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首页> 外文期刊>Journal of Thermal Engineering >Numerical Simulation and Analysis of Heat Transfer for Different Geometries of Corrugated Tubes in a Double Pipe Heat Exchanger
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Numerical Simulation and Analysis of Heat Transfer for Different Geometries of Corrugated Tubes in a Double Pipe Heat Exchanger

机译：双管换热器中不同几何形状波纹管传热的数值模拟与分析

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摘要

In thepresent study, effect of different geometries of inner and outer tube surfaces on heat transfer of a doublepipe heat exchanger is studied. Water CuO nanofluid, that is assumed to be a single phase, flows in the outer tube.Two equation standard κ ε turbulence model is used to model the turbulent flow. Simulations are done for differentcases include convex, concave and smooth surfaces for inner and outer tubes at different Reynolds numbers. Resultsshow that the maximum heat transfer corresponds to the convex concave case in comparison with the smooth smoothone. Heat transfer rate increases with the Reynolds number, but the slope of the increase for nanofluid is lesser thanthat for the pure fluid. It is demonstrated that the friction factor decreas es with the Reynolds number, so the pressuredrop decreases as the Reynolds number increases. Also, the simulations are done for two other nanofluids, water ZnOoxide and water SiSiO2 dioxide with a volume fraction of 3%. It is found that water CuO nanofluid flow leads to moreheat transfer rate in a double pipe heat exchanger in comparison with the other nanofluids.
机译：在本研究中，研究了内，外管表面的不同几何形状对双管换热器传热的影响。假定为单相的水CuO纳米流体在外管中流动。使用两个方程式标准κε湍流模型对湍流进行建模。针对不同情况进行了仿真，包括不同雷诺数的内管和外管的凸，凹和光滑表面。结果表明，与光滑冰沙相比，最大传热对应于凸凹情况。传热速率随着雷诺数的增加而增加，但是纳米流体的增加斜率小于纯流体的增加斜率。结果表明，摩擦系数随雷诺数的增加而减小，因此压降随雷诺数的增加而减小。此外，还对体积分数为3％的其他两种纳米流体（水氧化锌和水氧化硅二氧化硅）进行了仿真。发现与其他纳米流体相比，水CuO纳米流体流在双管热交换器中导致更多的传热速率。

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