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Journal of Enhanced Heat Transfer
Factor de Impacto: 0.562 Factor de Impacto de 5 años: 0.605 SJR: 0.175 SNIP: 0.361 CiteScore™: 0.33

ISSN Imprimir: 1065-5131
ISSN En Línea: 1026-5511

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Journal of Enhanced Heat Transfer

DOI: 10.1615/JEnhHeatTransf.v3.i4.20
pages 259-272

A Study of the Deposition of Fine Particles in Compact Plate Fin Heat Exchangers

M. A. Masri
Chemical Engineering & Fuel Technology, University of Sheffield, Mappin Street, Sheffield SI 3JD, UK
K. R. Cliffe
Chemical Engineering & Fuel Technology, University of Sheffield, Mappin Street, Sheffield SI 3JD, UK

SINOPSIS

The main purpose of this study was to investigate the performance of plain fin heat exchangers (PFHE) under particulate fouling for a wider application potential. A simulated PFHE was subjected to accelerated fouling tests with aluminium oxide (6 μm) and ferric oxide (3 μm) particles suspended in water. Both plain fin and wavy fin corrugations were used. Experimental tests were performed under non-heating (30°C) and heating (105°C) conditions. In all tests, the deposition/time curves showed an asymptotic behaviour. Deposition rates were higher under heated conditions. Under isothermal conditions, the deposition appeared to be governed by mass transfer from the bulk suspension to the wall surfaces and the particle deposition was mainly due to the effect of Brownian diffusion. The theoretical predictions of mass transfer coefficients from a convective mass transfer correlation were in general in reasonable agreement with the mass transfer coefficients obtained from experimental data. The effect of surface temperature was to increase the bulk temperature, therefore the diffusivity of the depositing species. Increasing the bulk temperature from 8°C to 60°C also increased the deposition rate. The wavy fin heat exchanger showed higher deposit weights compared with the plain fin and the pressure drop was also higher. Increasing the fluid flow velocity (Re up to 2500), increased the deposit weight onto the plain fin geometry. For the wavy fin geometry, beyond Re > 1500, the deposit weight started to decrease.


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