Industrial ventilation and heat dissipation time are important factors due to high temperature and emissivity coefficients of heat source conducive to radiation and convection produced indoors. The main aim of this study was to investigate the separate effects of four different gases (air; nitrogen, N₂; carbon dioxide, CO₂; and water vapor) on radiation/convection in an industrial complex with a heat source. The heat source surface is opaque or semi-transparent and two radiation models, P1 and discrete ordinate (DO), are compared in different Grashof numbers (Gr), ranging from 10⁸ to 10¹¹. Surface transparency has the most and the least effects on CO₂ and water vapor, respectively. Water vapor has efficient natural ventilation at all heater lengths. High absorption coefficient (a_p) at high Gr prevents dampening effects of radiative relative to convective parameters. The radiation model type for precise numerical simulation is indispensable with a_p reduction. The opaque surface is most efficient to transfer energy only in the temperature distribution specific area, while the semi-transparent surface concentrates on temperature rise around the heater itself. The Nusselt of radiation (Nu_r) in P1 is more than ^DO model for all gases. Incident radiation for CO₂ and water vapor follows a complete descending trend with progressive distance from heater, while a peakand trough trend is observed for N₂ and air.

中文翻译：

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出厂设置下四种透明气体的辐射对流的加热器透明度的离散纵坐标和基于P1的近似值

工业通风和散热时间是重要的因素，这是由于高温和热源的发射系数会导致室内产生辐射和对流。这项研究的主要目的是研究四种不同气体（空气，氮气，N ₂，二氧化碳，CO ₂和水蒸气）对具有热源的工业园区内辐射/对流的单独影响。热源表面是不透明或半透明的，并且在10 ⁸到10 ^11的不同Grashof数（Gr）中比较了两个辐射模型P1和离散纵坐标（DO）。表面透明度对CO _2的影响最大和最小和水蒸气。水蒸气在所有加热器长度下均具有有效的自然通风。高Gr时的高吸收系数（a _p）防止了辐射相对于对流参数的衰减作用。为精确数值模拟的辐射模型类型与不可缺少一个_p减小。仅在温度分布特定区域中，不透明表面最有效地传递能量，而半透明表面则集中在加热器自身周围的温度升高上。对于所有气体，P1中的辐射Nusselt（Nu _r）都大于^ DO模型。CO _2的入射辐射水蒸气跟随一个完整的下降趋势，与加热器的距离逐渐增加，而N ₂和空气则出现一个峰谷趋势。