Last edited by Samujora
Thursday, July 23, 2020 | History

3 edition of CFD assessment of orifice aspect ratio and mass flow ratio on jet mixing in rectangular ducts found in the catalog.

CFD assessment of orifice aspect ratio and mass flow ratio on jet mixing in rectangular ducts

CFD assessment of orifice aspect ratio and mass flow ratio on jet mixing in rectangular ducts

  • 72 Want to read
  • 15 Currently reading

Published by National Aeronautics and Space Administration, National Technical Information Service, distributor in [Washington, DC, Springfield, Va .
Written in English

    Subjects:
  • Gas-turbines -- Combustion chambers.

  • Edition Notes

    StatementD.B. Bain and C.E. Smith and J.D. Holdeman.
    SeriesNASA technical memorandum -- 106434., NASA technical memorandum -- 106434.
    ContributionsSmith, C. E., Holdeman, J. D., United States. National Aeronautics and Space Administration.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL14705486M

    by measuring the jet pressure drop across the mixing module. As a note, all ratios (momentum-flux, mass, and density) are expressed as jet flow divided by main flow. A inch long, inch diameter type K thermocouple was used to measure the temperatures. The thermocouple was held in a . performed on the data to arrive at an interpolating equation that predicted the mixing performance of orifice geometry combinations within the range of the test matrix parameters. Results indicate that the best mixing orifice geometry tested involves eight orifices with a long-to-short side aspect ratio of at a twenty-three degree inclination from the center-line of the mixing section.

      I have to calculate a multiphase flow field. My domain is entirely closed and contains 60% in volume fraction of liquid and 40% of compressible fluid (Air Ideal Gas). Domain oscillates around a stable position so calculation is unsteady calculation with a time step of about 10E   The velocity and temperature fields are presented and the rates of their decay at the jet centerline are noted. The velocity vectors of the main flow and the secondary flow are illustrated. Also, effect of aspect ratio on mixing in rectangular cross-section jets is considered. The aspect ratios that were considered for this work were to

    CFD ANALYSIS OF AN EJECTOR FOR COOLING APPLICATIONS SCOTT, D.A.(*), AIDOUN, Z. computational fluid dynamics (CFD) simulations of a vapour-jet ejector operating with Rfa as the entrainment ratio (ω) is defined as the ratio of the primary mass flow rate that comes from the . The dynamics of dilute micron-sized spherical inertial particles in turbulent duct flows is studied by means of direct numerical simulations of the carrier phase turbulence with one-way coupled Lagrangian particles. The geometries are a square and a rectangular duct with width-to-height aspect ratio AR of 3 operating at Reτ,c = (based on the centerplane friction velocity and duct half.


Share this book
You might also like
Warmed by love

Warmed by love

Zircaloy Behaviour in High Temperature Irradiated Water.

Zircaloy Behaviour in High Temperature Irradiated Water.

The New-Years gift; or A pocket almanack, for the year 1741

The New-Years gift; or A pocket almanack, for the year 1741

Scottish national standards and good practice guidance for housing information & advice services

Scottish national standards and good practice guidance for housing information & advice services

Executive agencies can do much more in using Government-owned space as an alternative to leasing or new construction

Executive agencies can do much more in using Government-owned space as an alternative to leasing or new construction

Simplifying the pensions review.

Simplifying the pensions review.

Financial audit

Financial audit

Crumbling Dreams

Crumbling Dreams

Dictionary Catalogue of the Library of the School of Library Service, Set

Dictionary Catalogue of the Library of the School of Library Service, Set

Foundations of social policy

Foundations of social policy

Appraisal of ground-water quality in the Bunker Hill Basin of San Bernardino Valley, California

Appraisal of ground-water quality in the Bunker Hill Basin of San Bernardino Valley, California

Liverpool interim planning policy.

Liverpool interim planning policy.

A scanning electron microscopy atlas of normal and malignant leukocytes

A scanning electron microscopy atlas of normal and malignant leukocytes

Also sprach Zarathustra

Also sprach Zarathustra

taxonomy of the muscoidean flies, including descriptions of new genera and species.

taxonomy of the muscoidean flies, including descriptions of new genera and species.

Murderesses in German writing, 1720-1860

Murderesses in German writing, 1720-1860

Reading and Writing for Success:FCAT Preparation for the Spanish Classroom, Grade 10 Assessment

Reading and Writing for Success:FCAT Preparation for the Spanish Classroom, Grade 10 Assessment

family and the economy in the decade of the 1980s

family and the economy in the decade of the 1980s

CFD assessment of orifice aspect ratio and mass flow ratio on jet mixing in rectangular ducts Download PDF EPUB FB2

The jet-to-mainstream mass flow ratio had a more significant effect on jet penetration and mixing. For a 4-to-1 aspect ratio orifice, the design correlating parameter for optimum mixing (C = (S/H. CFD assessment of orifice aspect ratio and mass flow ratio on jet mixing in rectangular ducts.

Bain, C. Smith and J. Holdeman; D. Bain. CFD Research Corp., Huntsville, AL. Search for more papers by this author, C. Smith. Get this from a library. CFD assessment of orifice aspect ratio and mass flow ratio on jet mixing in rectangular ducts.

[D B Bain; Clifford E Smith, (Mechanical engineer); J D Holdeman; United States. National Aeronautics and Space Administration.]. The jet-to-mainstream mass flow ratio had a more significant effect on jet penetration and mixing. For a 4–to–1 aspect ratio orifice, the design correlating parameter for optimum mixing [C = (S/H)√] varied from for a mass flow ratio of to for a mass flow ratio of The jet-to-mainstream mass flow ratio had a more significant effect on jet penetration and mixing.

For a 4-to-1 aspect ratio orifice, the design correlating parameter for optimum mixing (C = (S/H)(sq. root J)) varied from for a mass flow ratio of to for a mass flow ratio of Author: C. Smith, D. Bain and J. Holdeman. The jet-to-mainstream mass flow ratio had a more significant effect on jet penetration and mixing.

For a 4-to-1 aspect ratio orifice, the design correlating parameter for optimum mixing (C = (S/H)(sq. root J)) varied from for a mass flow ratio of to for a mass flow ratio of   The jet-to-mainstream mass flow ratio had a more significant effect on jet penetration and mixing.

For a 4-to-1 aspect ratio orifice, the design correlating parameter for optimum mixing (C = (S/H)(sq. root J)) varied from for a mass flow ratio of to for a mass flow ratio of Cited by: 6. Fluid Mixing of Opposed Jet Flows in the rectangular duct.

Takahisa Nagao, CFD mixing analysis of axially opposed rows of jets injected into confined crossflow. CFD assessment of orifice aspect ratio and mass flow ratio on jet mixing in rectangular ducts. Crossflow mixing of noncircular jets. Assessment of Orifice Aspect Ratio and Mass Flow Ratio.

on Jet Mixing in Rectangular Ducts," AIAA A CFD study of jet mixing in reduced flow areas for lower combustor emissions. (mass-flow ratio > 1 and ratio of orifice area-to-mainstream cross-sectional area up to ), and the axial. Flow Properties through a Ballistically Generated Orifice During a Hydrodynamic Ram Event.

Optimization of Orifice Geometry for Crossflow Mixing in a Cylindrical Duct. CFD assessment of orifice aspect ratio and mass flow ratio on jet mixing in rectangular ducts. It also appeared that jet penetration remained similar with variations in orifice size, shape, spacing, and momentum-flux ratio when the orifice spacing was inversely proportional to the square-root of the momentum-flux ratio.

For a jet-to-mainstream mass flow ratio (MR) ofdesign parameters were systematically varied for jet-to-mainstream momentum-flux ratios (J) between 16 and 64 and orifice spacing-to-duct. i'm trying to simulate flow in restriction orifice with this boundary condition: mass flow rate: kg/s Inlet pressure: bar outlet pressure:8 bar my problem is find size of orifice to achieve this pressure drop.

first i use total pressure as inlet boundary condition and static pressure as outlet boundary condition. the calculated mass.

CFD Mixing Analysis of Jets Injected From Straight and Slanted Slots Into a Con- fined Crossflow in Rectangular Ducts.

AI AA Paper (also NASA TM ). Bain, D. B., Smith, C. E., and Holdeman, J. CFD Assessment of Orifice Aspect Ratio and Mass Flow Ratio on Jet Mixing in Rectan- gular Ducts.

Close Drawer Menu Close Drawer Menu Menu. Home; Journals. AIAA Journal; Journal of Aerospace Information Systems; Journal of Air Transportation; Journal of Aircraft; Journal of.

Naveenji et al. () have studied variation in discharge coefficient for non-Newtonian fluid flow at beta ratios from to Oliveira et al.

() have presented numerical methodology for calibrating orifice meter. CFD technique requires reliable experimental data on flow profiles to validate its outcome. The factors that are involved in a mixing process and are also primarily responsible for the complexity are: the velocity ratio, temperature ratio, density ratio, compressibility and turbulence levels of the two streams, swirl, pressure gradient, interaction between wall bounded and free shear flows, mixing duct to inner jet nozzle diameter.

This paper reports an experimental investigation of the near-field mixing characteristics of a turbulent jet issuing from a notched-rectangular orifice plate. Planar particle image velocimetry (PIV) was used for measurements of the velocity field with the exit Reynolds number = 72, The effect of the aspect ratio of the rectangular cross section, as well as the effect of the assisted buoyancy on flow reversal and heat transfer for mixed convection with imposed flow rate in a three dimensional vertical rectangular duct is investigated numerically for various buoyancy numbers (Ω = Gr/Re) and aspect ratios (AR = L/W).

Due to. A summary of data available from the literature concerning single-phase liquid flow through micro-orifices is provided in Tableoil and refrigerants have been tested in square or circular, for the most part thick micro-orifices, i.e.

micro-orifices characterized by orifice thickness to diameter ratio t/d > In general, micro-orifice data from the literature show qualitatively.Thermal Science paper: The effects of arbitrary injection angle and flow conditions on venturi-jet mixer. Holdeman, J.D., CFD Assessment of Orifice Aspect Ratio and Mass Flow Ratio on Jet Mixing in Rectangular Ducts, AIAA(also NASA TM ), Aspect ratio.

The choice of the optimal grid cell aspect ratio is not trivial in most computational fluid flow problems. Normally, the aspect ratio is of the order of unity, but some flow types may dictate much higher or lower aspect ratios.