Computational Study of the Multiphase Flow and Performance of Hydrocyclones: Effects of Cyclone Size and Spigot Diameter

2013 ◽  
Vol 52 (45) ◽  
pp. 16019-16031 ◽  
Author(s):  
M. Ghodrat ◽  
S. B. Kuang ◽  
A. B. Yu ◽  
A. Vince ◽  
G. D. Barnett ◽  
...  
Keyword(s):  
Multiphase Flow ◽  
Computational Study ◽  
And Performance

Computational study of the multiphase flow and performance of dense medium cyclones: Effect of body dimensions

2011 ◽  
Vol 24 (1) ◽  
pp. 19-34 ◽  
Author(s):  
B. Wang ◽  
K.W. Chu ◽  
A.B. Yu ◽  
A. Vince ◽  
G.D. Barnett ◽  
...  
Keyword(s):  
Multiphase Flow ◽  
Computational Study ◽  
Dense Medium ◽  
Body Dimensions ◽  
And Performance

Computational study of viscous effects on lobed mixer flow features and performance

1996 ◽  
Vol 12 (3) ◽  
pp. 449-456 ◽  
Author(s):  
M. N. O'Sullivan ◽  
J. K. Krasnodebski ◽  
I. A. Waitz ◽  
E. M. Greitzer ◽  
C. S. Tan ◽  
...  
Keyword(s):  
Computational Study ◽  
Viscous Effects ◽  
Flow Features ◽  
And Performance

Computational Study of the Electronic Performance of Cross-Plane Superlattice Peltier Devices

2011 ◽  
Vol 1314 ◽  
Author(s):  
Changwook Jeong ◽  
Gerhard Klimeck ◽  
Mark Lundstrom
Keyword(s):  
Seebeck Coefficient ◽  
Computational Study ◽  
Oscillatory Behavior ◽  
Electrical Performance ◽  
Simulation Code ◽  
Performance Benchmarking ◽  
Peltier Cooler ◽  
Electronic Performance ◽  
Quantum Mechanical Effects ◽  
And Performance

ABSTRACTWe use a state-of-the-art non-equilibrium quantum transport simulation code, NEMO-1D, to address the device physics and performance benchmarking of cross-plane superlattice Peltier coolers. Our findings show quantitatively how barriers in cross-plane superlattices degrade the electrical performance, i.e. power factor. The performance of an In0.53Ga0.47As/In0.52Al0.48As cross-plane SL Peltier cooler is lower than that of either a bulk In0.53Ga0.47As or bulk In0.52Al0.48As device, mainly due to quantum mechanical effects. We find that a cross-plane SL device has a Seebeck coefficient vs. conductance tradeoff that is no better than that of a bulk device. The effects of tunneling and phase coherence between multi barriers are examined. It is shown that tunneling, SL contacts, and coherency only produce oscillatory behavior of Seebeck coefficient vs. conductance without a significant gain in PF. The overall TE device performance is, therefore, a compromise between the enhanced Seebeck coefficient and degraded conductance.

Multiphase Flow in a Liquid-Ring Vacuum Pump

2020 ◽  
Vol 143 (1) ◽  
Author(s):  
Ashutosh Pandey ◽  
Sajid Khan ◽  
Rick Dekker ◽  
Tom I-P. Shih
Keyword(s):  
Multiphase Flow ◽  
Rotational Speed ◽  
Computational Study ◽  
Critical Role ◽  
Expansion Ratio ◽  
Navier Stokes ◽  
Compression And Expansion ◽  
Acceleration And Deceleration ◽  
The Difference ◽  
Liquid Ring

Abstract A computational study based on unsteady Reynolds-averaged Navier–Stokes that resolves the gas–liquid interface was performed to examine the unsteady multiphase flow in a liquid-ring pump as a function of its inlet pressure (10, 40, and 80 kPa) and its impeller's rotational speed (1150, 1450, and 1750 rpm). Results obtained show the shape of the liquid ring to play a critical role in creating the expansion ratio needed to draw air into the pump and the compression ratio needed to expel air out of the pump. The dominant processes that determine the shape of the liquid ring was found to be the centrifugal force from rotation, the acceleration and deceleration due to the difference in pressure at the pump's inlet and outlet, and the eccentricity of the impeller relative to the pump's housing. Results are presented to show how the rotational speed of the impeller and the pressure at the pump's inlet affect the nature of the multiphase flow in the pump as well as the pump's effectiveness in creating a vacuum. The effects of heat transfer on the gas phase during the compression and expansion processes were found to be approximated well by polytropic processes. This computational study was validated by comparing computed with measured volumetric flowrates ingested through the suction port and the torque exerted on the pump's impeller.

Investigation on Flow Characteristics and Performance of a Vertical Axis Wind Turbine With Deflector Plates

2019 ◽  
Author(s):  
K. Karthik Selva Kumar ◽  
Vinayak Kulkarni ◽  
Niranjan Sahoo
Keyword(s):  
Wind Turbine ◽  
Computational Study ◽  
Flow Characteristics ◽  
Vertical Axis ◽  
Vertical Axis Wind Turbine ◽  
Near Wake ◽  
Flow Phenomenon ◽  
Sliding Mesh ◽  
And Performance ◽  
Accelerated Flow

Abstract In this article, a 3D computational study has been performed to understand the flow phenomenon over the vertical axis wind turbine with a three-bladed NACA0021. The rotary motion of the VAWT simulated with sliding mesh techniques with reference to the SST-Kω turbulence model using the CFD software. The observed results were found to be having a significant improvement in the enhancement of the power output. Also, the investigation was move forwarded to understand the flow characteristics of the VAWT with the presence of deflector plates in different orientation at the upstream conditions. The present of deflector plates creates an augmented flow phenomenon which creates an accelerated flow at the near wake region, causing a significant improvement in the coefficient of power of the wind turbine.

Simulation and computational study of U-mold membrane components by CFD multiphase flow Euler model

2019 ◽  
Vol 6 (7) ◽  
pp. 076432
Author(s):  
Chunqing Li ◽  
Ming Zhang ◽  
Tao Wang ◽  
Haitao Wang
Keyword(s):  
Multiphase Flow ◽  
Computational Study ◽  
Euler Model ◽  
Membrane Components

753 A Multi-scale Computational Study about Left Ventricle form and performance

2006 ◽  
Vol 2006.6 (0) ◽  
pp. 47-48
Author(s):  
Michito AKAGIRI ◽  
Hisasi TANIGUCHI ◽  
FUYOU Liang ◽  
Shinichi FUJIMOTO
Keyword(s):  
Left Ventricle ◽  
Computational Study ◽  
Multi Scale ◽  
And Performance

scholarly journals Cyber-Physical Observer for Fluidized Bed-Chemical Looping Control Applications

2017 ◽  
Author(s):  
Lawrence Shadle ◽  
David Tucker ◽  
Ronald Breault ◽  
Samuel Bayham ◽  
Justin Weber ◽  
...  
Keyword(s):  
Multiphase Flow ◽  
Fluidized Bed ◽  
Gas Flow ◽  
Flow Behavior ◽  
Chemical Looping ◽  
Flow Paths ◽  
Response Data ◽  
Flow Through ◽  
And Performance ◽  
And Control

A cyber-physical fluidized bed-chemical looping reactor (FB-CLR) is proposed to observe and control the multiphase flow behavior and improve process operations, stability, and performance. The cyber-physical observer (CPO) provides an opportunity to probe a duplicate, or mirrored, non-reacting, multiphase flow system in real-time and provide response data not available from the hot reacting system in order to control the hot unit. A control strategy was developed to share and integrate this information between to the two systems. During test operations the data from the shifting inventory of granular particles in the cold flow unit will be used to control some of the valves controlling the gas flow paths in the hot unit. Taken in conjunction with the inlet flows, temperatures, and pressures in the hot unit a control system is proposed to balance the exhaust flow through the various gas outlets of the different vessels. System identification studies are needed to characterize the process delays, time constants, and interactions between control parameters.

Sign in / Sign up

Export Citation Format

Share Document