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首页> 外文期刊>Heat Transfer Research >EFFECTS OF WALL CONJUGATION AND FLUID AXIAL CONDUCTION IN CIRCUMFERENTIALLY PARTLY HEATED PIPES AND MINIPIPES
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EFFECTS OF WALL CONJUGATION AND FLUID AXIAL CONDUCTION IN CIRCUMFERENTIALLY PARTLY HEATED PIPES AND MINIPIPES

机译：围绕部分加热管和微潮壁缀合和流体轴向传导的影响

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摘要

Transient conjugated heat transfer in circumferentially partly heated thick-walled pipes and minipipes with thermally developing laminar flows is investigated, involving three-dimensional wall conduction and fluid axial conduction. The problem is handled for an initially isothermal, two-regional infinite pipe, for which the upstream region is completely insulated and the downstream region is circumferentially partly insulated by considering an instant increase in the outer wall temperature of the other circumferential part in the downstream region. Solution is made numerically by a finite-difference method, and a parametric study is conducted to analyze the effects of four defining parameters, namely, the Peclet number, wall-to-fluid thermal conductivity ratio, wall-to-fluid thermal diffusivity ratio, and wall thickness ratio, on heat transfer characteristics. The results show that in both the wall and the fluid sides, besides backward heat transfer due to axial conduction, a large amount of heat is transferred because of angular conduction from the circumferentially heated to the unheated part of the pipe. Wall conjugation highly compensates the effects of partial heating and an important percentage of heat transfer to fluid is realized from the unheated circumferential part of the pipe. The results are also seen to be much affected by the parameter values.
机译：研究了在周向部分加热的厚壁管中的瞬态共轭传热和具有热显影层流的微型潮端，涉及三维壁传导和流体轴向传导。该问题是针对最初等温的两个区域无限管道处理，上游区域完全绝缘，并且通过考虑下游区域中的另一个圆周部分的外壁温度的瞬间增加，下游区域通过瞬时增加而周向部分绝缘。解决方案通过有限差分法在数值上进行，并且进行参数研究以分析四个定义参数，即PECLET数，壁 - 流体导热率，壁到流体热扩散率比的影响，和壁厚比率，传热特性。结果表明，在壁和流体侧面，除了由于轴向传导引起的后向热传递之外，由于从周向加热到管道的未加热部分而导致大量的热量。壁缀合高度补偿了部分加热的影响，并且从管道的未加热的圆周部分实现了流体的传热百分比。结果也观察到受参数值的影响很大。

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