly journals Global existence of solutions for a multi-phase flow: A drop in a gas-tube

2016 ◽  
Vol 13 (02) ◽  
pp. 381-415
Author(s):  
Debora Amadori ◽  
Paolo Baiti ◽  
Andrea Corli ◽  
Edda Dal Santo
Keyword(s):  
Global Existence ◽  
Existence Of Solutions ◽  
Inviscid Fluid ◽  
Phase Flow ◽  
Lagrangian Coordinates ◽  
Large Initial Data ◽  
Initial Value ◽  
Global Existence Of Solutions ◽  
Multi Phase Flow ◽  
Multi Phase

In this paper we study the flow of an inviscid fluid composed by three different phases. The model is a simple hyperbolic system of three conservation laws, in Lagrangian coordinates, where the phase interfaces are stationary. Our main result concerns the global existence of weak entropic solutions to the initial-value problem for large initial data.

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