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首页> 外文期刊>International journal of numerical methods for heat & fluid flow >Energy saving with using of elliptic pillows in turbulent flow of two-phase water-silver nanofluid in a spiral heat exchanger
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Energy saving with using of elliptic pillows in turbulent flow of two-phase water-silver nanofluid in a spiral heat exchanger

机译：用螺旋换热器中两相水银纳米流体的湍流中使用椭圆形枕头的节能

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Purpose - Increasing heat transfer rate in spiral heat exchangers is possible by using conventional methods such as increasing number of fluid passes and counter flowing. In addition, newer ideas such as using pillows as baffles in the path of cold and hot fluids and using nanofluids can increase heat transfer rate. The purpose of this study is to simulate turbulent flow and heat transfer of two-phase water-silver nanofluid with 0-6 Vol. % nanoparticle concentration in a 180° path of spiral heat exchanger with elliptic pillows. Design/methodology/approach - In this simulation, the finite volume method and two-phase mixture model are used. The walls are subjected to constant heat flux of q" = 150,000 Wm~(-2). The inlet fluid enters curves path of spiral heat exchanger with uniform temperature T_(in) = 300 K. After flowing past the pillows and traversing the curved route, the working fluid exchanges heat with hot walls and then exits from the section. In this study, the effect of radiation is disregarded because of low temperature range. Also, temperature jump and velocity slipping are disregarded. The effects of thermophoresis and turbulent diffusion on nanofluid heat transfer are disregarded. By using finite volume method and two-phase mixture model, simulations are performed. Findings - The results show that the flow and heat transfer characteristics are dependent on the height of pillows, nanoparticle concentration and Reynolds number. Increasing Reynolds number, nanoparticle concentration and pillow height causes an increase in Nusselt number, pressure drop and pumping power. Originality/value - Turbulent flow and heat transfer of two-phase water-silver nanofluid of 0-6 per cent volume fraction in a 180° path of spiral heat exchanger with elliptic pillows is simulated.
机译：目的 - 通过使用诸如越来越多的流体通过和计数器流动，可以增加螺旋热交换器中的传热速率。此外，较新的想法，例如使用枕头作为冷热流体路径和使用纳米流体的挡板可以增加传热速率。本研究的目的是模拟两相水银纳米流体的湍流和热传递，0-6体积。用椭圆枕头的螺旋热交换器的180°路径中的％纳米粒子浓度。设计/方法/方法 - 在该模拟中，使用有限体积法和两相混合模型。壁的恒定热通量为Q“= 150,000wm〜（-2）。入口流体进入螺旋热交换器的曲线路径，螺旋热交换器具有均匀的温度T_（IN）= 300k。在流过枕头并穿过弯曲之后途径，工作流体用热壁交换热量，然后从该部分出口。在该研究中，由于低温范围，辐射的效果被忽略。此外，耐热性和湍流扩散的温度跳跃和速度滑动忽略纳米流体传热。通过使用有限体积法和两相混合模型，进行模拟。结果表明，流量和传热特性取决于枕头，纳米粒子浓度和雷诺数的高度。增加Reynolds数，纳米粒子浓度和枕头高度导致露珠数量增加，压力下降和泵送电量。原创性/值 - 湍流和他在用椭圆枕头的180°路径的180°PAT中转移0-6％的体积分数，模拟椭圆枕的螺旋热交换器。

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