A swirled jet problem

Martynenko, O. G.; Korovkin, V. N.; Sokovishin, Yu. A.

doi:10.1016/0017-9310(89)90192-0

Cited by 5 publications

(9 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Loitsyanskiy [Chigier and Chervinsky, 1967;Mathur and MacCallum, 1967], as well as theoretical derivation for laminar swirling jets with free convection [Martynenko, Korovkin, and Sokovishin, 1985] and swirling jets with and without buoyant terms [Martynenko, Korovkin, and Sokovishin, 1989]. There are excellent recent reviews of vortices [Rossi, 2006].…”

Section: Swirling Jets For Mitigation Of Hot Spots and Thermal Stratifimentioning

confidence: 99%

“…Vortex research in Cartesian coordinates includes the Green-Taylor vortex [Taylor and Green, 1937] and the helicoid vortex developed in Section 5.1.1 [Rodriguez andEl-Genk, 2008a, 2010d]. Various researchers selected spherical coordinates [Tsukker, 1955;Gol'Dshtik and Yavorskii, 1986;Hwang and Chwang, 1992], but the vast majority of the research found in the literature is in cylindrical coordinates [Rankine, 1858;Lamb-Oseen, 1932;Burgers, 1948;Loitsyanskiy, 1953;Gortler, 1954;Newman, 1959;Sullivan, 1959;Batchelor, 1964;Squire, 1965;Chepura, 1969;Martynenko, 1989;Aboelkassem, Vatistas, and Esmail, 2005;Rodriguez andEl-Genk, 2008a, 2010d]. Cylindrical coordinates are chosen primarily due to its geometric simplicity and excellent mapping of the vortex behavior onto a coordinate system-in particular, as a 3D vortex spins azimuthally as it stretches about the z axis, the vortex velocity field shape fills up a cylindrical geometry.…”

Section: Vortex Modelingmentioning

confidence: 99%

“…An inspection of the literature over the past 150 years shows that the above equations are generally the departure point for generating analytic solutions for axisymmetric swirling flows (vortices) [Rankine, 1858;Lamb-Oseen, 1932;Burgers, 1948;Loitsyanskiy, 1953;Gortler, 1954;Newman, 1959;Sullivan, 1959;Batchelor, 1964;Squire, 1965;Chepura, 1969;Martynenko, 1989;Aboelkassem, Vatistas, and Esmail, 2005;Rodriguez andEl-Genk, 2008a, 2010d].…”

Section: Vortex Modelingmentioning

confidence: 99%

See 2 more Smart Citations

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: Swirling Jets For Mitigation Of Hot Spots and Thermal Stratifimentioning

confidence: 99%

Section: Vortex Modelingmentioning

confidence: 99%

Section: Vortex Modelingmentioning

confidence: 99%

See 1 more Smart Citation

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

“…Vortex research in Cartesian coordinates includes the Green-Taylor vortex (Taylor and Green, 1937) and the helicoid vortex discussed herein El-Genk, 2008a, 2010b andd). Various researchers selected spherical coordinates (Gol'Dshtik and Yavorskii, 1986;Hwang and Chwang, 1992;Tsukker, 1955), but the vast majority of the research found in the literature is in cylindrical coordinates (Aboelkassem, Vatistas, and Esmail, 2005;Batchelor, 1964;Burgers, 1948;Chepura, 1969;Gortler, 1954;Lamb, 1932;Loitsyanskiy, 1953;Martynenko, 1989;Newman, 1959;Rankine, 1858;El-Genk, 2008a, 2010b andd;Sullivan, 1959;Squire, 1965). Cylindrical coordinates are chosen primarily due to its geometric simplicity and excellent mapping of the vortex behavior onto a coordinate system-in particular, as a 3D vortex spins azimuthally, stretching about the z axis, the vortex velocity field engulfs a cylindrical geometry.…”

Section: Vortex Modelingmentioning

confidence: 99%

“…An inspection of the literature over the past 150 years shows that the above equations are generally the departure point for generating analytic solutions for axisymmetric swirling flows (vortices) (Aboelkassem, Vatistas, and Esmail, 2005;Batchelor, 1964;Burgers, 1948;Chepura, 1969;Gortler, 1954;Lamb, 1932;Loitsyanskiy, 1953;Martynenko, 1989;Newman, 1959;Rankine, 1858;Rodriguez and El-Genk, 2010b;Sullivan, 1959;Squire, 1965).…”

Section: Vortex Modelingmentioning

confidence: 99%