| Characterizations of PSD Fractal of Porous Medium |
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| 作者姓名： | 黄国强 徐世民 李鑫钢 |
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| 作者单位： | School of Chemical Engineering and Technology，National Engineering Research Center for Distillation Technology，School of Chemical Engineering and Technology Tianjin University，Tianjin 300072，China，National Engineering Research Center for Distillation Technology，Tianjin University，Tianjin 300072，China，Tianjin University，Tianjin 300072，China，Tianjin University，Tianjin 300072，China，National Engineering Research Center for Distillation Technology，Tianjin University，Tianjin 300072，China |
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| 基金项目： | SupportedbyNationalNaturalScienceFoundationofChina(No .2 0 2 760 4 8) |
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| 摘 要： | Fractalisatermusedtodescribegeometricalobjectsthatareinvariantuponthechangeoflengthscale .Manyfrac talcharactersofscaleinvarianceonporousmediumshavebeeninvestigatedduringthepastdecades1] .Particle sizedistribution (PSD)isafundamentalpropertyofporousmedi ums.PSDofporousmediumsiscommonlyreportedintermsofthepercentagesofvariousparticle sizeintervalsandhasusuallybeenfoundtoobeypowerscalingofthetype2 ] N(≥d)∝d-Dp (1)whereN(≥d)isthenumberofparticlediameterlargerthanorequaltod ,andthepow…
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Characterizations of PSD Fractal of Porous Medium |
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| HUANG Guo-qiang ,XU Shi-min ,LI Xin-gang.Characterizations of PSD Fractal of Porous Medium[J].Transactions of Tianjin University,2003,9(3). |
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| Authors: | HUANG Guo-qiang XU Shi-min LI Xin-gang |
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| Institution: | 1. School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China;National Engineering Research Center for Distillation Technology, Tianjin University, Tianjin 300072, China
2. National Engineering Research Center for Distillation Technology, Tianjin University, Tianjin 300072, China |
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| Abstract: | A volume-based method for measuring particle-size distribution (PSD) fractal dimensions of porous mediums was developed by employing laser size-analyzing technology. Compared with conventional approaches of using hydrometer or screen to determine PSD, this method can avoid calculation errors and measure smaller size-scale porous medium. In this paper the experimental porous mediums were brown soil, kaolin and sand soil. A micro-order of magnitude (10 -5 m) in particle-size interval could be shown in PSD results of brown soil and kaolin. The experiments indicated that brown soil had a nearly mono-fractal PSD character, while kaolin and sand soil showed multi-fractal PSD characters. By the adsorption isotherm experiments, the PSD fractal dimensions of the sand soil were also found to keep a linearly increasing relation with the linear adsorptive parameters of the soils in different intervals to adsorb benzene from aqueous solution. |
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| Keywords: | fractal porous medium particle-size distribution adsorption |
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