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Bồi lắng pha rắn trong các phương tiện truyền thông liên tục phụ thuộc vào độ nhớt của phương tiện truyền thông, tính chất vật lý, hình thức, bề mặt gồ ghề, nồng độ của các hạt [1]. Bên cạnh đó, sức căng bề mặt cũng có tác dụng để lắng. | Science Technology Development Vol 11 No.02- 2008 INFLUENCE OF PARAFIN CONCENTRATION ON THE SEDIMENTATION OF DISPERSED PARTICLES IN THE PETROLEUM MEDIA Phan Dinh Tuan Ta Dang Khoa University of Technology VNU-HCM Manuscript Received on January26th 2006 Manuscript Revised August 29th 2007 ABSTRACT The sedimentation of solid phase in continuous media depends on the media s viscosity physical properties forms surface roughness concentration of particles 1 . Besides surface tension also has effect to the sedimentation. To include all these factors in the Stockes equation experiments on the sedimentation of sand particles in paraffin-dissolved petroleum have been done. Viscosity has been adjusted to required values by changing temperature. Paraffin amount which changes the surface tension of the media was included as an adjustment in Richardson Zaki s correlation 2 . Calculated results have been shown to be quite appropriate with the experiments. Keywords Sedimentation paraphin surface tention. 1. INTRODUCTION According to the investigation results before 1 adjusting the Stokes s equation by coefficients in Richardson and Zaki s correlation leads to a rather good adequateness with the experiments. However experiments on the sediment of sand-particles in petroleum containing parafin with different amount at constant viscosity pointed out a disagreement in sedimentation speed. Besides the base factors surface tention also has effect to the sedimentation because of the interaction between continuous media and particles. This investigation complements the referred factors into the Richardson and Zaki s correlation. 2. INVESTIGATION RESULTS 2.1. Methods Methods the equipments and standard tests are the same to the study in 1 . The study is carried out with the experimental sedimentation column. Sedimentation speed is determined also by measuring sand concentration along the column after periods of time. The continuous phase is the crude oil of the White Tiger Well adjusted .
