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Experimental and numerical investigation of contact heat transfer between a rotating heat pipe and a steel strip

机译:旋转热管与钢带接触传热的实验与数值研究

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摘要

A new concept for energy efficient annealing of steel strip comprises of multiple rotating heat pipes. Each heat pipe extracts heat from the cooling strip which is reused to increase the temperature of the heating strip. In this context, the heat transfer between the steel strip and the rotating heat pipe is investigated. When the strip is transported over the heat pipe, gas entrains in the gap. The gas compresses into a uniform gas layer. The contact heat transfer deteriorates due to this phenomenon. A numerical model to quantify the heat transfer between the surfaces is developed. Since there is no direct way to quantify the heat transfer between two moving surfaces, the problem is divided into a gas entrainment and a heat transfer part. The model is validated with experiments executed on a rotating heat pipe test rig. The validation was made varying the strip thickness, specific tension and strip velocity. The results show a uniform gas layer forming within the first 1° of the 180° wrap angle in all cases. The heat transfer is dominated by gas conduction. Results for the uniform gas layer region yield heat transfer coefficients in the range between 4000 and 20,000 W/m2·K.
机译:钢带的节能退火的新概念包括多个旋转热管。每个热管从冷却条中提取热量,然后再利用这些热量来提高加热条的温度。在本文中,研究了钢带和旋转热管之间的热传递。当钢带在热管上运输时,气体夹带在间隙中。气体压缩成均匀的气体层。由于这种现象,接触传热变差。建立了量化表面之间热传递的数值模型。由于没有直接的方法来量化两个运动表面之间的传热,因此问题分为夹带气体和传热部分。该模型通过在旋转热管试验台上进行的实验进行验证。通过改变带材厚度,比张力和带材速度来进行验证。结果表明在所有情况下均在180°包角的第一个1°内形成了均匀的气体层。传热以气体传导为主导。均匀气体层区域的结果得出的传热系数在4000至20,000 W / m2·K之间。

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