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Local wall heat transfer coefficient measurement in a packed bed of cylinders using infrared (IR) thermography technique and application of random packing of cylindrical particles inside concentric tube heat exchangers with water as working medium

机译:局部壁传热系数测量在瓶盖瓶盖中使用红外(IR)热成像技术,以及在同心管热交换器内与水作为工作介质的圆柱形颗粒随机包装

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摘要

Heat transfer enhancement is challenging area in which different techniques are utilized to dissipate the generated heat during operation. Packed beds are devices which enhance heat transport while being compact and are used in several applications such as energy storage, heat exchange devices, catalysis, food processing etc. In the present study, the behavior of wall heat transfer coefficient with randomized packing of equal aspect ratio cylinders is investigated. In this work, the local wall heat transfer coefficient is calculated from local wall temperature data obtained using infrared (IR) thermography in packed beds with randomized packing of cylinders under steady state conditions with water as the working fluid. The randomized packing of cylinders is done inside a concentric tube heat exchanger and the heat transfer enhancement is studied. Experiments are conducted for bed to equivalent particle diameter ratio 2 using random packing of mono-dispersed glass cylinders (d(cyl)=6mm and l(cyl)=6mm). The local wall temperatures are measured using an infrared (IR) camera while the fluid flow takes place through the packed beds. In literature, it is found that wall region contribution to heat transfer is above 90%. The comparison of enhancement in heat transfer for both packing of spheres and cylinders inside concentric tube heat exchangers is done and it is observed that the random sphere packing is superior to cylinder packing.
机译:传热增强是具有挑战性的区域,其中利用不同的技术在操作期间消散产生的热量。包装的床是在本研究中加强电压的设备,同时紧凑,诸如储能,热交换装置,催化,食品加工等的几种应用中,壁传热系数与随机包装的平等方面的行为研究了比率圆柱体。在这项工作中,局部壁传热系数由使用红外(IR)热成像在填充床中获得的局部壁温度数据计算,其中稳态条件下的圆柱体的随机包装用水作为工作流体。圆柱体的随机包装在同心管热交换器内完成,并研究了传热增强。使用单分散的玻璃圆筒(D(CYL)= 6mm和L(CYL)= 6mm的随机包装,对等效粒径比进行实验。使用红外(IR)相机测量局部壁温度,而流体流通过填充床。在文献中,发现壁区域对传热的贡献高于90%。完成了用于在同心管热交换器内部填充球体和气缸的传热增强的比较,并且观察到随机球包装优于气缸填料。

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