Investigation of temperature jump and slip effects on nanofluid treatment inside a vertical annulus via modified Buongiorno’s model

Ghaffarianjam, Hamidreza; A. Moshizi, Sajad; Zamani, Mahdi; Amiri Daluee, Mahdi

doi:10.22061/jcarme.2019.5265.1653

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	Investigation of temperature jump and slip effects on nanofluid treatment inside a vertical annulus via modified Buongiorno’s model
Journal of Computational & Applied Research in Mechanical Engineering (JCARME)
مقاله 18، دوره 10، شماره 2 - شماره پیاپی 20، تیر 2021، صفحه 511-524 اصل مقاله (947.25 K)
نوع مقاله: Research Paper
شناسه دیجیتال (DOI): 10.22061/jcarme.2019.5265.1653
نویسندگان
Hamidreza Ghaffarianjam^* ¹؛ Sajad A. Moshizi²؛ Mahdi Zamani³؛ Mahdi Amiri Daluee⁴
¹Department of Mechanical Engineering, Islamic Azad University, Gonabad Branch, Gonabad, Iran
²Young Researchers and Elite Club, Neyshabur Branch, Islamic Azad University, Neyshabur, Iran
³Young Researchers and Elite Club, Gonabad Branch, Islamic Azad University, Gonabad, Iran
⁴Faculty of Civil Engineering and Environment, Khavaran Institute of Higher Education, Mashhad, Iran
تاریخ دریافت: 25 اردیبهشت 1398، تاریخ بازنگری: 25 آذر 1398، تاریخ پذیرش: 25 آذر 1398
چکیده
In the present work, the study of alumina-water nanofluid heat transfer between two concentric vertical cylinders has been done by modified Buongiorno’s model (BM) to examine the impacts of temperature jump and slip velocity boundary conditions for a wide range of Knudsen number. Runge-Kutta-Fehlberg method, as a standard integration scheme along with a shooting method, has been chosen for solving nonlinear ordinary differential equations (ODEs) along with boundary conditions. The main concentration of this paper is on the temperature jump since the slip velocity has been extensively examined in many studies. The presence of temperature jump boundary condition by varying Knudsen number was considered to investigate the effects of the bulk mean nanoparticle volume fraction ϕ_B, mixed convection parameter Nr, buoyancy parameter Ng, and heat flux ratio ε on the total dimensionless heat transfer coefficient HTC and the dimensionless pressure gradient N_dp. The obtained results indicate that temperature jump boundary condition plays a pivotal role in temperature profile, heat transfer coefficient and pressure drop; for instance, the negligence of temperature jump near walls causes to undervalue heat transfer coefficient in continuum flow regime and overestimate it in slip flow regime.
کلیدواژه‌ها
Nanofluid؛ Modified Buongiorno’s model؛ Temperature jump؛ Slip velocity؛ Mixed convection

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Investigation of temperature jump and slip effects on nanofluid treatment inside a vertical annulus via modified Buongiorno’s model