fa بررسی ویسکوزیته دینامیکی نانوسیال هیبریدی حاوی MWCNT و TiO2 با درصدهای 40 و 60 با استفاده از روش RSM تخصصي Special پژوهشي Research <div style="text-align: justify;"><span style="font-size:11pt"><span style="line-height:115%"><span style="direction:rtl"><span style="unicode-bidi:embed"><span b="" nazanin="" style="font-family:"><span lang="FA" style="font-size:12.0pt"><span style="line-height:115%">در این مطالعه، انواع رابطه</span></span> <span lang="FA" style="font-size:12.0pt"><span style="line-height:115%">&shy;های همبستگی توسط مدل&shy;</span></span> <span lang="FA" style="font-size:12.0pt"><span style="line-height:115%">های مختلف برای پیش‌بینی ویسکوزیته دینامیکی نانوذرات </span></span><span dir="LTR" style="font-size:12.0pt"><span style="line-height:115%"><span new="" roman="" style="font-family:" times="">MWCNT</span></span></span><span lang="FA" style="font-size:12.0pt"><span style="line-height:115%"> و </span></span><span dir="LTR" style="font-size:12.0pt"><span style="line-height:115%"><span new="" roman="" style="font-family:" times="">TiO₂</span></span></span><span style="font-size:12.0pt"><span style="line-height:115%"> (40 به 60) </span></span><span lang="FA" style="font-size:12.0pt"><span style="line-height:115%">در سیال پایه </span></span><span dir="LTR" style="font-size:12.0pt"><span style="line-height:115%"><span new="" roman="" style="font-family:" times="">SAE40</span></span></span><span lang="FA" style="font-size:12.0pt"><span style="line-height:115%"> با به‌کارگیری روش آماری ‌</span></span><span dir="LTR" style="font-size:12.0pt"><span style="line-height:115%"><span new="" roman="" style="font-family:" times="">RSM</span></span></span><span style="font-size:12.0pt"><span style="line-height:115%"> تحت شرایط دمایی 25 تا 50 درجه سانتی</span></span> <span lang="FA" style="font-size:12.0pt"><span style="line-height:115%">گراد، کسر حجمی </span></span></span></span></span></span><span style="unicode-bidi:embed"><span b="" nazanin="" style="font-family:"><span style="font-size:12.0pt"><span new="" roman="" style="font-family:" times="">0.0625</span></span></span></span><span style="line-height:115%"><span style="direction:rtl"><span style="unicode-bidi:embed"><span b="" nazanin="" style="font-family:"><span lang="FA" style="font-size:12.0pt"><span style="line-height:115%"> تا 1 درصد و نرخ برشی</span></span></span></span></span></span><span style="unicode-bidi:embed"><span b="" nazanin="" style="font-family:"><span style="font-size:12.0pt"><span new="" roman="" style="font-family:" times="">665.5S^-1&nbsp;</span></span></span></span><span style="line-height:115%"><span style="direction:rtl"><span style="unicode-bidi:embed"><span b="" nazanin="" style="font-family:"><span lang="FA" style="font-size:12.0pt"><span style="line-height:115%">تا </span></span><span dir="LTR" style="font-size:12.0pt"><span style="line-height:115%"><span new="" roman="" style="font-family:" times="">S^-1</span></span></span><span lang="FA" style="font-size:12.0pt"><span style="line-height:115%">9333 موردبررسی قرار گرفت. مدل</span></span> <span lang="FA" style="font-size:12.0pt"><span style="line-height:115%">های مختلف </span></span><span dir="LTR" style="font-size:12.0pt"><span style="line-height:115%"><span new="" roman="" style="font-family:" times=""><span style="color:#0d0d0d">2Fi</span></span></span></span><span lang="FA" style="font-size:12.0pt"><span style="line-height:115%"><span style="color:#0d0d0d">، </span></span></span><span dir="LTR" style="font-size:12.0pt"><span style="line-height:115%"><span new="" roman="" style="font-family:" times="">Quadrat</span></span></span><span lang="FA" style="font-size:12.0pt"><span style="line-height:115%"><span style="color:#0d0d0d">،</span></span></span><span dir="LTR" style="font-size:12.0pt"><span style="line-height:115%"><span new="" roman="" style="font-family:" times=""> Qubic </span></span></span><span lang="FA" style="font-size:12.0pt"><span style="line-height:115%">و </span></span><span dir="LTR" style="font-size:12.0pt"><span style="line-height:115%"><span new="" roman="" style="font-family:" times="">&nbsp;Quartic</span></span></span><span lang="FA" style="font-size:12.0pt"><span style="line-height:115%"> در مطالعه حاضر بررسی می‌شود. این 4 مدل مختلف بر اساس معیارهای سنجش مورد تجزیه‌وتحلیل قرار می‌گیرد. همبستگی، انحراف استاندارد، ضریب تعیین، قابلیت اطمینان و مقادیر </span></span><span dir="LTR" style="font-size:12.0pt"><span style="line-height:115%"><span new="" roman="" style="font-family:" times="">P</span></span></span> <span lang="FA" style="font-size:12.0pt"><span style="line-height:115%">پارامترهای مهمی هستند که برای مقایسه مدل</span></span> <span lang="FA" style="font-size:12.0pt"><span style="line-height:115%">ها از آن استفاده‌شده است</span></span><span lang="FA" style="font-size:12.0pt"><span style="line-height:115%">.</span></span> <span lang="FA" style="font-size:12.0pt"><span style="line-height:115%">تأثیر دما در تعیین ویسکوزیته از تغییرات نرخ برش</span></span> <span lang="FA" style="font-size:12.0pt"><span style="line-height:115%">و کسر حجمی جامد پرنقش</span></span> <span lang="FA" style="font-size:12.0pt"><span style="line-height:115%">تر است. مدل </span></span><a name="_Hlk153728970"><span dir="LTR" style="font-size:12.0pt"><span style="line-height:115%"><span new="" roman="" style="font-family:" times="">Quartic</span></span></span></a> <span lang="FA" style="font-size:12.0pt"><span style="line-height:115%">بر اساس ضریب تعیین با مقدار</span></span></span></span></span></span><span style="unicode-bidi:embed"><span b="" nazanin="" style="font-family:"><span style="font-size:12.0pt"><span new="" roman="" style="font-family:" times="">(R²=0.9994)</span></span></span></span><span style="line-height:115%"><span style="direction:rtl"><span style="unicode-bidi:embed"><span b="" nazanin="" style="font-family:"><span style="font-size:12.0pt"><span style="line-height:115%">&nbsp;&nbsp;به‌عنوان مدل برتر انتخاب شد.</span></span><span dir="LTR" style="font-size:12.0pt"><span style="line-height:115%"><span style="font-family:"Times New Roman",serif"></span></span></span></span></span></span></span></span><br> &nbsp;</div> <div style="text-align: justify;"><span style="font-size:11pt"><span style="unicode-bidi:embed"><span b="" nazanin="" style="font-family:"><span style="font-size:12.0pt"><span new="" roman="" style="font-family:" times="">In this study, the types of correlation of different models to predict the dynamic viscosity of MWCNT and TiO₂ nanoparticles (40 to 60) in SAE40 base fluid by using RSM statistical method under temperature conditions of 25 to 50 degrees Celsius, volume fractions of 0.0625 to 1% and the shear rate of 665.5S^-1to 9333S^-1 are investigated. Different 2Fi, Quadrat, Qubic and Quartic models are investigated in this study. These 4 different models are analyzed based on the measurement criteria. Correlation, standard deviation, coefficient of determination, reliability and P values are important parameters used to compare models. The viscosity of the nanofluid increases with the reduction of the shear rate as well as the temperature and the increase of the volume fraction. The effect of temperature in determining viscosity is more important than the changes in shear rate and solid volume fraction among these 4 models. Based on the coefficient of determination (R²=0.9994), the Quaritc model is selected as the best model.</span></span></span></span></span><br> &nbsp;</div> نانوسیال, ویسکوزیته, نانوذرات, کسر حجمی , دماو,MWCNT TiO2 Nanofluid, viscosity, nanoparticles, volume fraction, temperature, MWCN, TiO2 0 0 http://jeed.dezful.iau.ir/browse.php?a_code=A-10-409-1&slc_lang=fa&sid=1 Mobin Karamian مبین کرمیان mobinkaramian@yahoo.com 10031947532846005673 10031947532846005673 Yes Department of Energy Conversion, Faculty of Civil Engineering, Water and Energy, Imam Hossein University,Tehran دانشکده عمران، آب و انرژی، دانشگاه جامع امام حسین (علیه السلام)، تهران