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Influence of a curved conical turbulator on heat transfer augmentation in a helical double-pipe heat exchanger

机译：弯曲锥形湍流器对螺旋双管热交换器中传热增强的影响

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摘要

The rate of heat transfer in helical pipes is much more than straight pipes. In the present study, heat transfer and fluid flow in a double-coil heat exchanger with an innovative swirl generator with a curved structure in the inner channel (hot side) are studied, numerically. The proposed turbulator has a curved structure and 12 blades to produce swirl flows. Also, two holes are considered at the semi-conical part of the turbulator. The effects of geometrical parameters of the proposed turbulator including the inner radius of the turbulator and the radius of the turbulator's holes are evaluated. Results indicate that the maximum effectiveness belongs to the case with inner diameter of the turbulator and radius of tur-bulator' holes equal to 19 and 3.6 mm, respectively, at m = 0.008 kg/s. Also, the generated swirl flows by the turbulator has a significant influence on heat transfer augmentation. Furthermore, a high inner radius of the turbulator leads to an increase in heat transfer rate and effectiveness, consequently. As a result, by increasing the inner radius of turbulator by 26.7%, the effectiveness rises by 80% (maximum at m = 0.008 kg/s). Increasing the radius of turbulator's hole by 133.34% leads to an growth in effectiveness of about 50% (maximum at m = 0.058 kg/s).
机译：螺旋管中的传热速率远远超过直管。在本研究中，在数值上研究了具有在内通道（热侧）中的具有弯曲结构的创新旋流发生器的双线管热交换器中的传热和流体流动。所提出的湍流器具有弯曲的结构和12叶片以产生旋流。而且，在湍流器的半圆锥形部分中考虑两个孔。评估了包括湍流器内半径的所提出的湍流器的几何参数和湍流孔的半径。结果表明，最大效率属于湍流器内径的情况和湍流孔的半径分别等于19和3.6mm，在m = 0.008kg / s。而且，湍流器的产生的旋流流动对传热增强具有显着影响。此外，湍流的高内半径导致热传递速率和有效性的增加。结果，通过将湍流器的内半径增加26.7％，其有效性升高了80％（最大值为M = 0.008千克/秒）。将湍流孔的半径增加133.34％导致有效性约50％的生长（M = 0.058kg / s）。

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