Thermal free convection from a solid sphere |
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Authors: | A A Kranse and J Schenk |
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Institution: | (1) Laboratorium voor Technische Natuurkunde der Technische Hogeschool, Delft, Netherlands |
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Abstract: | Summary Thermal free convection from a sphere has been studied by melting solid benzene spheres in excess liquid benzene (Pr=8,3; 108<Gr<109). Overall heat transfer as well as local heat transfer were investigated. For the effect of cold liquid produced by the melting a correction has been applied. Results are compared with those obtained by other workers who used alternative experimental methods.Nomenclature
coefficient of heat transfer
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d
characteristic length, here diameter of sphere
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thermal conductivity
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g
acceleration of free fall
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cubic expansion coefficient
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T
temperature difference between wall and fluid at infinity
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kinematic viscosity
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density
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c
specific heat capacity
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a
thermal diffusivity (=/c)
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D
diffusion coefficient
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Nu
dimensionless Nusselt number (=d/)
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Nu*
the analogous number for mass transfer (=kd/D)
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mean value of Nusselt number
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Gr
dimensionless Grashof number (=gd
3T/
2)
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Gr*
the analogous number for mass transfer (=gd
3x/
2)
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Pr
dimensionless Prandtl number (=/a)
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Sc
dimensionless Schmidt number (=/D) |
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Keywords: | |
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