论文标题
从下方照射的纳米流体填充外壳中的传热和流体流动机制的建模和分析
Modeling and Analysis of Heat Transfer and Fluid Flow Mechanisms in Nanofluid Filled Enclosures Irradiated from Below
论文作者
论文摘要
辐射驱动的运输机制在许多自然流和工业过程中无处不在。为了模仿和更好地理解这些过程，最近对辐射加热的纳米流体填充的外壳进行了广泛的研究。目前的工作实质上是量化和理解此类围栏中涉及的运输机制的确定步骤。特别是，在层流的情况下，已经研究了从底部照射的二维平方纳米填充的外壳。已经研究了纳米流体光学深度，外壳的倾斜角，入射通量和边界条件（绝热和等温）的影响。此外，在体积到混合到表面吸收模式的情况下，已经对温度和流场进行了仔细的分析。在绝热边界条件下，无论入射通量幅度（在5WM-2至50WM-2之间变化），外壳倾斜角（在0至60度之间变化）和吸收模式（表面，混合或体积），稳态无条件实现。但是，如果有等温边界；自然对流的发作及其过渡到瞬态状态受到吸收方式和围墙倾斜角的影响。
Radiation driven transport mechanisms are ubiquitous in many natural flows and industrial processes. To mimic and to better understand these processes, recently, radiatively heated nanofluid filled enclosures have been extensively researched. The present work is essentially a determining step in quantifying and understanding the transport mechanisms involved in such enclosures. In particular, a two dimensional square nanofluid filled enclosure irradiated from the bottom has been investigated in laminar flow situation. Effects of nanofluid optical depth, inclination angle of the enclosure, incident flux, and boundary conditions (adiabatic and isothermal) have been investigated. Moreover, the temperature and flow fields have been carefully analyzed in the situation ranging from volumetric to mixed to surface absorption modes. Under adiabatic boundary conditions, steady state is unconditionally achieved irrespective of the incident flux magnitude (varied between 5Wm-2 to 50Wm-2), enclosure inclination angle (varied between 0 to 60 degrees) and mode of absorption (surface, mixed or volumetric). However, in case of isothermal boundaries; onset of natural convection and its transition into transient regime is significantly impacted by the mode of absorption and the enclosure inclination angle.
