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首页> 外文期刊>International Journal of Heat and Mass Transfer >Natural convection in partially divided square enclosures: Effects of thermal boundary conditions and thermal conductivity of the partitions
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Natural convection in partially divided square enclosures: Effects of thermal boundary conditions and thermal conductivity of the partitions

机译：部分分隔的方形围护结构中的自然对流：热边界条件和隔板的导热系数的影响

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摘要

Natural convection in partitioned square enclosures filled with air is numerically studied, trying to characterize these enclosures mainly in what concerns its overall heat transfer performance. Two partitions of finite thickness are considered, placed in the enclosure following an ordered arrangement, which position, length and thermal conductivity are varied for some values of Rayleigh number and for different thermal boundary conditions. Study starts considering the simplest enclosures with two adiabatic partitions, after the more realistic enclosures of heat conductive walls and partitions are considered, and finally the even more realistic situation of enclosures with heat conductive partitions and walls subjected to cyclic thermal boundary conditions in the vertical direction is also considered. Position and length of the enclosures' effects depend on the thermal boundary conditions prescribed for the enclosure, and different thermal boundary conditions (corresponding to the heating or cooling operations or seasons) are considered to capture this effect. Fluid flow field, thermal field and heat transfer are analyzed for some particular situations through the streamlines, isotherms, and heatlines. The overall thermal performance of the enclosure is analyzed through the overall Nusselt number, and many data are compactly presented for different placements and lengths of the partitions, for different thermal conductivity of the walls and partitions of the enclosure, for different Rayleigh numbers and for different thermal boundary conditions imposed to the enclosure. Considered boundary conditions and the enclosure walls and partitions of finite thickness and finite thermal conductivity are much more realistic conditions than simply the single cavity without walls and with perfectly adiabatic partitions usually considered in many studies of this kind.
机译：数值研究了充满空气的分隔式方形围护结构中的自然对流，试图对这些围护结构进行特征化描述，主要是考虑其整体传热性能。考虑了两个有限厚度的隔板，它们按照有序排列放置在外壳中，对于某些瑞利数值和不同的热边界条件，其位置，长度和热导率会发生变化。研究开始考虑具有两个绝热隔板的最简单的罩壳，在考虑了更现实的导热壁和隔板的罩壳之后，最后，在垂直方向上经受周期性热边界条件的带有导热隔板和壁的罩壳的更为现实的情况也被考虑。外壳效果的位置和长度取决于为外壳指定的热边界条件，并考虑了不同的热边界条件（对应于加热或冷却操作或季节）来捕获此效果。通过流线，等温线和热线针对某些特定情况分析了流体流场，热场和传热。通过整体Nusselt数分析了机柜的整体热性能，并紧凑地提供了有关隔板的不同放置和长度，隔板的壁和隔板的热导率，不同的瑞利数和不同的许多数据对外壳施加的热边界条件。考虑到边界条件以及有限厚度和有限导热率的围护壁和隔板，比简单的无壁且具有绝热隔板的单腔通常在许多此类研究中要实际得多。

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