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首页> 外文期刊>International Journal of Applied Engineering Research >A Comparison of Mixed Convection Heat Transfer in Upward Stepped Tilted Constant Area Pipe between Air and Diesel Exhausted Gas
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A Comparison of Mixed Convection Heat Transfer in Upward Stepped Tilted Constant Area Pipe between Air and Diesel Exhausted Gas

机译：空气和柴油耗尽气体向上阶梯式倾斜恒定区域管中混合对流传热比较

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The widespread diesel engines usage has many advantages, such as electricity generating units with 500 kVA and above, which mainly takes a great attention in countries and places suffering from a large lack of daily supplying electricity. These may need to about 12 units to cover one populated kilometer. These engines play an important role in environmental pollution problems all over the world. Pollutions generated from exhaust emissions are the main responsible factor for environmental pollutions, and they lead to many problems of health. Many policies have been imposed worldwide in recent years to reduce negative effects of diesel engine emissions on human health and environment. Many research efforts have been carried out on both diesel exhaust pollutant emissions and aftertreatment emission control technologies. The aftertreatment systems convert the pollutant gases separately into non-pollutant compounds. Studies show that its function depends on exhaust gas temperature and velocity. This paper deals with a comparison of laminar mixed heat transfer in circular different inclination pipe with 0, 45 and 90 degrees angle between fresh air and diesel exhaust gas (DEG). They are examined at a constant heat flux of 115 and 816 W-m~(-2) for 450 and 2008 Reynolds numbers. The results show a clear increase in temperature distribution and a clear decrease in local Nusselt number grow with the exhaust gas pipe inclination increase. This will help to modify the aftertreatment design parameters, their inclination and more generally the most important a trial to solve such environmental problem.
机译：广泛的柴油发动机使用具有许多优点，例如具有500 kVA及以上的电力发电单元，主要在国家和遭受日常供电缺乏的地区的巨大缺乏的地方。这些可能需要大约12个单位来覆盖一个人口稠密的公里。这些发动机在世界各地的环境污染问题中起着重要作用。废排放产生的污染是环境污染的主要负责因素，它们导致了许多健康问题。近年来，近年来，在全球范围内施加了许多政策，以减少柴油机排放对人类健康和环境的负面影响。在柴油排气污染物排放和后处理排放控制技术方面已经进行了许多研究努力。后处理系统将污染物分别转化为非污染物化合物。研究表明，其功能取决于废气温度和速度。本文涉及在新鲜空气和柴油废气（DEG）之间的0,45和90度的圆形不同倾斜管中的层状混合热传递比较。它们以115和816 W-M〜（-2）的恒定热通量检查450和2008雷诺数。结果表明，温度分布的明显增加，局部冲泡数量随着废气管倾斜度的增加而明显降低。这将有助于修改后处理设计参数，倾向，更普遍是解决这些环境问题的最重要的试验。

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