پديد آورنده :
اشرف منصوري، صبا
عنوان :
مطالعه آزمايشگاهي اثر نانوذرات سيليكا بر ضريب نفوذ جرمي و فرآيند استخراج مايع - مايع
گرايش تحصيلي :
مهندسي شيمي
محل تحصيل :
اصفهان: دانشگاه صنعتي اصفهان، دانشكده مهندسي شيمي
صفحه شمار :
پانزده،100ص.: مصور
استاد راهنما :
محسن نصر اصفهاني
استاد مشاور :
نسرين اعتصامي، غلامحسين عظيمي
توصيفگر ها :
نانوسيال , انتقال جرم , PFG- NMR , برج استخراج پاششي , ميكرو استخراج
استاد داور :
احمد محب، عليرضا سليماني نظر، محمدرضا طلائي
تاريخ ورود اطلاعات :
1395/01/15
كد ايرانداك :
ID852 دكتري
چكيده فارسي :
۳ ۱ ۱ آماده سازي نمونه ها ۵۳ ۳ ۱ ۲ آزمايش هاي ۳۷ PFG NMR ۳ ۲ بررسي آزمايشگاهي ثر نانو ذر ت بر فرآيند ستخر ج مايع مايع ثر قطر قطره و جهت نتقال جرم ۸۳ ۳ ۲ ۱ برج ستخر ج پاششي و روش كار ۸۳ ۳ ۲ ۲ سيستم شيميايي و آماده سازي نانو سيال ۲۴ ۳ ۳ بررسي آزمايشگاهي ثر نانو ذر ت بر فرآيند ميكرو ستخر ج ۳۴ ۳ ۳ ۱ سيستم ميكرو ستخر ج ۳۴ ۳ ۳ ۲ سيستم شيميايي و آماده سازي نانو سيال ۴۴ ۳ ۳ ۳ روش آزمايشگاهي ۵۴ فصل چهارم نتايج و بحث ۴ ۱ نتايج و بحث مربوط به ند زه گيري ضريب نفوذ جرمي در حضور نانو ذر ت ۸۴ ۴ ۲ نتايج و بحث مربوط به ثر نانو ذر ت بر فرآيند ستخر ج مايع مايع ثر قطر مختلف قطره ها ۷۵ ۴ ۳ نتايج و بحث مربوط به ثر نانو ذر ت بر فرآيند ستخر ج مايع مايع ثر جهت نتقال جرم ۶۶ ۴ ۴ نتايج و بحث مربوط به ثر نانو ذر ت بر فرآيند ستخر ج مايع مايع در سيستم ميكرو ستخر ج ۴۷ فصل پنجم نتيجه گيري كلي و پيشنهاد ت ۵ ۱ نتيجه گيري كلي ۲۸ ۵ ۲ پيشنهاد ت ۴۸ مر جع ۵۸ چكيده نگليسي ۱۰۱ نه
چكيده انگليسي :
Experimental Investigation of the Influence of Silica Nanoparticles onMass Diffusion Coefficient and Liquid Liquid Extraction Process Seyedeh Saba Ashrafmansouri s ashrafmansouri@ce iut ac ir Department of Chemical Engineering Isfahan University of Technology Isfahan 8415683111 IranDegree Ph D Language FarsiProf Mohsen Nasr Esfahany mnasr@cc iut ac irAbstractColloids composed of ultrafine nanoparticles 100 nm or smaller are called nanofluids Metals semiconductors carbon nanotubes and oxide ceramics are certain materials which are dispersed ina host liquid such as water and organic liquids to make the nanofluids Recently nanofluids havereceived growing attention because of their potential to enhance heat transfer Since someresearchers considered Brownian movement of nanoparticles as the responsible factor in theenhancement of heat transfer investigation of mass transfer enhancement in nanofluids withsimilar mechanism has been initiated Investigations on mass transfer in nanofluids can be dividedinto two main groups The first group of studies deals with studying diffusion coefficients innanofluids and the second group of studies focuses on convective mass transfer coefficients innanofluids In this thesis water self diffusion coefficient and tracer diffusion coefficient of tert butanol in water based silica nanofluids were measured by using pulsed field gradient nuclearmagnetic resonance PFG NMR method for silica nanoparticle volume fractions ranged from0 005 to 1 at three different temperatures 15 25 and 35 C Insignificant enhancement mostly less than 10 increase in both water self diffusion coefficient and tracer diffusioncoefficient of tert butanol in nanofluids was observed Also the influence of silica nanoparticles onhydrodynamics and mass transfer of a counter current spray liquid liquid extraction column wasstudied experimentally The chemical system of toluene acetic acid water was used and the dropswere toluene based nanofluids containing 0 0005 0 01 vol silica nanoparticles In addition tonanoparticles fraction in nanofluids the effects of dispersed phase drop sizes were evaluatedmaking use of three different distributors with different hole diameters The experiments wereperformed at fixed volumetric flow rates of dispersed and continuous phases and both mass transferdirections The results showed that silica nanoparticles have no significant influence on thehydrodynamic parameters while maximum enhancement of 47 4 and 107 5 in overall masstransfer coefficient respectively for mass transfer direction of dispersed to continuous phase andvice versa were achieved for drops generated by the distributor with the largest hole diameter andsilica nanoparticle concentration of 0 001 vol Moreover the influence of hydrophobic silicananoparticles on mass transfer in a membrane based micro contactor was studied The extractionsystem of toluene acetone water was used and the organic phase was a toluene based nanofluidcontaining 0 001 to 0 1 volume percent vol hydrophobic silica nanoparticles The experimentswere performed at various volumetric flow rates of organic and aqueous phases and at masstransfer direction from the organic to the aqueous phase The results showed that nanoparticles aremore effective on mass transfer at low flow rates Maximum enhancement of about 31 in overallmass transfer coefficient was observed using 0 001 vol silica nanoparticles In all experiements silica nanoparticle concentration of 0 001 vol was observed as the optimum concentration Athigher and lower nanoparticle concentrations smaller mass transfer coefficients were observed Brownian motion of nanoparticles and induced microconvection are dominant in lowconcentrations of nanoparticles resulting in enhanced mass transfer Nanoparticle aggregation reduction in free volume and increase in tortuosity of the diffusion path because of solidnanoparticles presence are responsible for deteriorated mass transfer in higher nanoparticleconcentrations Keywords Nanoflui
استاد راهنما :
محسن نصر اصفهاني
استاد مشاور :
نسرين اعتصامي، غلامحسين عظيمي
استاد داور :
احمد محب، عليرضا سليماني نظر، محمدرضا طلائي
