Comparative study of dry pressure drop and flow behaviour of gas flow through sieve plate packing

2020 ◽  
Vol 98 (10) ◽  
pp. 2238-2256
Author(s):  
Min Qiao ◽  
Shaobei Liu ◽  
Weixing Huang ◽  
Renjie Hao ◽  
Taoxian Zhang ◽  
...  
Keyword(s):  
Pressure Drop ◽  
Comparative Study ◽  
Gas Flow ◽  
Flow Behaviour ◽  
Sieve Plate ◽  
Flow Through

scholarly journals Two Efficient Methods for Gas Distributive Network Calculation

2018 ◽  
Author(s):  
Dejan Brkić
Keyword(s):  
Pressure Drop ◽  
Thermodynamic Properties ◽  
Gas Flow ◽  
Flow Distribution ◽  
Gas Pipeline ◽  
Gas Flow Rate ◽  
Closed Loops ◽  
Loop Method ◽  
Hardy Cross ◽  
Flow Through

Today, two very efficient methods for calculation of flow distribution per branches of a looped gas pipeline are available. Most common is improved Hardy Cross method, while the second one is so-called unified node-loop method. For gas pipeline, gas flow rate through a pipe can be determined using Colebrook equation modified by AGA (American Gas Association) for calculation of friction factor accompanied with Darcy-Weisbach equation for pressure drop and second approach is using Renouard equation adopted for gas pipeline calculation. For the development of Renouard equation for gas pipelines some additional thermodynamic properties are involved in comparisons with Colebrook and Darcy-Weisbach model. These differences will be explained. Both equations, the Colebrook’s (accompanied with Darcy-Weisbach scheme) and Renouard’s will be used for calculation of flow through the pipes of one gas pipeline with eight closed loops which are formed by pipes. Consequently four different cases will be examined because the network is calculated using improved Hardy Cross method and unified node-loop method. Some remarks on optimization in this area of engineering also will be mentioned.

Heat Transfer and Pressure Drop Through Nano-Fin Arrays in the Free-Molecular Flow Regime

2012 ◽  
Author(s):  
Michael James Martin
Keyword(s):  
Heat Transfer ◽  
Pressure Drop ◽  
Gas Flow ◽  
Ideal Gas ◽  
Molecular Flow ◽  
Ideal Gas Law ◽  
Transfer Equations ◽  
Flow Through ◽  
The One ◽  
The Ideal

Gas flow through arrays of rectangular nano-fins is modeled using the linearized free-molecular drag and heat transfer equations. These are combined with the one-dimensional equations for conservation of mass, momentum, and energy, and the ideal gas law, to find the governing equations for flow through the array. The results show that the pressure gradient, temperature, and local velocity of the gas are governed by coupled ordinary differential equations. The system of equations is solved for representative arrays of nano-fins to find the total heat transfer and pressure drop across a 1 cm chip.

Structure and Pressure Drop in Particle-Laden Gas Flow Through a Pipe Bend: A Numerical Analysis by the Euler/Lagrange Approach

2009 ◽  
Author(s):  
S. Lai´n ◽  
M. Sommerfeld
Keyword(s):  
Pressure Drop ◽  
Gas Flow ◽  
Gas Flows ◽  
Wall Roughness ◽  
Mass Loading ◽  
Particle Collisions ◽  
Pipe Bend ◽  
Flow Through ◽  
Fully Coupled ◽  
Lagrange Approach

The structure of particle-laden gas flows in a horizontal-to-vertical elbow is investigated numerically for analysing the required modelling depth. The numerical computations are performed with the fully coupled Euler-Lagrange approach considering all the relevant forces: drag, gravity-buoyancy and lift forces (slip-shear and slip-rotational). Moreover, interparticle and particle-rough wall collisions are taken into account by means of stochastic approaches. The effect of the different mechanisms, i.e. wall roughness, inter-particle collisions and mass loading, on the flow structure in the bend and the resulting pressure drop are investigated.

Measurements of Two-Phase Pressure Drop in a Simulated Debris Bed

2017 ◽  
Author(s):  
Milka Hebi Nava Rivera ◽  
Daisuke Ito ◽  
Yasushi Saito ◽  
Mitsuhiro Aoyagi ◽  
Kenji Kamiyama ◽  
...  
Keyword(s):  
Porous Media ◽  
Pressure Drop ◽  
Gas Flow ◽  
Two Phase Flow ◽  
Severe Accident ◽  
Phase Flow ◽  
Two Phase ◽  
Experimental Database ◽  
Flow Through ◽  
Measured Pressure

Two-phase flow through porous media should be well understood to develop a severe accident analysis code not only for light water reactor but also sodium cooled fast reactor (SFR). When a core disruptive accident occurs in SFR, the fuel inside the core may become melted and interacts with the coolant. As a result, gas-liquid two-phase flow will be formed in the debris bed, which may have porous nature depending on the cooling process. Thus, as first step, present work focuses on the characteristics of pressure drop in single- and two-phase flows in different porous media conditions (porous size, liquid and gas flow velocity). In addition, in order to construct an experimental database, the measured pressure drop under different conditions was compared with existing correlations.

scholarly journals Numerical Prediction of Homogeneity of Gas Flow through Perforated Plates

Processes ◽  
2021 ◽  
Vol 9 (10) ◽  
pp. 1770
Author(s):  
Kamil Śmierciew ◽  
Dariusz Butrymowicz ◽  
Jarosław Karwacki ◽  
Jerzy Gagan
Keyword(s):  
Pressure Drop ◽  
Gas Flow ◽  
Numerical Models ◽  
Perforated Plate ◽  
Total Surface Area ◽  
Structural Elements ◽  
Open Area ◽  
Perforated Plates ◽  
Porous Media Model ◽  
Flow Through

Vanes and baffles are often used as flow distributors where uniform flow is required in the apparatus of large cross-section surface areas. As an alternative, perforated plates with a range of open area ratios are applied to produce required gas flow homogeneity. Usually, the plates with various open area ratios are combined into large panels, of which total surface area can reach hundreds of square meters for large-sized industrial apparatus. Numerical modelling of the flow through such panels can be thought of as overly complex, time-consuming, and inefficient due to numerous small open area ratios in the plates and large differences in dimensions between open area ratios and free-stream areas. For this reason, numerical models of gas flow are limited to single plates only with constant open area ratios. A new indirect modelling approach of gas flow through the perforated plates panel with structural elements and various open area ratios with application of the porous media model is proposed. A perforated plate was experimentally investigated in terms of pressure drop and velocity distribution. The data obtained were used for the validation of the numerical results, which differed from the experimental results by less than 5%. In the next step, numerical analyses were performed for plates with open area ratios in the range of 30 to 70% for gas velocities of 5 and 10 m/s. A general correlation for pressure drop as a function of open area ratio was proposed. Finally, systematic numerical studies of the flow through both perforated and porous plates including structural elements were performed. The internal resistance of the porous core was calculated by means of a developed correlation. A good agreement between results with an error lower than 15% was observed.

The Study of Rarefied Gas Flow Through Microfilters With Different Openings Using MONIR-DSMC

2011 ◽  
Author(s):  
Masoud Darbandi ◽  
Abolfazl Karchani ◽  
Gerry Schneider
Keyword(s):  
Pressure Drop ◽  
Gas Flow ◽  
Rarefied Gas ◽  
Medical Applications ◽  
Rarefied Gas Flow ◽  
Rarefied Flow ◽  
Particle Pairs ◽  
Hexagonal Hole ◽  
Flow Through ◽  
Opening Factor

The main objective of this work is to evaluate the pressure loss at low subsonic rarefied flow through a microfilter having different opening shapes. As is known, a filter with a lower pressure drop is more suitable for different industrial and medical applications. We use our own developed DSMC solver, i.e., 3D MONIR-DSMC code to lunch our study. MONIR uses the NTC (no-time-counter) scheme to model the collision process. The VHS model is also chosen to simulate collision between particle pairs. The Opening factor which is known as one of the most important parameters affecting the microfilter design, is taken constant. The results show that the pressure drop for a rectangular holes is greater than the other hole shapes. Also, the hexagonal hole shapes provide efficient manners compare with circular, rectangular and cubic hole shapes, considering constant opening factor and hydraulic diameter magnitudes.

Sign in / Sign up

Export Citation Format

Share Document