Simulation of Flow and Heat Transfer of Nanofluid in an Eccentric Annulus with Multicomponent Lattice Boltzmann Method
سال انتشار: 1395
نوع سند: مقاله ژورنالی
زبان: انگلیسی
مشاهده: 155
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شناسه ملی سند علمی:
JR_JAFM-9-5_046
تاریخ نمایه سازی: 3 بهمن 1400
چکیده مقاله:
In the present study, Lattice Boltzmann method is employed to investigate a two dimensional mixed convection heat transfer of Al۲O۳-water nanofluid in a horizontal annulus between a cold outer cylinder and the hot, rotating inner cylinder. To do so, the double lattice Boltzmann equation is utilized for the base fluid and the nanoparticles to describe the dynamic as well as the thermal behavior of nanofluid. Moreover, different forces such as Brownian, drag and gravity acting on the nanoparticles are taken into consideration. Calculations have been performed for Rayleigh number ranging from ۱۰۳ to ۲×۱۰۴, Reynolds number from ۵ to ۱۲۰, vertical and horizontal eccentricity from -۰.۷۵ to ۰.۷۵ with volume fraction of nanoparticles from ۰ to ۰.۱. The current computational results reveal that by adding nanoparticles, the mean Nusselt number for Ra ۱۰۴, it decreases. Also, with Re>۸۰, the mean Nusselt number increases with increasing Reynolds number; although for low Reynolds number this rising trend is not observed. Besides, when the inner cylinder moves vertically upward from the center, the addition of nanoparticles increases Nusselt number relative to the base fluid.
کلیدواژه ها:
Multicomponent lattice Boltzmann method ، Nanofluid ، Eccentric annulus ، Heat transfer ، Nanoparticles
نویسندگان
A. Rostamzadeh
School of Mechanical Engineering, Shiraz University, Shiraz, Iran Molasadra Str., Shiraz, ۷۱۹۳۶-۱۶۵۴۸, Iran.
E. Goshatsbi Rad
School of Mechanical Engineering, Shiraz University, Shiraz, Iran Molasadra Str., Shiraz, ۷۱۹۳۶-۱۶۵۴۸, Iran.
K. Jafarpur
School of Mechanical Engineering, Shiraz University, Shiraz, Iran Molasadra Str., Shiraz, ۷۱۹۳۶-۱۶۵۴۸, Iran.