Jet stability and wall impingement flow field in a thermal striping experiment

Lomperski, S.; Obabko, A.; Merzari, E.; Fischer, P.; Pointer, W. D.

doi:10.1016/j.ijheatmasstransfer.2017.07.076

Title: Jet stability and wall impingement flow field in a thermal striping experiment

Full Record
Other Related Research

Abstract

We present velocity and temperature field measurements for a 0.9 × 0.9 × 1.7 m glass tank in which two air jets mix and impinge upon the lid at ambient temperature and pressure. At jet Re ≈ 10,000, flow patterns below the lid were characterized for two inlet geometries: (1) “extended”, in which inlet channels protrude above the tank base, and (2) “flush”, a flat base without protrusions. This minor geometry variation produced distinct changes in the lid velocity field, appearing as three stagnant regions for the extended case and only one for flush. The dichotomy is attributed to system stability characteristics: jets are stable in the extended case and unstable for flush. In a separate set of nonisothermal tests, the impingement temperature field was measured for inlet temperature mismatches of 4 °C with jets again near Re = 10,000. A 50 m-long fiber optic distributed temperature sensor beneath the lid measured at 1350 locations. Like the velocity fields, the temperature fields differ for the two inlet geometries: good thermal mixing for the flush case and subdued mixing for the extended case. Simulations with the spectral element code Nek5000 replicated the observed stability dichotomy, duplicating the number of stagnant regionsmore »« less

Authors:

Lomperski, S. ^[1]; Obabko, A. ^[1]; Merzari, E. ^[1]; Fischer, P. ^[1]; Pointer, W. D. ^[2]

Argonne National Lab. (ANL), Argonne, IL (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Publication Date:: Thu Aug 10 00:00:00 EDT 2017

Research Org.:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Argonne National Lab. (ANL), Argonne, IL (United States)

Sponsoring Org.:: USDOE Office of Nuclear Energy, Nuclear Energy Advanced Modeling and Simulation (NEAMS); USDOE Office of Nuclear Energy (NE)

OSTI Identifier:: 1376554

Alternate Identifier(s):: OSTI ID: 1379164; OSTI ID: 1549870

Grant/Contract Number:: AC05-00OR22725; AC02-06CH11357

Resource Type:: Accepted Manuscript

Journal Name:: International Journal of Heat and Mass Transfer

Additional Journal Information:: Journal Volume: 115; Journal Issue: Part A; Journal ID: ISSN 0017-9310

Publisher:: Elsevier

Country of Publication:: United States

Language:: English

Subject:: 42 ENGINEERING; CFD validation; experiment; thermal striping; Nek5000; PIV; fiber optic distributed temperature sensor; jet impingement; CFD Validation; NeK5000

Citation Formats


                    Lomperski, S., Obabko, A., Merzari, E., Fischer, P., and Pointer, W. D. Jet stability and wall impingement flow field in a thermal striping experiment.  United States: N. p., 2017. 
Web.  doi:10.1016/j.ijheatmasstransfer.2017.07.076.

Copy to clipboard


                    Lomperski, S., Obabko, A., Merzari, E., Fischer, P., & Pointer, W. D. Jet stability and wall impingement flow field in a thermal striping experiment.  United States.  https://doi.org/10.1016/j.ijheatmasstransfer.2017.07.076

Copy to clipboard


                    Lomperski, S., Obabko, A., Merzari, E., Fischer, P., and Pointer, W. D. Thu .  
"Jet stability and wall impingement flow field in a thermal striping experiment".  United States.  https://doi.org/10.1016/j.ijheatmasstransfer.2017.07.076.  https://www.osti.gov/servlets/purl/1376554.

Copy to clipboard


                    
@article{osti_1376554,

  title        = {Jet stability and wall impingement flow field in a thermal striping experiment},

  author       = {Lomperski, S. and Obabko, A. and Merzari, E. and Fischer, P. and Pointer, W. D.},

  abstractNote = {We present velocity and temperature field measurements for a 0.9 × 0.9 × 1.7 m glass tank in which two air jets mix and impinge upon the lid at ambient temperature and pressure. At jet Re ≈ 10,000, flow patterns below the lid were characterized for two inlet geometries: (1) “extended”, in which inlet channels protrude above the tank base, and (2) “flush”, a flat base without protrusions. This minor geometry variation produced distinct changes in the lid velocity field, appearing as three stagnant regions for the extended case and only one for flush. The dichotomy is attributed to system stability characteristics: jets are stable in the extended case and unstable for flush. In a separate set of nonisothermal tests, the impingement temperature field was measured for inlet temperature mismatches of 4 °C with jets again near Re = 10,000. A 50 m-long fiber optic distributed temperature sensor beneath the lid measured at 1350 locations. Like the velocity fields, the temperature fields differ for the two inlet geometries: good thermal mixing for the flush case and subdued mixing for the extended case. Simulations with the spectral element code Nek5000 replicated the observed stability dichotomy, duplicating the number of stagnant regions observed in the experiment and matching their locations within ±10 mm. Simulation data suggests that flush case instability is due to interactions between jets and wall flows at the bottom of the tank. The clear flow dichotomy exhibited by this two-jet setup presents an unambiguous case to test the ability of CFD tools to predict subtle flow field changes driven by minor modifications in geometry in the context of thermal striping},

  doi          = {10.1016/j.ijheatmasstransfer.2017.07.076},

  journal      = {International Journal of Heat and Mass Transfer},

  number       = Part A,

  volume       = 115,

  place        = {United States},

  year         = {Thu Aug 10 00:00:00 EDT 2017},

  month        = {Thu Aug 10 00:00:00 EDT 2017}

}

Copy to clipboard

Journal Article:

Free Publicly Available Full Text

Accepted Manuscript (Publisher)

Accepted Manuscript (DOE)

Publisher's Version of Record

https://doi.org/10.1016/j.ijheatmasstransfer.2017.07.076

Other availability

Search WorldCat to find libraries that may hold this journal

Citation Metrics:

Cited by: 7 works

Citation information provided by
Web of Science

Save / Share:

Export Metadata

Save to My Library

Similar Records in DOE PAGES and OSTI.GOV collections:

High-resolution time-resolved experiments on mixing and entrainment of buoyant jets in stratified environments

Technical Report Manera, Annalisa ; Bardet, Philippe ; Petrov, Victor

Fluid jets interacting with a stratified layer play an important role in the safety of several reactor designs. In the containment of nuclear power plants, fluid jets dominate the transport and mixing of gaseous species and consequent hydrogen distribution in case of a severe accident. The mixing phenomena in the containment are driven by buoyant high-momentum injections (jets) and low momentum injection plumes. Mixing near the postulated break is initially dominated by high flow velocities. Plumes with moderate flow velocities are instead relevant in the break compartment during the long-term pressurization phase, or in any of the apertures between twomore »« less
https://doi.org/10.2172/1437156

Full Text Available
Turbulent single-phase and two-phase semi-confined jet impingement heat transfer predictions

Conference Wheeler, J P ; Neti, S

Turbulent single-phase, and two-phase (air and water droplets) jet impingement cases are calculated and analyzed for a variety of configurations and input and boundary conditions including jet Reynolds number (Re{sub w}), non-dimensional distance to target wall (H/W), inlet turbulence intensity, droplet size and injection velocity, and loading ratio. A finite control volume method is used with a two-layer turbulence model for solving the continuous phase flow parameters, and a trajectory approach is used to make two-phase flow calculations. For the single-phase cases examined, a secondary rise in Nusselt number was seen for higher H/W values or larger Reynolds numbers. Thismore »« less
Max Data Report Jet Stability versus Inlet Geometry

Technical Report Lomperski, S. ; Bremer, N.

This document describes experiments investigating the effect of inlet geometry on the flow field within a glass tank where two jets mix and impinge upon the lid. The setup mimics the outlet plenum of a fast reactor where core exit flows of different temperatures can mix in ways that induce thermal cycling in neighboring structures.
https://doi.org/10.2172/1224958

Full Text Available
A direct numerical simulation study for confined non-isothermal jet impingement at moderate nozzle-to-plate distances: Capturing jet-to-ambient density effects

Journal Article Domino, Stefan P. ; Wenzel, Everett A. - International Journal of Heat and Mass Transfer

A direct numerical simulation (DNS) campaign is deployed for a series of confined downward oriented, non-isothermal turbulent impinging jet configurations. A baseline Reynolds number of 9960 is obtained through a precursor DNS pipe flow simulation (Re_τ = 505). Three jet temperature configurations (confinement height to nozzle diameter of three) enter a cylindrical domain that share ambient and impingement plate temperatures (298.15 K). The range of jet temperatures are crafted such that the ratio of inlet to ambient density varies from unity to 0.52, showcasing the effect of density disparity on flow characteristics such as core collapse, radial mixing of momentummore »« less
https://doi.org/10.1016/j.ijheatmasstransfer.2023.124168

Full Text Available
Heat transfer for a semi-confined impinging laminar jet

Conference Wheeler, J P ; Neti, S

Jets are used for a multitude of applications such as annealing, drying, and cooling. Here, heat transfer and fluid flow aspects of a steady-state two-dimensional impinging semi-confined laminar jet are numerically analyzed for various conditions using a finite control volume method. Jet Reynolds numbers in the range {le} Re{sub w} {le} 500 are considered for non-dimensional distances from jet inlet to target plate, H/W, of 1 to 4. The effect of changing thermal boundary conditions is examined. A self-adjusting noding scheme was developed and used to increase resolution in regions where thermal conditions were changing rapidly in the direction ofmore »« less

Similar Records