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Published: Kem. Ind. 57 (7-8) (2008) 363–369
Paper reference number: KUI-32/2007
Paper type: Review
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Wall Sampling of Suspensions from Liquid-solid Systems

N. Kuzmanić, E. Mitrović Kessler+ and R. Stipišić


The problem of an adequate sampling from slurry handling equipment is present in many branches of the chemical and related industries. It is often very important to know the solid concentration and the particle size distribution in the apparatus of this kind, in order to control and operate them. For this purpose, wall sampling is widely adopted in industrial practice for its simplicity and versatility. Serious errors in measuring solids concentration can arise from unsuitable sampling. This work reports the main factors that may cause these deviations from ideal wall sampling during work with slurry handling equipment. Up to now, some authors have thoroughly studied the problem of isokinetic and anisokinetic sampling from slurry pipelines, both theoretically and experimentally. However, little work was dedicated to the withdrawal of solid suspensions from stirred vessels. The main sources of sampling errors occur because of particle inertia, particle bouncing effects and flow structure ahead of the sampling device. The results of experimental work of different authors indicate that the solid concentration in the sample, i. e. sampling efficiency, depends strongly on the sample tube design, withdrawal velocity and sampling device location as well.

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suspension, wall sampling, sampling probe, withdrawal velocity, sampling efficiency, isokinetic sampling