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首页> 外文期刊>Energy Conversion & Management >Influence of triangle tube structure with twisted tape on the thermo-hydraulic performance of nanofluids in heat-exchange system based on thermal and exergy efficiency
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Influence of triangle tube structure with twisted tape on the thermo-hydraulic performance of nanofluids in heat-exchange system based on thermal and exergy efficiency

机译：三角管结构对捻线带对热交换系统纳米流体热水性能的影响

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摘要

An experiment is carried out to research the thermo-hydraulic performance of TiO2-H2O nanofluids in triangle tubes while taking the effect of twisted tapes into consideration. The theories of thermal and exergy efficiency are applied to estimate this system. The influence of mass fractions of nanoparticles (0.1 wt%, 0.3 wt% and 0.5 wt%), Reynolds numbers (Re = 800-9000), different structures of triangle tubes (isosceles right triangle tube (tube 1), isosceles 45 degrees triangle tube (tube 2)) and twisted tape on the Nusselt number, Nusselt number ratio, resistance coefficient, resistance coefficient ratio and pressure drop are experimentally studied respectively. Results show that there are three positive factors for heat transfer performance including large nanoparticles concentration, large Reynolds number and existence of the twisted tape. Compared with the smooth tube, tubes (tubes 1 and 2) with twisted tape can enhance heat transfer, but that without twisted tape can deteriorate heat transfer, for heat transfer performance, tube 2 is better than tube 1. Tube 2 with twisted tape has the biggest value of comprehensive performance index R3. A better exergy efficiency performance can be obtained when Reynolds number is greater than 5000 and the exergy efficiency reaches the best when Re = 8000.
机译：进行了实验，以研究三角形管中TiO2-H2O纳米流体的热水液压性能，同时考虑扭曲胶带的效果。施加热量效率的理论以估算该系统。纳米颗粒质量分数（0.1wt％，0.3wt％和0.5wt％），雷诺数（Re = 800-9000），三角形管的不同结构（等腰右三角管（管1），等腰45度三角形实验研究管（管2））和扭曲胶带，露珠数，电阻系数，电阻系数，电阻系数比和压降。结果表明，传热性能存在三种阳性因素，包括大纳米粒子浓度，大雷诺数和扭曲的捻线。与光滑的管，管（管1和2）与双绞带可以增强传热，但没有扭曲胶带可以劣化热传递，用于传热性能，管2比管1更好。带绞带的管2综合性能指数R3的最大值。当雷诺数大于5000时，可以获得更好的效率性能，并且当RE = 8000时，电源效率达到最佳效率。

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