tailieunhanh - Báo cáo hóa học: " Numerical evaluation of laminar heat transfer enhancement in nanofluid flow in coiled square tubes"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Numerical evaluation of laminar heat transfer enhancement in nanofluid flow in coiled square tubes | Sasmito et al. Nanoscale Research Letters 2011 6 376 http content 6 1 376 o Nanoscale Research Letters a SpringerOpen Journal NANO EXPRESS Open Access Numerical evaluation of laminar heat transfer enhancement in nanofluid flow in coiled square tubes Agus Pulung Sasmito1 2 Jundika Candra Kurnia1 and Arun Sadashiv Mujumdar1 2 Abstract Convective heat transfer can be enhanced by changing flow geometry and or by enhancing thermal conductivity of the fluid. This study proposes simultaneous passive heat transfer enhancement by combining the geometry effect utilizing nanofluids inflow in coils. The two nanofluid suspensions examined in this study are water-Al2O3 and water-CuO. The flow behavior and heat transfer performance of these nanofluid suspensions in various configurations of coiled square tubes . conical spiral in-plane spiral and helical spiral are investigated and compared with those for water flowing in a straight tube. Laminar flow of a Newtonian nanofluid in coils made of square cross section tubes is simulated using computational fluid dynamics CFD approach where the nanofluid properties are treated as functions of particle volumetric concentration and temperature. The results indicate that addition of small amounts of nanoparticles up to 1 improves significantly the heat transfer performance however further addition tends to deteriorate heat transfer performance. Introduction Convective heat transfer can be enhanced by active as well as passive methods. While the former usually provide better enhancement it requires additional external forces and or equipment which can increase the complexity capital and operating costs of the system. In contrast passive heat transfer enhancement can be achieved by changing flow geometry or modifying thermo-physical properties of working fluid. Hence it is generally a more desirable approach when compared to an active method. In our previous study 1-3 Sasmito AP Kurnia JC Mujumdar AS Numerical .

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