دانلود رایگان مقاله بررسی تاثیر دیوار بر انتقال حرارت ابر همرفت در یک کانال نانو با شبیه سازی دینامیکی مولکولی – سال 2020
مشخصات مقاله:
عنوان فارسی مقاله:
بررسی تاثیر دیوار بر انتقال حرارت ابر همرفت در یک کانال نانو با شبیه سازی دینامیکی مولکولی
عنوان انگلیسی مقاله:
Investigating the wall effect on convective heat transfer in a nanochannel by molecular dynamics simulation
کلمات کلیدی مقاله:
شبیه سازی دینامیک مولکولی، شماره نوسلت، انتقال گرما همرفتی، نانو کانال، خشونت، جریان پوزویل
مناسب برای رشته های دانشگاهی زیر:
مهندسی مکانیک
مناسب برای گرایش های دانشگاهی زیر:
مکانیک سیالات
وضعیت مقاله انگلیسی و ترجمه:
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فهرست مطالب:
Abstract
Keywords
Nomenclature
1. Introduction
2. Methodology
2.1. Model and simulation details
2.2. Simulation procedure and flow creation
2.3. Governing equations
3. Results and discussion
3.1. Validation
3.2. Investigating the fluid flow
3.3. The effect of nanochannel size
3.4. The effect of wall material
3.5. The effect of wall roughness
4. Conclusion
Declaration of competing interest
References
قسمتی از مقاله انگلیسی:
1. Introduction
Heat transfer in fluids is one of the most attractive and complex phenomena in the fluid mechanics, which has always been noticeable to researchers due to its importance in industrial equipment. The investigation of fluid flow and convective heat transfer in macroscale have been well done using experimental and theoretical methods. In microscale, the use of both experimental and theoretical methods is possible, although experimental studies are expensive and difficult. Also, in this scale, the liquid can be theoretically treated either as a continuum or as a collection of particles [1]. Mala et al. [2] experimentally studied water flow in microtubes and showed that flow characteristics for microtubes with small diameters diverge from the predictions of the conventional theory. Peng et al. [3] experimentally investigated the effect of geometrical parameters on convective heat transfer of water in a microchannel. They showed that in a microchannel, heat transfer of laminar flow is complex and different from that in conventional channels. Wang et al. [4] studied forced convection of water in a microchannel. Their experimental results indicated that heat transfer characteristics of laminar flow is affected by microchannel size. Peng et al. [5] experimentally investigated forced convective heat transfer and flow characteristics of water in a microchannel. They showed that the geometric configuration (aspect ratio) of the microchannel is one of the parameters affecting heat transfer of laminar flow. Wu et al. [6] performed an experimental study on laminar convective heat transfer in the microchannel. They investigated different surface conditions and found that laminar Nusselt number depends on geometric parameters. They stated that the values of Nusselt number increase with increasing the surface roughness and surface hydrophilic property. Zhang et al. [7] investigated heat transfer of laminar flow in rough microchannels. They showed that heat transfer performance of the rough microchannels is improved compared to the smooth channels. Generally, at microscale due to the larger surface to volume ratio, surface factors have more impact on flow and heat transfer characteristics that are quite different from those of conventional scales [8]. When channel size is further reduced, empirical studies and many theoretical correlations face a great challenge. Molecular dynamics simulation is an effective method to investigate the fluid flow and transport phenomena at the nanoscale, which is based on the integration of particle motion equations [9,10]. Kumar et al. [11] used molecular dynamics simulation to study water-like molecules placed between two plates. They indicated that thermodynamic properties of water changes relative to its bulk properties. Giovambattista et al. [12] examined water molecules confined between hydrophobic and hydrophilic surfaces and illustrated that the water density near the hydrophilic surfaces is different from the hydrophobic ones. Lv et al. [13] investigated the behavior of nanofluid confined between two walls and showed that a solid-like layer of liquid atoms exists near walls. Sun et al. [14] studied the behavior of nanofluid in a nanochannel. They showed that distribution of number density has fluctuations near the walls. They stated that the reason for this phenomenon is strong Ar–Cu interactions. Kim et al. [15] investigated water flow in both rough and smooth channels.
