Integrated Computational/Experimental Study of Turbulence Modification and Mixing Enhancement in Swirling Jets

Naughton, James Mc; Stănescu, Dan; Stefan, Heinz G.; Semaan, Richard; Stoellinger, Michael K.; Zemtsop, Celestin P.

doi:10.21236/ada495159

Cited by 1 publication

(1 citation statement)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Whereas the RANS RSMs are designed to include non-isotropic effects, they had mixed results in the literature [Gibson and Younis, 1986;Hogg and Leschziner, 1989;Lai, 1995;Larocque, 2004;Krishna and Ganesan, 2005;Johnson, 2006;El-Behery and Hamed, 2009;Laurien, Lavante, and Wang, 2010;Valera-Medina et al, 2010] weak to strong S, with favorable comparisons to experimental data [Kim and Menon, 1999;Kravchenko and Moin, 2000;Cziesla et al, 2001;Schluter, 2001;Apte et al, 2003;Garcia-Villalba, Frohlich, and Rodi, 2004;Wang and Bai, 2004;Moet et al, 2004;Duwig et al, 2005;Garcia-Villalba, Frohlich, and Rodi, 2005;Lu et al, 2005;Fujimoto and Yamasaki, 2006;Garcia-Villalba and Frohlich, 2006;Gyllenram, Nilsson, and Davidson, 2006;Afgan, 2007;Bonaldo, 2007;Jagus et al, 2008;Muller and Kleiser, 2008;Rodriguez and El-Genk, 2008a, b, c, and d;Denev, Frohlich, and Bockhorn, 2009;Dinesh and Kirkpatrick, 2009;El-Behery and Hamed, 2009;Iaccarino and Constantine, 2009;Naughton et al, 2009;Stein, 2009;Uddin et al, 2009;Zemtsop et al, 2009;Doolan, 2010; and b; Rodriguez and ...…”

Section: Rementioning

confidence: 77%

Swirling jets for the mitigation of hot spots and thermal stratification in the VHTR lower plenum.

Rodríguez¹

2011

View full text Add to dashboard Cite

The literature indicates that a prismatic-core very high temperature reactor can experience thermal stratification and hot spot issues in the lower plenum (LP). This research hypothesizes that the complex thermalhydraulic phenomena in the LP requires a sophisticated computational fluid dynamics (CFD) code with state-of-the-art turbulence models and advanced swirling jet technology to mitigate the two issues. The primary research goals were to increase the heat transfer and mixing capacity of swirling jets, extend swirling jet theory, and to apply those advancements for the mitigation of the thermalhydraulic issues. First, it was demonstrated that the Fuego CFD code successfully modeled a set of key LP thermalhydraulic phenomena. Thereafter, a helicoid vortex swirl model was developed to investigate the impact of the swirl number (S) on mixing and heat transfer. The development of azimuthal and axial velocities that are solely functions of S permitted the analysis of the central recirculation zone's (CRZ) impact on the LP flow field. At this point, several characteristics were found in common between the helicoid vortex and other axisymmetric, Newtonian, incompressible vortices found in the literature. This observation resulted in a more fundamental understanding of how vortices behave, and which traits can be exploited for the purpose of maximizing heat transfer and mixing. Because the CRZ is a strong function of the azimuthal and axial velocities, shaping those velocity profiles had a substantial impact. Eventually, this led to the discovery that vortices may be expressed as alternating series that expand geometrically with odd exponents. This helped corroborate that the 15 axisymmetric vortices discussed in this research are part of a vortex family with seven common traits. This also led to the development of new vortices that are based on one or two series terms that satisfy the Navier-Stokes equations and conservation of mass. In addition, the impact of Reynolds number and swirl decay were explored in order to further quantify their impact. Finally, the above theories and modeling insights were applied towards a comprehensive set of LP calculations that showed that the swirling jets mitigated the entrainment and hot spot issues, while resulting in a reasonable pressure drop. Contents

show abstract

Section: Rementioning

confidence: 77%

Swirling jets for the mitigation of hot spots and thermal stratification in the VHTR lower plenum.

Rodríguez¹

2011

View full text Add to dashboard Cite

show abstract

Integrated Computational/Experimental Study of Turbulence Modification and Mixing Enhancement in Swirling Jets

Cited by 1 publication

References 21 publications

Swirling jets for the mitigation of hot spots and thermal stratification in the VHTR lower plenum.

Swirling jets for the mitigation of hot spots and thermal stratification in the VHTR lower plenum.

Contact Info

Product

Resources

About