ISIJ International
Online ISSN : 1347-5460
Print ISSN : 0915-1559
ISSN-L : 0915-1559
Flow Phenomena and Heat Transfer around a Sphere Submerged in Water Jet and Bubbling Jet
Manabu IguchiJun-ichi TaniTomomasa UemuraZen-ichiro Morita
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1989 Volume 29 Issue 8 Pages 658-665


Velocity and turbulence around a sphere made of synthetic resin submerged in water and bubbling jets in a cylindrical vessel with bottom blowing were measured by making use of Laser Doppler Velocimeter (LDV). The melting process of an ice sphere was recorded by video camera. The local Nusselt number Nuθ of the ice sphere was determined from the initial change of the local radius. The mean Nusselt number Nu was calculated from Nuθ by numerical integration over the surface of the sphere. The effects of velocity and turbulence intensity on Nuθ and Nu were investigated. An empirical expression for Nu was proposed as a function of Reynolds number and turbulence intensity. A method of predicting the complete melting time of an ice sphere was presented.

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