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A method for reducing the deposition of small particles from turbulent fluid by creating a thermal gradient at the surface
Author(s) -
ElShobokshy M. S.
Publication year - 1981
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450590204
Subject(s) - laminar flow , particle deposition , turbulence , mechanics , deposition (geology) , materials science , temperature gradient , thermal , particle (ecology) , penetration (warfare) , laminar sublayer , tube (container) , particle size , velocity gradient , thermal velocity , flow velocity , flow (mathematics) , composite material , thermodynamics , reynolds number , physics , chemistry , meteorology , geology , engineering , paleontology , oceanography , operations research , sediment
The present paper suggests the use of thermophoretic phenomena to decrease the rate of particle deposition onto pipe walls from a turbulent flow. When a tube is externally heated; the particles will be subjected to thermal force within the laminar sublayer in a direction away from the surface preventing or reducing their deposition. A theory proposed by EI‐Shobokshy and Ismail (1980) has been used for estimating the deposition velocity. The thermal velocity component was calculated and the effective velocity of particles approaching the wall surface computed. The results present the relationship between particle penetration and particle size at different values of pipe wall temperature and Re. The experimental results showed a good agreement with theoretical results for particle sizes 6 ‐10 μm diameter, Re = 6000 – 8000 and pipe wall temperatures 50 – 150°C.