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Abstract For groundwater source heat pump system blocking mechanism study and development of sand blocking simulation test system，the gravel particles is used as porous media with the fly ash particles as the suspended solids. The relationship between relative concentration and pore volume of suspended particles is studied during the migration and deposition in gravel particles. The main conclusions are drawn as follows：(1) Under three different flow velocities，the migration and deposition of particles in gravel particles mainly experience three stages：increase，decrease sharply and stable stages of concentration. The overall trend is the same；and the main difference lies in different peak values of concentration. The greater the flow velocity is，the larger the peak value is；and vice versa. (2) The proposed permeability attenuation model of suspended particles is an effective tool to forecast test porosity decline caused by particles migration. (3) Through comparing theoretical analysis with test curve，it is found that tail effect did not appear in this test；and the test values are consistent with the theoretical ones.
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Received: 27 March 2013
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2014, Vol. 33 
