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首页> 外文期刊>International Journal of Heat and Mass Transfer >Heat transfer and effectiveness experimentally-based analysis of wire coil with core-rod inserted in Fe_3O_4/water nanofluid flow in a double pipe U-bend heat exchanger
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Heat transfer and effectiveness experimentally-based analysis of wire coil with core-rod inserted in Fe_3O_4/water nanofluid flow in a double pipe U-bend heat exchanger

机译：双管U形弯管换热器中Fe_3O_4 /水纳米流中插入芯棒的盘管的传热和基于实验的有效性分析

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摘要

Heat transfer, friction factor, and effectiveness-number of transfer units were estimated experimentally for different volume concentrations of Fe3O4 nanofluid flow in an inner tube of a double pipe U-bend heat exchanger with different pitch ratios (p/d) of wire coil with core-rod (WCCR) inserts. The experiments were conducted at different particle volume concentrations (0.005%, 0.01%, 0.03% and 0.06%), different Reynolds numbers (16000-29000) and different pitch ratios of WCCR inserts (p/d = 1,1.34 and 1.79). The Nusselt number, for a 0.06% volume concentration of nanofluid, is enhanced up to 9.76% and 14.76% at Reynolds number of 16545 and 28954, respectively when compared to water data with a pumping penalty of 10%. Similarly, the Nusselt number is further enhanced to 25.39% and 37.90% for 0.06% nanofluid with wire coil with core-rod insert of p/d = 1 at Reynolds number of 16545 and 28954, respectively compared to water. Nusselt number and friction factor correlations were proposed based on the experimental data. The effectiveness-number of transfer units (NTU) were calculated for wateranofluids flow in a tube with WCCR inserts. (C) 2019 Elsevier Ltd. All rights reserved.
机译：在不同螺距比（p / d）的双管U型弯管换热器内管中，以不同体积浓度的Fe3O4纳米流体流，通过实验估算了传热，摩擦系数和传递单元的有效数量。芯棒（WCCR）刀片。实验是在不同的颗粒体积浓度（0.005％，0.01％，0.03％和0.06％），不同的雷诺数（16000-29000）和不同的WCCR刀片螺距比（p / d = 1,1.34和1.79）下进行的。与水数据相比，抽水罚分为10％时，对于0.06％体积浓度的纳米流体，Nusselt数在雷诺数为16545和28954时分别提高到9.76％和14.76％。类似地，对于0.06％纳米流体，与水相比，雷诺数分别为16545和28954的芯棒插入物为p / d = 1的线圈，努塞尔特数进一步提高至25.39％和37.90％。根据实验数据提出了努塞尔数与摩擦系数的相关性。计算了带有WCCR插入件的管中水/纳米流体流动的转移单位的有效数量（NTU）。 （C）2019 Elsevier Ltd.保留所有权利。

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