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Title: Experimental validation benchmark data for CFD of transient convection from forced to natural with flow reversal on a vertical flat plate

Abstract

Transient convection has been investigated experimentally for the purpose of providing Computational Fluid Dynamics (CFD) validation benchmark data. A specialized facility for validation benchmark experiments called the Rotatable Buoyancy Tunnel was used to acquire thermal and velocity measurements of flow over a smooth, vertical heated plate. The initial condition was forced convection downward with subsequent transition to mixed convection, ending with natural convection upward after a flow reversal. Data acquisition through the transient was repeated for ensemble-averaged results. With simple flow geometry, validation data were acquired at the benchmark level. All boundary conditions (BCs) were measured and their uncertainties quantified. Temperature profiles on all four walls and the inlet were measured, as well as as-built test section geometry. Inlet velocity profiles and turbulence levels were quantified using Particle Image Velocimetry. System Response Quantities (SRQs) were measured for comparison with CFD outputs and include velocity profiles, wall heat flux, and wall shear stress. Extra effort was invested in documenting and preserving the validation data. Details about the experimental facility, instrumentation, experimental procedure, materials, BCs, and SRQs are made available through this paper. As a result, the latter two are available for download and the other details are included in this work.

Authors:
 [1];  [2]
  1. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
  2. Utah State Univ., Logan, UT (United States)
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE Office of Nuclear Energy (NE)
OSTI Identifier:
1263650
Report Number(s):
SAND2016-4201J
Journal ID: ISSN 2377-2158; 644877
Grant/Contract Number:
AC04-94AL85000
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Journal of Verification, Validation and Uncertainty Quantification
Additional Journal Information:
Journal Name: Journal of Verification, Validation and Uncertainty Quantification; Journal ID: ISSN 2377-2158
Publisher:
ASME
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING

Citation Formats

Lance, Blake W., and Smith, Barton L. Experimental validation benchmark data for CFD of transient convection from forced to natural with flow reversal on a vertical flat plate. United States: N. p., 2016. Web. doi:10.1115/1.4033963.
Lance, Blake W., & Smith, Barton L. Experimental validation benchmark data for CFD of transient convection from forced to natural with flow reversal on a vertical flat plate. United States. doi:10.1115/1.4033963.
Lance, Blake W., and Smith, Barton L. Thu . "Experimental validation benchmark data for CFD of transient convection from forced to natural with flow reversal on a vertical flat plate". United States. doi:10.1115/1.4033963. https://www.osti.gov/servlets/purl/1263650.
@article{osti_1263650,
title = {Experimental validation benchmark data for CFD of transient convection from forced to natural with flow reversal on a vertical flat plate},
author = {Lance, Blake W. and Smith, Barton L.},
abstractNote = {Transient convection has been investigated experimentally for the purpose of providing Computational Fluid Dynamics (CFD) validation benchmark data. A specialized facility for validation benchmark experiments called the Rotatable Buoyancy Tunnel was used to acquire thermal and velocity measurements of flow over a smooth, vertical heated plate. The initial condition was forced convection downward with subsequent transition to mixed convection, ending with natural convection upward after a flow reversal. Data acquisition through the transient was repeated for ensemble-averaged results. With simple flow geometry, validation data were acquired at the benchmark level. All boundary conditions (BCs) were measured and their uncertainties quantified. Temperature profiles on all four walls and the inlet were measured, as well as as-built test section geometry. Inlet velocity profiles and turbulence levels were quantified using Particle Image Velocimetry. System Response Quantities (SRQs) were measured for comparison with CFD outputs and include velocity profiles, wall heat flux, and wall shear stress. Extra effort was invested in documenting and preserving the validation data. Details about the experimental facility, instrumentation, experimental procedure, materials, BCs, and SRQs are made available through this paper. As a result, the latter two are available for download and the other details are included in this work.},
doi = {10.1115/1.4033963},
journal = {Journal of Verification, Validation and Uncertainty Quantification},
number = ,
volume = ,
place = {United States},
year = {Thu Jun 23 00:00:00 EDT 2016},
month = {Thu Jun 23 00:00:00 EDT 2016}
}

Journal Article:
Free Publicly Available Full Text
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  • We present computational fluid dynamics (CFD) validation dataset for turbulent forced convection on a vertical plate. The design of the apparatus is based on recent validation literature and provides a means to simultaneously measure boundary conditions (BCs) and system response quantities (SRQs). Important inflow quantities for Reynolds-Averaged Navier-Stokes (RANS). CFD are also measured. Data are acquired at two heating conditions and cover the range 40,000 < Re x < 300,000, 357 < Re ╬┤2 < 813, and 0.02 < Gr/Re 2 < 0.232.
  • The turbulent heat transfer of combined forced and natural convection along a vertical flat plate was investigated experimentally both with aiding and opposing flows of air. Local heat-transfer coefficients were measured in the vertical direction. The results show that the local Nusselt numbers for aiding flow become smaller than those for the forced and the natural convection, while the Nusselt numbers for the opposing flow are increased significantly. These results are compared with the previous results for water. It has been found that the nondimensional parameter Z(= Gr{sub x}*/Nu{sub x}Re{sub x}){sup 2.7}Pr{sup 0.6} can predict the behavior of heat transfermore » both for air and water. Furthermore, the natural, forced, and combined convection regions can be classified in terms of the above parameter.« less
  • The mechanisms of the retardation and enhancement of heat transfer in the combined convection region of aiding and opposing flows were investigated both experimentally and analytically. The surface temperature distributions were visualized by a liquid crystal sheet. The results show that low-temperature streaks or spots of large sizes appear in the whole regions of forced, natural, and combined convections, and they exert a significant role a on the heat transfer. Such low-temperature streaks or spots are generated as a result of the penetration of low-temperature fluid lumps into the near wall regions. The surface renewal model is proposed to simulatemore » the heat transport by the above fluid motion. It is found that the model predicted the heat transfer of the combined convection quite satisfactorily.« less
  • This paper reports on an opposing flow of turbulent combined forced and natural convection along a vertical flat plate heated with a uniform heat flux that was investigated experimentally. The local heat-transfer coefficients along the vertical direction were measured at high Rayleigh and Reynolds numbers. It was found that the heat-transfer rates in the combined convection region became much larger than those for both the pure forced and pure natural convection. The natural, forced, and their combined convection regions are classified in terms of the nondimensional parameter, {zeta} = (Gr{sub x}*/Nu{sub x}Re{sub x}{sup 2.7}). These results are then compared withmore » those for aiding flow.« less