Head Loss in Flow Through a Cyclone Dust Separator or Vortex Chamber

1957 ◽  
Vol 24 (1) ◽  
pp. 16-21
Author(s):  
H. E. Weber ◽  
J. H. Keenan
Keyword(s):  
Experimental Data ◽  
Angular Momentum ◽  
Flow Rate ◽  
Vortex Chamber ◽  
Head Loss ◽  
The Other ◽  
Wall Friction ◽  
Exhaust Pipe ◽  
Dust Separator ◽  
Flow Through

Abstract An analysis for predicting the head loss in flow through a cyclone dust separator is presented. The effect of wall friction is indicated by consideration of two cases—one for zero wall friction, the other for wall friction great enough to eliminate the angular momentum of the stream. Comparisons of the analysis are made with the experimental data obtained from a test cyclone in which the flow rate, the depth of the inlet area, the radius of the exhaust pipe, and the extension of the exhaust pipe into the cyclone were variable. In general the agreement between the theoretical and experimental results is good. The regions of deviation between the two results are evaluated qualitatively with respect to the effects of wall friction on the head loss.

The contribution of valence quarks in the nucleon GE and GM

2019 ◽  
Vol 34 (27) ◽  
pp. 1950148
Author(s):  
Negin Sattary Nikkhoo ◽  
Mohammad Reza Shojaei
Keyword(s):  
Experimental Data ◽  
Angular Momentum ◽  
Form Factor ◽  
Total Angular Momentum ◽  
Form Factors ◽  
Distribution Functions ◽  
The Other ◽  
Parton Distribution Functions ◽  
Nucleon Electromagnetic Form Factor ◽  
Elastic Form

The goal of this paper is to extract the flavor decomposition of nucleon electromagnetic form factor using the modified Gaussian and extended Regge ansatzes in the GPDs. We consider the CJ15 and JR09 parton distribution functions for both of these ansatzes in calculating the nucleon elastic form factors. Our results are compared with experimental data in the range [Formula: see text] 4-momentum transfers. Also, we calculate the total angular momentum carried by quarks, the gravitational form factors, and the transverse gravitational density for quarks of the nucleon. In the end, our results are compared with the other studies.

scholarly journals The Computation of Adjacent Blade-Row Effects in a 1.5 Stage Axial Flow Turbine

1997 ◽  
Author(s):  
Rolf Emunds ◽  
Ian K. Jennions ◽  
Dieter Bohn ◽  
Jochen Gier
Keyword(s):  
Experimental Data ◽  
Numerical Simulation ◽  
Boundary Conditions ◽  
Axial Flow ◽  
The Other ◽  
Navier Stokes ◽  
Blade Row ◽  
Flow Through ◽  
The University

This paper deals with the numerical simulation of flow through a 1.5 stage axial flow turbine. The 3-row configuration has been experimentally investigated at the University of Aachen where measurements behind the first vane, the first stage and the full configuration were taken. These measurements allow single blade row computations, to the measured boundary conditions taken from complete engine experiments, or full multistage simulations. The results are openly available inside the framework of ERCOFTAC 1996. There are two separate but interrelated parts to the paper. Firstly, two significantly different Navier-Stokes codes are used to predict the flow around the first vane and the first rotor, both running in isolation. This is used to engender confidence in the code that is subsequently used to model the multiple bladerow tests, the other code is currently only suitable for a single blade row. Secondly, the 1.5 stage results are compared to the experimental data and promote discussion of surrounding blade row effects on multistage solutions.

Performance Evaluation of the Flow in Micro Junctions: Head Change Versus Head Loss Coefficients

2013 ◽  
Author(s):  
Bastian Schmandt ◽  
Heinz Herwig
Keyword(s):  
Energy Transfer ◽  
Mass Flow Rate ◽  
Entropy Generation ◽  
Mass Flow ◽  
Flow Rate ◽  
Head Loss ◽  
Total Head ◽  
Single Mass ◽  
Flow Through ◽  
Loss Coefficients

Losses due to the flow through conduit components in a pipe system can be characterised by head loss coefficients. They basically account for the dissipation in the flow field or, in a more general sense, for the entropy generation due to the conduit component under consideration. When only one single mass flow rate is involved, an entropy based approach is straight forward and ṁ can be used as a general reference quantity. If, however, the mass flow rate is split or united like in junctions, some new aspects appear. In our study the general approach for these kind of conduit components is discussed. Like for single mass flow rates losses are accounted for by determining the entropy generation rates. New aspects for the branched flows are an additional parameter, the splitting ratio, and the fact that there is an energy transfer between the single branches that has to be accounted for appropriately. It turns out that this energy transfer changes the total head in each flow brach in addition to a sole loss of total head. Therefore, the coefficients should be named head change coefficients when this effect occurs. As an example the flow through a T-shaped junction is considered, for which head loss coefficients are determined for both branches and discussed with respect to their physical meaning.

Losses due to the Flow Through Conduit Components in Mini- and Micro- Systems Accounted for by Head Loss/Change Coefficients

2014 ◽  
Author(s):  
Bastian Schmandt ◽  
Heinz Herwig
Keyword(s):  
Energy Transfer ◽  
Entropy Generation ◽  
Flow Rate ◽  
Head Loss ◽  
General Reference ◽  
Total Head ◽  
Flow Through ◽  
Definition Of ◽  
Micro Systems ◽  
Special Case

The definition of head loss/change coefficients should be based on the dissipation in the flow field or, in a more general sense, on the entropy generation due to a conduit component. When, in the simplest case, unbranched flow is considered, an entropy based approach is straight forward since the flow rate can be used as the general reference quantity. If, however, one mass flow rate is split or two partial flow rates are united like in junctions, a new aspect appears: There is an energy transfer between the single branches that has to be accounted for appropriately. It turns out that this energy transfer changes the total head in each flow branch in addition to the loss of total head due to entropy generation. Therefore, appropriate coefficients for junctions should be named head change coefficients. As an example, head change coefficients for dividing and combining flows due to T-shape micro-junctions are investigated and discussed with respect to their physical meaning. For combining flows, the special case of engulfment, leading to enhanced mixing in micro mixers, is considered in detail.

scholarly journals Modeling of lead (II) adsorption on sodium hydroxide treated rice husk: Fixed-bed studies

2017 ◽  
Vol 13 (4) ◽  
pp. 803-806 ◽  
Author(s):  
Abdurrahman Garba ◽  
Hatijah Basri ◽  
Noor Shawal Nasri ◽  
Umar Hayatu Siddiq ◽  
Abdul Rasheed Abdul Rahman
Keyword(s):  
Experimental Data ◽  
Aqueous Solutions ◽  
Adsorption Capacity ◽  
Rice Husk ◽  
Flow Rate ◽  
Adsorption Process ◽  
Lead Concentration ◽  
Fixed Bed ◽  
The Other ◽  
Fixed Bed Column

The treated rice husk has been evaluated as a sorbent for removing lead (II) from aqueous solutions in fixed-bed studies. In this paper, the effects of flow rate (3 and 9 mL/min), bed depth (0.9, 1.8 and 2.8 cm) and influent lead concentration of (5 and 20 mg/L) on the adsorption capacity of the adsorbent in a fixed-bed column were investigated. The highest adsorption capacity (78 %) on a 20 mg/L Pb (II) solution was achieved within a flow rate of 9 mL/min and a bed depth of 2.8 cm. The experimental data obtained from the adsorption process was correlated with the Thomas, Adams– Bohart and Yoon–Nelson models. The results of the parameters indicated Adams–Bohart model fitted well over the other models.

The Experimental Study of Residential Kitchen Gradually Expanding Oriented Structural Member Exhaust Pipe System Characteristics

2012 ◽  
Vol 610-613 ◽  
pp. 2827-2831
Author(s):  
Yue Ren Wang ◽  
Bo Song ◽  
Zhi Yang Su
Keyword(s):  
Experimental Data ◽  
Cross Section ◽  
Structural Member ◽  
The Other ◽  
Exhaust Pipe ◽  
Pipe System ◽  
Operating Rate ◽  
The Cross ◽  
System Characteristics ◽  
Better Than

The purpose of this paper is to study the residential kitchen exhaust pipe system by introducing a gradually expanding oriented structural member called GEOSM for short and analyze the experimental effects of exhaust volume. With the change of the operating rate, we can obtain the best size of the GEOSM. In order to collate and analyze the experimental data, test the experimental effects of the g GEOSM of different sizes. Not only the pressure of main and branch but also the wind speed of the branch is recorded in this paper. In six floors of 400*250 gradually expanding oriented structural member exhaust pipe system, the fan’s volume can completely meet the basic requirements of everyday life whether its volume is high-end or low-end. The effect of exhaust is obviously better than the other size of the GEOSM when the cross section width of the GEOSM is 150mm and the cross section length of the GEOSM is 250mm, the height of the GEOSM is 350mm.There arises more smoke down when the cross section width of the GEOSM is 150mm and the cross section length of the GEOSM is 300mm, the height of the GEOSM is 350mm

Computer Modeling of Flow Through Engineering Devices: Exercises for the Undergraduate Student

1991 ◽  
Author(s):  
J. J. Bazaar ◽  
J. R. Shanebrook
Keyword(s):  
Experimental Data ◽  
Theoretical Model ◽  
Engineering Students ◽  
Discharge Coefficient ◽  
Head Loss ◽  
Published Data ◽  
Undergraduate Engineering ◽  
Pipe Expansion ◽  
Flow Through ◽  
American Society

Abstract The purpose of this paper is to describe four computer exercises that have been developed for undergraduate engineering students at Union College. Each exercise involves a computer model for predicting steady, viscous flow through an engineering device. All of the analyses were performed using FLUENT, a finite-difference fluid modeling program marketed by Creare, Inc. The following cases are described in this paper: 1. The flow through a square-edged orifice was modeled and results for discharge coefficient are compared with experimental data published by the American Society of Mechanical Engineers (ASME). 2. The flow through a quadrant-edged orifice was modeled and results for discharge coefficient are compared with published data. 3. The flow through a Herschel-type Venturi meter was calculated and results for discharge coefficient are compared with ASME data. 4. The flow through a sudden pipe expansion was modeled and results for head loss are compared with a theoretical model.

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