نوع مقاله : مقاله پژوهشی (کاربردی)
نویسندگان
عضو هیئت علمی، گروه مهندسی مکانیک، دانشگاه فنی و حرفهای، تهران، ایران
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
In this article, the forced displacement heat transfer of nanofluid flow in horizontal curved tubes with a four-sided cross-section, under heat flux, has been numerically simulated. A homogeneous nanofluid of aluminum oxide particles and water has been used as the based fluid. Continuity, momentum and energy equations and the control volume method are used to numerically solve the flow. In this study, the effects of secondary flows, centrifugal force, and buoyancy on the flow field are considered, and the effect of Reynolds number, volume fraction of nanoparticles, the effect of curved surface in different geometries on the amount of heat transfer and pressure drop is investigated. The results are presented in the cantour of flow and temperature parallel lines as well as Nusselt number and pressure graphs. Heat transfer and pressure drop in different concentrations of solid particles and different Reynolds numbers have been compared. The results show that by increasing the volume fraction of solid particles from 0 to 5%, the heat transfer increases up to 10% and the pressure drop increases by 100%. Also, by increasing the Reynolds number from 100 to 900, the heat transfer and pressure drop inside the knee increases up to two times. According to the results, the concave surface from inside the tube has a greater effect on heat transfer than the convex surface.
کلیدواژهها [English]
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