Influence analysis of pipe parameters of double elbow of fish suction device on pipe flow field based on liquid-solid coupling

2021 ◽  
Author(s):  
Song Yin ◽  
Pengyue Sun ◽  
Shujiang Wu ◽  
Qingfu Gong ◽  
Ming Gao
Keyword(s):  
Flow Field ◽  
Pipe Flow ◽  
Influence Analysis ◽  
Suction Device

Numerical and experimental investigation of exhaust manifold configurations of turbo-charged diesel engines

2020 ◽  
pp. 095765092097030
Author(s):  
Sheng Liu ◽  
Weilin Zhuge ◽  
Yangjun Zhang
Keyword(s):  
Flow Field ◽  
Pipe Flow ◽  
Energy Recovery ◽  
Fuel Efficiency ◽  
Branch Pipe ◽  
Exhaust Gas ◽  
Available Energy ◽  
Pulse Converter ◽  
Flow Loss ◽  
Exhaust Energy

The exhaust energy recovery is significant for engine fuel efficiency. However, the exhaust gas interference and the loss of flow affect the utilization of exhaust energy of multi cylinder turbocharged diesel engine seriously. In this paper, through Particle Image Velocimetry experiment and computational fluid dynamics simulation of exhaust T-junction flow field, the characteristics of junction local flow field and the law of energy loss are obtained. Based on the one dimensional simulation of engine working process, the exhaust available energy analysis is carried out, and the transmission of available energy of exhaust valve and various pipe systems under typical operating conditions is obtained. On this basis, five exhaust systems are designed, and the steady-state and transient performances are compared by bench tests. The results show that the shrinkage rate and the intersection angle of T-junction are the key factors affecting exhaust energy transmission and exhaust gas interference suppression. Reducing the branch pipe shrinkage rate leads to an increase in branch pipe flow loss, but it will also reduce the main pipe flow loss and exhaust gas interference. Reducing the angle between the main pipe and branch pipe is beneficial to the exhaust flow and exhaust energy recovery. The pulse converter exhaust system has a high exhaust available energy transmission rate; the Modular Pulse Converter system has superior fuel efficiency and transient response performance from the perspective of the entire engine operation range. The 90% response time difference between the five studied exhaust systems is about 0.41 s.

Flow of Yield Power Law Fluids in Horizontal Pipes-Flow Field Characterization Using Particle Image Velocimetry Technique

2021 ◽  
Author(s):  
Yanxin (Sussi) Sun ◽  
Abdulla Abou-Kassem ◽  
Majid Bizhani ◽  
Ergun Kuru
Keyword(s):  
Experimental Study ◽  
Flow Field ◽  
Velocity Profile ◽  
Yield Stress ◽  
Power Law ◽  
Pipe Flow ◽  
Hydrodynamic Behaviour ◽  
Yield Stress Fluids ◽  
Power Law Fluids ◽  
Flow Field Characteristics

Abstract Yield Power Law (YPL) rheological model is commonly used to describe the pipe and annular flow of drilling fluids. However, the hydrodynamic behaviour of fluids with yield stress are difficult to predict because they exhibit an inherent plug (solid like) region where the velocity gradient is zero. Moreover, it is not easy to identify the transition between this solid like and liquid regions. Theoretical studies have been conducted in the past to describe YPL fluid flow in pipes and annuli. As a result, several models have been proposed for determining flow field characteristics (e.g. velocity profile, plug width, etc.) and frictional pressure losses. However, most of these models have been validated by limited experimental and/or field data. Similar future modeling studies may benefit from more data collected under controlled experimental conditions. Therefore, we have conducted an experimental study to investigate the hydrodynamic behaviour of yield stress fluids under laminar pipe flow conditions and the results are presented in this paper. Water-based Yield Power Law fluids were prepared by using Carbopol® 940, a synthetic high-molecular-weight polyacrylic acid-based cross-linked polymer. Fluids with yield stresses varying from 0.75 Pa (1.56 lb/100 ft2) to 4.37 Pa (9.13 lb/100 ft2) were obtained by using Carbopol concentrations changing from 0.060% w/w to 0.073% w/w. A 9m long horizontal pipeline with, 95 mm diameter (ID) was used for the experiments. Reynolds number range varying from 97 to 1268 confirmed that all flow field characteristics measurements of YPL fluids were conducted under laminar flow regimes. Experimental study provided detailed information about pipe flow characteristics of yield stress fluids, including full annular velocity profile, near wall velocity profile, wall slip velocity and the plug region thickness. The study was concluded by comparing experimental results (i.e. full velocity profile, frictional pressure loss, and plug width) to predictions of models presented in the literature. Practical implications of the results have also been discussed by considering the hydraulic design of some practical field operations such as hole cleaning.

scholarly journals Flow Past Permeable Manipulator Ring Placed in a Turbulent Pipe Flow (1st Report, Mean Flow Field)

2006 ◽  
Vol 72 (723) ◽  
pp. 2695-2701
Author(s):  
Koji UTSUNOMIYA ◽  
Suketsugu NAKANISHI ◽  
Masaki MORISHITA ◽  
Hideo OSAKA
Keyword(s):  
Flow Field ◽  
Pipe Flow ◽  
Turbulent Pipe Flow ◽  
Mean Flow ◽  
Flow Past

Cooling Airflow Studies at the Leading Edge of a Film-Cooled Airfoil

1984 ◽  
Vol 106 (1) ◽  
pp. 214-221 ◽  
Author(s):  
E. S. Tillman ◽  
H. F. Jen
Keyword(s):  
Flow Field ◽  
Physical Model ◽  
Pipe Flow ◽  
Axial Flow ◽  
Leading Edge ◽  
External Flow ◽  
Total Flow ◽  
Momentum Ratio ◽  
Loss Coefficients ◽  
Flow Study

An experimental flow study on cooling holes in cylindrical models simulating the leading edge of a typical turbine airfoil is presented. The effect of external flow around the cylinder on the coolant discharge through a single hole is represented as a function of the momentum ratio of the cooling jet to the local external flow. A similar correlation was found for the effect of internal axial flow. The ability to separate the entrance and exit effects on the hole is due to the fact that the hole is a long orifice. The entrance and exit effects on the coolant flow are expressed as loss coefficients analogous to traditional loss coefficients in pipe flow. The loss coefficients for single holes were used to predict the total and individual flows through an array of holes in the presence of an external flow field. The total flow is predicted accurately as compared to the results of tests on arrays of holes. It can be concluded that the interaction between adjacent cooling holes is slight. The physical model can be used for coolant optimization studies.

scholarly journals Response of the Fully Developed Pipe Flow to Rough Wall Disturbance (Mean Flow Field)

2011 ◽  
Vol 77 (778) ◽  
pp. 1360-1372
Author(s):  
Aung Thuyein WIN ◽  
Shinsuke MOCHIZUKI ◽  
Takatsugu KAMEDA
Keyword(s):  
Flow Field ◽  
Pipe Flow ◽  
Rough Wall ◽  
Mean Flow

Numerical Simulation of Flow Field within Mutational Section Pipe

2012 ◽  
Vol 192 ◽  
pp. 190-195
Author(s):  
Jian Hua Zhang ◽  
Kun Hu ◽  
Yi Fan Xu
Keyword(s):  
Numerical Simulation ◽  
Flow Field ◽  
Pipe Flow ◽  
Gas Flow ◽  
Two Dimensional ◽  
One Dimensional ◽  
Compressed Gas ◽  
Interior Flow ◽  
Gas Flow Field

The section mutation of a pipe affects the interior flow field seriously. Numerical simulation of the two-dimensional steady gas flow field of two types of section mutation pipe was processed. By comparing it with equivalent section pipe’s interior flow field, the effects of section mutation of pipe on pressure distributing and velocity distributing were analyzed. The results are commendably consistent with the theories of one-dimensional adiabatic frictional pipe flow. Ensuring the section of the compressed gas pipe to be coherent and using the bell and spigot joint if necessary are presented.

Numerical Simulation on the Flow Field inside an Ultrasonic Water Meter

2013 ◽  
Vol 712-715 ◽  
pp. 1126-1130
Author(s):  
Hong Chen ◽  
Zhang Kai ◽  
Yao Ling ◽  
Hong Jun Zhang
Keyword(s):  
Flow Field ◽  
Cross Section ◽  
Pipe Flow ◽  
Field Data ◽  
Correction Coefficient ◽  
Mean Velocity ◽  
Flow Rates ◽  
Type Flow ◽  
Difference Type ◽  
Water Meter

Flow field inside an ultrasonic water meter of time-difference-type are numerically simulated at several flow rates. Linear mean velocity (LMV) averaged along the line between the transmitting transducer and the receiving one, and the surface mean velocity (SMV) averaged in the cross section of the reducing-type flow passage, and the flow correction coefficient are calculated with the flow field data obtained by the simulation. Its found that the values of flow correction coefficient for the reducing-type meter channel flow are quite different from that for a fully developed pipe flow, and are related to the flow rate or Reynolds number.

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