عنوان مقاله :
مطالعه آزمايشگاهي و شبيه‌سازي CFD انتقال حرارت راكتور پرشده تحت تأثير ديواره: اثر شكل دانه كاتاليستي و حالت قرارگيري آن بر تشكيل نقاط داغ با استفاده از روش تاگوچي
عنوان به زبان ديگر :
Experimental Study and CFD Simulation of Heat Transfer Fixed Bed Affected by The wall: Particle Rotation and Location Effects on Hot Spots Creation Using Taguchi Method
پديد آورندگان :
زارع، ﻣﻬﺪي داﻧﺸﮕﺎه ﻋﻠﻢ و ﺻﻨﻌﺖ اﯾﺮان - داﻧﺸﮑﺪه ﻣﻬﻨﺪﺳﯽ ﺷﯿﻤﯽ، ﻧﻔﺖ و ﮔﺎز - آزﻣﺎﯾﺸﮕﺎه دﯾﻨﺎﻣﯿﮏ ﺳﯿﺎﻻت ﻣﺤﺎﺳﺒﺎﺗﯽ , ﻫﺎﺷﻢآﺑﺎدي، ﺣﺴﻦ داﻧﺸﮕﺎه ﻋﻠﻢ و ﺻﻨﻌﺖ اﯾﺮان - داﻧﺸﮑﺪه ﻣﻬﻨﺪﺳﯽ ﺷﯿﻤﯽ، ﻧﻔﺖ و ﮔﺎز - آزﻣﺎﯾﺸﮕﺎه دﯾﻨﺎﻣﯿﮏ ﺳﯿﺎﻻت ﻣﺤﺎﺳﺒﺎﺗﯽ
كليدواژه :
داﻧﻪ اﺳﺘﻮاﻧﻪاي , اﺳﺘﻮاﻧﻪاي ﺷﯿﺎردار , ﺳﻪﭘﺮ , اﻧﺘﻘﺎل ﺣﺮارت , ﺑﺴﺘﺮ ﭘﺮﺷﺪه , دﯾﻨﺎﻣﯿﮏ ﺳﯿﺎﻻت ﻣﺤﺎﺳﺒﺎﺗﯽ , CFD , ﺗﺄﺛﯿﺮ دﯾﻮاره , ﻧﻘﻄﻪ داغ , ﺗﺎﮔﻮﭼﯽ
چكيده فارسي :
در ﻣﻄﺎﻟﻌﻪ ﺣﺎﺿﺮ اﻧﺘﻘﺎل ﺣﺮارت ﺗﮏداﻧﻪ ﮐﺎﺗﺎﻟﯿﺴﺘﯽ )اﺳﺘﻮاﻧﻪاي، اﺳﺘﻮاﻧﻪاي ﺷﯿﺎردار و ﺳﻪﭘﺮ( ﺑﻪ ﺗﺮﺗﯿﺐ ﺑﺎ ﻧﺴﺒﺖ ﻗﻄﺮ ﺑﺴﺘﺮ ﺑﻪ ﻗﻄﺮ داﻧﻪ )N( 6/7 ،5/1 ،4/5 در ﻣﺠﺎورت دﯾﻮاره ﺑﺴﺘﺮ ﺑﻪﺻﻮرت آزﻣﺎﯾﺸﮕﺎﻫﯽ و ﻋﺪدي ﻣﻄﺎﻟﻌﻪ ﺷﺪ. در ﻗﺴﻤﺖ ﻋﺪدي ﺑﻪﻣﻨﻈﻮر ﺣﻞ ﻣﻌﺎدﻻت ﻣﻮﻣﻨﺘﻮم، ﭘﯿﻮﺳﺘﮕﯽ و اﻧﺮژي از روش اﺟﺰاي ﻣﺤﺪود )FEM( اﺳﺘﻔﺎده ﮔﺮدﯾﺪ. ﺑﻪﻣﻨﻈﻮر اﻋﺘﺒﺎرﺳﻨﺠﯽ روش ﻋﺪدي از دادهﻫﺎي آزﻣﺎﯾﺸﮕﺎﻫﯽ اﺳﺘﻔﺎده ﺷﺪ. ﻧﺘﺎﯾﺞ ﻧﺸﺎن داد ﮐﻪ ﺳﻪ ﻧﺎﺣﯿﻪ ﻣﻬﻢ در اﻃﺮاف داﻧﻪ وﺟﻮد دارﻧﺪ: ﻧﺎﺣﯿﻪ ﺳﺮﻋﺖﭘﺎﯾﯿﻦ در ﻣﺠﺎورت داﻧﻪ، ﻓﻀﺎي ﺑﯿﻦ داﻧﻪ و دﯾﻮاره و ﻓﻀﺎي ﭘﺸﺖ داﻧﻪ. ﺑﺎ ﮐﺎﻫﺶ ﻓﺎﺻﻠﻪ داﻧﻪ-دﯾﻮاره ﺗﺄﺛﯿﺮ دﯾﻮاره ﺑﺮ ﻣﯿﺰان اﻧﺘﻘﺎل ﺣﺮارت ﺑﺮرﺳﯽ ﺷﺪ. ﻧﺘﺎﯾﺞ ﻧﺸﺎن داد ﮐﻪ داﻧﻪ اﺳﺘﻮاﻧﻪاي و اﺳﺘﻮاﻧﻪاي ﺷﯿﺎردار ﺑﺮاي 0/143≤yc/Dp اﯾﺠﺎد ﻧﻘﻄﻪ داغ ﻣﯽﮐﻨﻨﺪ و زواﯾﺎي θz=90 و 60=θa ﺑﯿﺶﺗﺮﯾﻦ اﺣﺘﻤﺎل اﯾﺠﺎد ﻧﻘﺎط داغ را دارﻧﺪ. درﻧﻬﺎﯾﺖ ﺑﺎ اﺳﺘﻔﺎده از روش ﺗﺎﮔﻮﭼﯽ ﺑﻪ ﺑﺮرﺳﯽ ﺣﺎﻟﺖ ﻗﺮارﮔﯿﺮي ﺑﻬﯿﻨﻪ داﻧﻪ در ﻣﺠﺎورت دﯾﻮاره ﭘﺮداﺧﺘﻪ ﺷﺪ.
چكيده لاتين :
In this study, the heat transfer of a single catalyst particle (cylindrical, sg-cylindrical, and tri-lobe) beside the bed wall was studied experimentally and numerically with the bed to particle diameter ration (N) of 4.5, 5.1, 6.7 respectively. In the numerical section, the Finite Element Method (FEM) was applied to solve the momentum, continuity, and Energy. Experimental data was used to validate the numerical results. The results showed that three are the important area around the catalyst particle: low-velocity fluid around the particle, space between the particle and bed wall, and space behind the particle. The wall effects on the heat transfer were studied by reducing the distance of the particle-bed wall. Results showed that cylindrical and sg-cylindrical particles face hot-spot for yc/Dp≤0.143 and θa=60 and θz=90 degrees are the highest probable degrees for hot-spot creation. Finally, the Taguchi method was used to find the optimized particle location around the bed wall.
