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首页> 外文期刊>Arabian Journal for Science and Engineering >Optimization of Conical Micro-Diffusers and Micro-Nozzles Considering Entropy Generation
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Optimization of Conical Micro-Diffusers and Micro-Nozzles Considering Entropy Generation

机译：考虑熵产生的锥形微扩散器和微喷嘴的优化

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摘要

Fluid flow characteristics and entropy generation in a circular diffuserozzle element are studied numerically. The flow is assumed to be isothermal, laminar and incompressible with constant thermo-physical properties. The velocity field, mass flow rate, and entropy generation are investigated for several half angles in combination with several values of pressure drops. The effect of diffuser half angle on the entropy generation is investigated and discussed. Furthermore, the effect of the half angle of diffuser on the diffuser efficiency and the effect on the rectification efficiency are explained. It is shown that there is an optimum operation half angle for which the diffuser efficiency has a maximum value. In the case of a micro-diffuser 1 mm long with an inlet diameter of 100 μm, the optimum half angle was found to be 2.5°. These results are based on several parametric simulations ranging from 0 to 7° half angles and covering pressure drops between 500 and 2000 Pa.
机译：数值研究了圆形扩散器/喷嘴元件中的流体流动特性和熵产生。假定该流动是等温的，层流的并且具有恒定的热物理性质不可压缩。结合几个压力降值研究了几个半角的速度场，质量流率和熵产生。研究并讨论了扩散器半角对熵产生的影响。此外，说明了扩散器的半角对扩散器效率的影响以及对整流效率的影响。示出了存在最佳的工作半角，对于该半角，扩散器效率具有最大值。对于进口直径为100μm的1 mm长的微扩散器，最佳半角为2.5°。这些结果基于几个参数模拟，范围从0到7°半角，覆盖了500至2000 Pa之间的压降。

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