scholarly journals Discussion: “Head Loss in Flow Through a Cyclone Dust Separator or Vortex Chamber” (Weber, H. E., and Keenan, J. H., 1957, ASME J. Appl. Mech., 24, pp. 16–21)

1957 ◽  
Vol 24 (4) ◽  
pp. 642-643
Author(s):  
J. Le Conte Smith
Keyword(s):  
Vortex Chamber ◽  
Head Loss ◽  
Dust Separator ◽  
Flow Through

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.

Head loss through porous dikes

1988 ◽  
Vol 15 (5) ◽  
pp. 766-775
Author(s):  
Subhash C. Jain ◽  
Forrest M. , Jr. ◽  
Tim H. Lee
Keyword(s):  
Reynolds Number ◽  
Porous Media ◽  
Material Properties ◽  
Power Plants ◽  
Heat Dissipation ◽  
Cooling Water ◽  
Head Loss ◽  
Scale Model ◽  
Flow Through ◽  
Full Scale Tests

Porous dikes have been proposed for use in blocking access of fish to cooling water intakes in power plants using large cooling ponds for heat dissipation. Flow through such dikes is neither of the Darcy type nor quadratic, the friction factor depending on both the Reynolds number and material properties. Full-scale tests of the dike material proposed for the LaSalle County power plant confirmed the material-property and Reynolds-number dependencies reported in the literature and permitted calibration of the head-loss parameters for the prototype material under two placement configurations. Limited tests on dike clogging by surface debris permitted quantification of the additional head loss which clogging could cause. Key words: porous media, cooling ponds, dikes, scale model tests.

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.

Oxygen Transport in Salmon Spawning Gravels

1980 ◽  
Vol 37 (2) ◽  
pp. 155-162 ◽  
Author(s):  
R. A. Johnson
Keyword(s):  
Oxygen Transport ◽  
Flow Resistance ◽  
Head Loss ◽  
Flow Through Porous Media ◽  
Air Entrapment ◽  
Flow Rates ◽  
Pressure Drops ◽  
Salmon Eggs ◽  
Flow Through ◽  
Media Data

The importance of understanding transport characteristics of flow through gravel media is discussed from the viewpoint of salmonid enhancement programs. A summary of the important features of the incubation process with respect to mass transport is provided along with applicable theories describing flow through porous media. Data obtained from experiments described herein are used to assess the accuracy of existing correlations for predicting pressure drops across gravel substrates. It is found that available hydraulic relations can be used to predict flow velocity magnitudes in gravel media with an accuracy of ± 50% over a twofold range of flow rates, providing one measurement of head loss is available at one flow rate. An adaptation of the Carman–Kozeny equation is found to be suitable for calculating the influence of fines on permeability. The importance of air entrapment on flow resistance is confirmed experimentally and modeled using available correlations. Lastly, the applications of these results for calculating oxygen transport to incubating salmon eggs and minimum water flows in hatcheries are discussed.Key words: Salmon enhancement, oxygen transport, permeability, gravel, incubation, hatcheries

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 Simulasi Model Aliran Fluida Dan Kebutuhan Daya Pompa Pada Sistem Hidrodinamika

2016 ◽  
Vol 9 (1) ◽  
pp. 40-49
Author(s):  
Syahrul Syahrul ◽  
Siti Mechram ◽  
Purwana Satrio ◽  
Agus A. Munawar
Keyword(s):  
Flow Characteristic ◽  
Reynold Number ◽  
Visual Basic ◽  
Head Loss ◽  
Simulation Program ◽  
Power Requirement ◽  
Hydrodynamic Simulation ◽  
Modeling Simulation ◽  
Hydrodynamic System ◽  
Flow Through

Abstrak. Sistem hidrodinamika merupakan suatu kesatuan sistem dimana di dalamnya terdapat air yang mengalir dari suatu tempat ke tempat lain dimana tempat tersebut bisa berupa tangki, bak atau tempat penampungan lain. Sistem ini banyak diterapkan di bendungan, saluran-saluran irigasi, industri air minum dan bahkan industri-industri pengolahan pangan dan hasil pertanian. Para ilmuwan dan insinyur mempelajari sistem ini untuk menganalisa perubahan energi yang terjadi di sepanjang pipa akibat friksi di sepanjang pipa, katup, belokan, keran, dan perubahan diameter pipa. Tujuan utama dari studi ini adalah untuk membangun sistem model simulasi dalam program Visual Basic yang dapat digunakan untuk menganalisa karakteristik fluida dan menghitung kebutuhan daya pompa yang optimum pada sistem. Hasil studi menunjukkan bahwa sistem yang dibangun dapat menganalisa sistem hidrodinamika dengan cepat dan akurasi simulasi mencapai 0.99, 1 dan 0.99 untuk analisa bilangan Reynold, head loss, dan daya pompa yang diperlukan sistem.  Modeling Simulation To Determine Fluids Flow And Power Requirement In Hydrodynamic System Abstract. Hydrodynamic system is a whole system where the water as the fluid is flow through pipe from a reservoir to another. This system can be find in an irrigation channels, water supply industries and even though in food processing industries. Scientist and engineers were analyze this system especially in head loss which caused by the friction in pipes, valves, elbows, joints and change of pipe areas. The objective of this study is to build a simulation program in microsoft visual basic which can be use to analyze and compute fluids flow characteristic and the required power pump. The result shows that hydrodynamic simulation program can analyze the system fastly and from the regression analyzes were given a high values for coefficient of correlation (r) whereas 0.9995 for reynold number prediction, 1 and 0.9972 both for system head loss and power requirement prediction respectively.

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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