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Experimental results of pure and simultaneous heat and mass transfer by free convection about a vertical cylinder for Pr=0.71 and Sc=0.63

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Abstract

In this paper experimental results are given concerning stationary heat and mass transfer in the laminar boundary layer of a vertical cylinder placed in still air. The combined effect is considered as well as the two separate effects.

Measurements are carried out on heat transfer and evaporation of water. Results are in close agreement with the classical free convection boundary layer theory for a vertical flat plate, if only a small cylinder correction is applied.

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Abbreviations

A 1, A 2 :

coefficients defined in § 4

C :

empirical constant defined in § 3

D :

mass diffusivity

Gr x , Gr L :

local and mean Grashof number

Gr x,T , Gr x,c :

local heat and mass Grashof number

h :

heat of evaporation

n :

zone number

Nu x , Nu L :

local and mean Nusselt number

Pr :

Prandtl number

r 0 :

cylinder radius

S :

slope defined in § 4

Sc :

Schmidt number

Sh x , Sh L :

local and mean Sherwood number

x :

vertical coordinate along the plate

δ :

parameter defined in § 3

Δ :

height of zone

Θ 0 :

temperature difference between wall and surroundings

ϑ′(0):

dimensionless temperature gradient at the wall

λ :

thermal conductivity

ρ :

total density

φ″ x,1 :

local heat flux

φ″ x,2 :

local mass flux

φ n,1 :

heat flow in n th zone

φ n,2 :

mass flow in n th zone

φ n :

totally dissipated power in n th zone

φ r :

radiation flow

Ω 0 :

mass fraction difference between wall and surroundings

ω′(0):

dimensionless mass gradient at the wall

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Authors and Affiliations

  1. Dept. of Physics and Meteorology, Wageningen University of Agriculture, Wageningen, The Netherlands

    F. A. Bottemanne

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  1. F. A. Bottemanne
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Bottemanne, F.A. Experimental results of pure and simultaneous heat and mass transfer by free convection about a vertical cylinder for Pr=0.71 and Sc=0.63. Appl. Sci. Res. 25, 372–382 (1972). https://doi.org/10.1007/BF00382310

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  • DOI: https://doi.org/10.1007/BF00382310

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