Chacko, Salvio, Chung, Yongmann M., Choi, S. K., Nam, H. Y. and Jeong, H. Y.. (2011) Large-eddy simulation of thermal striping in unsteady non-isothermal triple jet. International Journal of Heat and Mass Transfer, Vol.54 (No.19-20). pp. 4400-4409. ISSN 00179310

Preview

PDF WRAP_Chung_0070335-es-201011-les_final_27may2011.pdf - Submitted Version - Requires a PDF viewer such as GSview, Xpdf or Adobe Acrobat Reader Download (1976Kb)

Abstract

Unsteady temperature fluctuations of non-isothermal turbulent jets are encountered in many engineering applications including liquid metal cooled fast reactors (LMFR), and can cause thermal stresses on solid boundaries. An accurate prediction of the temperature fluctuations is important to assess potential thermal fatigue damage to components, and traditionally this has been done by RANS turbulence modelling calculations with limited success. In this study, a large eddy simulation (LES) technique was applied to predict the temperature fluctuations of thermal striping observed in a triple jet. The triple jet model was used as a mock-up of the outlet of fuel subassemblies in a nuclear fast reactor. The results show that LES predicted the highly oscillatory nature of unsteady thermal mixing of the triple jet. The LES results were in good agreement with the available experimental data in terms of mean, RMS, skewness and kurtosis. The large amplitude of the temperature fluctuations associated with the thermal striping was captured correctly, demonstrating that LES can be used to analyse unsteady characteristics of thermal striping. Instantaneous and time mean thermal fields were further analysed to assess the capability and accuracy of LES in the thermal striping study. The Spalart–Allmaras and realisable k − ε turbulence models were also considered along with LES. It is found that these turbulence models produced a very small amplitude of fluctuations, and failed to predict the correct magnitude of unsteady thermal fluctuations, highlighting the limitations of the RANS approach in unsteady heat transfer simulations.

Item Type:	Journal Article
Subjects:	T Technology > TA Engineering (General). Civil engineering (General)
Divisions:	Faculty of Science > Engineering Faculty of Science > Centre for Scientific Computing
Library of Congress Subject Headings (LCSH):	Jets, Thermal stresses
Journal or Publication Title:	International Journal of Heat and Mass Transfer
Publisher:	Pergamon
ISSN:	00179310
Date:	September 2011
Volume:	Vol.54
Number:	No.19-20
Page Range:	pp. 4400-4409
Identification Number:	10.1016/j.ijheatmasstransfer.2011.05.002
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
Funder:	Engineering and Physical Sciences Research Council (EPSRC), Korea (South). Kyoyuk Kwahak Kisulbu
Grant number:	EP/G069581/1 (EPSRC)
References:	[1] P. Chellapandi, S. C. Chetal, and B. Raj. Thermal striping limits for components of sodium cooled fast spectrum reactors. Nuclear Engineering and Design, 239:2754{ 2765, 2009. [2] M. Wakamatsu, H. Nei, and K. Hashiguchi. Attenuation of temperature fluctuations in thermal striping. Journal of Nuclear Science and Technology, 32(8):752{762, 1995. [3] D. Tenchine and H. Y. Nam. Thermal hydraulics of co-axial sodium jets. AIChE Symp. Ser., 83(257):151{156, 1987. [4] J. P. Moro and D. Tenchine. Mixing of coaxial jets: Comparison of sodium and air experiments. In IAEA International Working Group on Fast Reactors, Specialist Meeting on Correlation Between Material Properties and Thermo-Hydraulics Con- ditions in LMFBRs, pages 1/16{6/16, 1994. [5] D. Tenchine and J. P. Moro. Experimental and computational study of turbulent mixing jets for nuclear reactors applications. ISTP-12, 16-20 July, Istanbul, Turkey, 2000. [6] D. Tenchine. Some thermal hydraulic challenges in sodium cooled fast reactors. Nuclear Engineering and Design, 240:1195{1217, 2010. [7] A. Tokuhiro and N. Kimura. An experimental investigation on thermal striping: Mixing phenomena of a vertical non-buoyant jet with two adjacent buoyant jets as measured by ultrasound doppler velocimetry. Nuclear Engineering and Design, 188(1):49{73, 1999. [8] N. Kimura, M. Nishimura, and H. Kamide. Study on convective mixing for thermal striping phenomena (Experimental analyses on mixing process in parallel triple-jet and comparisons between numerical methods). JSME International Journal Series B, 45(3):592{599, 2002. [9] N. Kimura, H. Miyakoshi, and H. Kamide. Experimental investigation on transfer characteristics of temperature fluctuation from liquid sodium to wall in parallel triple-jet. International Journal of Heat and Mass Transfer, 50(9-10):2024{2036, 2007. [10] H. Y. Nam and J. M. Kim. Thermal striping experimental data. Internal report, LMR/IOC-ST-002-04-Rev.0/04, KAERI, 2004. [11] S. Ushijima, N. Tanaka, and S. Moriya. Turbulence measurements and calculation of non-isothermal coaxial jets. Nuclear Engineering and Design, 122(1-3):85{94, 1990. [12] M. Nishimura, A. Tokuhiro, N. Kimura, and H. Kamide. Numerical study on mixing of oscillating quasi-planar jets with low Reynolds number turbulent stress and heat flux equation models. Nuclear Engineering and Design, 202(1):77{95, 2000. [13] M. Nishimura and N. Kimura. URANS computations for an oscillatory nonisothermal triple-jet using the k - E and second moment closure turbulence models. International Jounal for Numerical Methods in Fluids, 43(9):1019{1044, 2003. [14] S.-K. Choi, H. Y. Nam, M. H. Wi, S.-O. Kim, J. C. Jo, and H. K. Choi. Evaluation of turbulence models for thermal striping in a triple-jet. In Proceedings of the ASME Pressure Vessels and Piping Conference, volume 4, pages 867{873, 2005. [15] S.-K. Choi and S.-O. Kim. Evaluation of turbulence models for thermal striping in a triple jet. ASME: Journal of Pressure Vessel Technology, 129(4):583{592, 2007. [16] A. Manera, H.-M. Prassera, R. Lechner, and T. Frank. Toward the prediction of temperature fluctuations by means of steady RANS for the estimation of thermal fatigue. In 13th International Topical Meeting on Nuclear Reactor Thermal Hydraulics (NURETH-13), 27 September-2 October, Kanazawa City, Ishikawa, Japan, 2009. [17] G. Medic and P. A. Durbin. Toward improved prediction of heat transfer on turbine blades. ASME: Journal of Turbomachinery, 124:187{192, 2002. [18] F. R. Menter. Two equation eddy-viscosity turbulence models for engineering applications. AIAA Journal, 32:1598{1604, 1994. [19] G. Grotzbach and M. Worner. Direct numerical and large eddy simulations in nuclear applications. International Journal of Heat and Fluid Flow, 20(3):222{240, 1999. [20] J.-P. Simoneau, J. Champigny, and O. Gelineau. Applications of large eddy simulations in nuclear field. Nuclear Engineering and Design, 240:429{439, 2010. [21] Fluent. version 6.3.26, documentation. [22] P. R. Spalart and S. R. Allmaras. A one-equation turbulence model for aerodynamic flows. In 30th AIAA Aerospace Sciences Meeting and Exhibit, Reno, NV, USA, AIAA Paper 92-0439, 1992. [23] T.-H. Shih, W. W. Liou, A. Shabbir, Z. Yang, and J. Zhu. A new k - E eddyviscosity model for high Reynolds number turbulent flows - Model development and validation. Computers and Fluids, 24(3):227{238, 1995. [24] R. I. Issa. Solution of the implicitly discretised fluid flow equations by operatorsplitting. Journal of Computational Physics, 62:40{65, 1986. [25] Ansys. ICEM CFD Hexa 12.0, documentation. [26] H. C. Chen and V. C. Patel. Near-wall turbulence models for complex flows including separation. AIAA Journal, 26:641{648, 1988. [27] P. Catalano, M. Wang, G. Iaccarino, and P. Moin. Numerical simulation of the flow around a circular cylinder at high reynolds numbers. International Journal of Heat and Fluid Flow, 24:463{469, 2003.
URI:	http://wrap.warwick.ac.uk/id/eprint/37122

Data sourced from Thomson Reuters' Web of Knowledge

Request changes to a record

Actions (login required)

View Item