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Research Papers

Experimental Validation Benchmark Data for Computational Fluid Dynamics of Mixed Convection on a Vertical Flat Plate

[+] Author and Article Information
Blake W. Lance

Advanced Nuclear Concepts,
Sandia National Laboratories,
Albuquerque, NM 87185
e-mail: blance@sandia.gov

Jeff R. Harris

Applied Research Laboratory,
The Pennsylvania State University,
State College, PA 16802
e-mail: jeff.harris@psu.edu

Barton L. Smith

Professor
Fellow ASME
Mechanical and Aerospace Engineering,
Utah State University,
Logan, UT 84322
e-mail: barton.smith@usu.edu

Manuscript received September 23, 2015; final manuscript received December 28, 2015; published online April 19, 2016. Assoc. Editor: Hugh W. Coleman.

J. Verif. Valid. Uncert 1(2), 021005 (Apr 19, 2016) (13 pages) Paper No: VVUQ-15-1043; doi: 10.1115/1.4032499 History: Received September 23, 2015; Revised December 28, 2015

Model validation for computational fluid dynamics (CFD), where experimental data and model outputs are compared, is a key tool for assessing model uncertainty. In this work, mixed convection was studied experimentally for the purpose of providing validation data for CFD models with a high level of completeness. Experiments were performed in a facility built specifically for validation with a vertical, flat, heated wall. Data were acquired for both buoyancy-aided and buoyancy-opposed turbulent flows. Measured boundary conditions (BCs) include as-built geometry, inflow mean and fluctuating velocity profiles, and inflow and wall temperatures. Additionally, room air temperature, pressure, and relative humidity were measured to provide fluid properties. Measured system responses inside the flow domain include mean and fluctuating velocity profiles, temperature profiles, wall heat flux, and wall shear stress. All of these data are described in detail and provided in tabulated format.

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References

Figures

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Fig. 1

The Validation Hierarchy, after Ref. [6]

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Fig. 2

SRQ difficulty spectrum, after Ref. [3]. The variables y and x here are arbitrary.

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Fig. 3

RoBuT flow components in the buoyancy-aided orientation

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Fig. 4

Heated wall cross section with component names as in Table 3. The relative thicknesses are to scale.

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Fig. 5

Particle images at x2: (a) buoyancy-aided with heated wall at left and (b) buoyancy-opposed with heated wall at right

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Fig. 6

TC probe with its reflection in the heated wall on the right

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Fig. 7

Measured temperatures on the test section boundaries

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Fig. 8

Measured streamwise velocity u¯ at the inlet for the buoyancy-opposed case

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Fig. 10

Normalized streamwise mean velocity u¯ and Reynolds normal stress u′u′¯ at three locations in x for the buoyancy-opposed case

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Fig. 9

Normalized streamwise mean velocity u¯ and Reynolds normal stress u′u′¯ at three locations in x for the buoyancy-aided case

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Fig. 11

Measured streamwise mean velocity u¯ with buoyancy-aided (Aid) and buoyancy-opposed (Opp) at three locations in x

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Fig. 12

Measured streamwise Reynolds normal stress u′u′¯ with buoyancy-aided (Aid) and buoyancy-opposed (Opp) at three locations in x

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Fig. 13

Measured temperature profiles for all three x locations for the buoyancy-opposed case

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Fig. 14

Measured temperature profiles near the heated wall with line fit for all three x locations for the buoyancy-opposed case. Note the unique wall temperature values Ts as the wall is nearly isothermal. Ts at x1 is about 2 °C cooler than the other two.

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Fig. 15

Measured wall heat flux plotted along streamwise direction x with correlations for mixed convection for the bouyancy-aided (Aid), buoyancy-opposed (Opp), and their difference (Opp-Aid). HFS results are labeled as HFS and correlation results as Corr.

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Fig. 16

Streamwise mean velocity u¯ near the heated wall with linear fit for shear stress measurement of the buoyancy-opposed case

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Fig. 17

Mean streamwise velocity u¯ with several repeats at three locations in x for the aided case

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Fig. 18

Mean streamwise velocity u¯ with several repeats at three locations in x for the opposed case

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Fig. 19

Measured mean streamwise Reynolds stress u′u′¯ with several repeats at three locations in x for the aided case

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Fig. 20

Measured mean streamwise Reynolds stress u′u′¯ with several repeats at three locations in x for the opposed case

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Fig. 21

Scatter of instantaneous u′ and v′ at the y-location of largest u′u′¯ for the aided case at x2 showing tight grouping

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Fig. 22

Scatter of instantaneous u′ and v′ at the y-location of largest u′u′¯ for the opposed case at x2 showing larger scatter

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