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首页> 外文期刊>International Journal of Heat and Mass Transfer >Laminar convective heat transfer in chaotic configuration
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Laminar convective heat transfer in chaotic configuration

机译：层流对流换热传热

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摘要

The convective heat transfer in chaotic configuration of circular cross-section under laminar flow regime at different values of Dean number and Prandtl number is investigated numerically. The chaotic configuration is the combination of 90° bends and coils. The insertion of equidistant 90° bends between the two consecutive coil produces the phenomenon of flow inversion. The hydrodynamics and heat transfer under laminar flow conditions in the chaotic configuration with constant wall flux as a boundary condition is studied. The control-volume finite difference method with second-order accuracy is used. The chaotic configuration shows a 25-36% enhancement in the heat transfer due to chaotic mixing while relative pressure drop is 5-6%. The effect of Prandtl number on fully developed heat transfer coefficient is also reported. It is observed that heat transfer increases with increase in Prandtl number. The stretching and folding phenomenon in chaotic configuration is observed and discussed for heat transfer coefficient and pressure drop in the chaotic configuration. The cyclic oscillation behavior in the heat transfer coefficient with downstream distance in the chaotic configuration and coiled tube is also observed and discussed. It appeared that heat transfer is strongly influenced by flow inversion. The effect of boundary conditions on heat transfer performance in the chaotic configuration as well as in the coiled tube is also carried out. The study is further extended to predict hydrodynamics and heat transfer with temperature-dependent viscosity in the chaotic configuration. A comparative study for heat transfer and friction factor is also carried out for constant and temperature-dependent viscosity in coiled tube and chaotic configuration. It was observed that the heat transfer under heating condition with temperature-dependent viscosity is higher as compared to the constant viscosity result while friction factor shows the reverse phenomenon in the chaotic configuration.
机译：数值研究了Dean数和Prandtl数在层流状态下圆形截面混沌结构中的对流换热。混乱的配置是90°弯曲和线圈的组合。在两个连续的线圈之间插入等距的90°弯头会产生逆流现象。研究了以恒定壁流为边界条件的混沌结构在层流条件下的流体动力学和热传递。使用具有二阶精度的控制量有限差分法。混沌构型显示出由于混沌混合而使传热提高了25-36％，而相对压降为5-6％。还报道了普朗特数对充分发展的传热系数的影响。观察到，传热随着普朗特数的增加而增加。观察并讨论了混沌构型中的拉伸和折叠现象，并讨论了混沌构型中的传热系数和压降。还观察和讨论了在混沌构型和盘管中，传热系数随下游距离的循环振荡行为。看来，传热受流动反转的强烈影响。边界条件也对混沌结构以及盘管中的传热性能产生影响。该研究进一步扩展，以预测在混沌构型下具有随温度变化的粘度的流体动力学和传热。还进行了传热和摩擦因数的比较研究，以测定连续管和混沌构型中恒定和随温度变化的粘度。观察到，在加热条件下具有随温度变化的粘度的热传递与恒定粘度的结果相比更高，而摩擦系数在混沌构型中显示出相反的现象。

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