GENERATION OF THE KARMAN VORTEX STREET AT LOW REYNOLDS NUMBER DUE TO COOLING A CYLINDER: CAUSE AND FLUID TYPE EFFECT BY NUMERICAL COMPUTATION

The aim is to clarify a main cause and a fluid-type effect of the generation of the Karman vortex street due to cooling a cylinder at a low Reynolds number where the isothermal wake is not a Karman vortex street but the wavy wake. The two-dimensional, laminar, time-dependent continuity equation; Nav...

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Published inNumerical heat transfer. Part A, Applications Vol. 40; no. 6; pp. 659 - 688
Main Author Noto, Toshiro Miyake, Tsuyoshi Nakajima, Katsuhisa
Format Journal Article
LanguageEnglish
Published London Informa UK Ltd 09.11.2001
Taylor & Francis
Subjects
Exact sciences and technology
Fluid dynamics
Fundamental areas of phenomenology (including applications)
Jets
Physics
Rotational flow and vorticity
Separated flows
Turbulent flows, convection, and heat transfer
Wakes
Alternating direction method
Vortex shedding
Streamlines
Nusselt number
Cooling
Skin friction
Vortex street
Digital simulation
Low Reynolds number
Wakes
Circular cylinder
Alternated vortex
Vortex flow
Mesh generation
Heat transfer
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Summary:The aim is to clarify a main cause and a fluid-type effect of the generation of the Karman vortex street due to cooling a cylinder at a low Reynolds number where the isothermal wake is not a Karman vortex street but the wavy wake. The two-dimensional, laminar, time-dependent continuity equation; Navier-Stokes equations with the buoyancy term; and energy equation are solved numerically by finite difference methods in the wake from a cooled circular cylinder submerged in an upward freestream of mercury, air, or water. The main cause is clarified and is that one is the generation of the wake vorticity, which never occurs in any isothermal wake, and the other the stable arrangement with amplified asymmetry of the vorticity distribution in the wake. When the Prandtl number and / or the cylinder temperature are decreased, the Karman vortex street is generated easily and has a smaller wake frequency, smaller vortex speed, and larger vortex spiral than those in any isothermal wake. The characteristics of the Karman vortex street generated by cooling a cylinder therefore never occur in any isothermal wake.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
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ISSN:1040-7782
1521-0634
DOI:10.1080/10407780152655414