Experimental study and numerical simulation of laminar flow of compressed air class A foam in horizontal pipe

doi:10.11949/j.issn.0438-1157.20180226

Abstract

Abstract:

Compressed air class A foam is a two-phase compressible non-Newtonian fluid with unbalanced self-organization structure. Numerical simulation of laminar flow of compressed air class A foam was studied. Foam with various expansion ratio could be used in different practical engineering. For the sake of guarantee on the reliability of the simulation, it is necessary to study on the compressibility and the rheological property of compressed air class A foam. As one kind of compressible fluid, the internal pressure of foam surges exponentially with the increase of the compression on the volume. In the process of compression, foam with different expansion ratio could keep stable without coalescence and breakage. In addition, foam with various expansion ratio has property of shear thinning while rheological behavior of foam satisfies with the model of Herschel-Bulkley. Taking the above factors into consideration, the numerical simulation software named Fluent was used to simulate the laminar flow of foam with various expansion ratio in the horizontal circular pipe of which the diameter is 15 mm and 25 mm. The pressure drop gradually increases with the flow process of the fluid when diameter of pipe is 15 mm. The downward trend of pressure in the pipe with diameter of 25 mm is relatively slow, while the pressure drop per meter is approximate to the fixed value. Verified by the experiment of foam transportation in pipe, this method possesses reliability and accuracy in a certain degree. The deviation of simulation could be controlled within 10%.

Key words: foam, non-Newtonian fluids, viscosity, numerical simulation

摘要：

压缩空气A类泡沫是具有非平衡自组织结构的两相可压缩非牛顿流体，针对不同发泡倍数的泡沫特性进行水平管路压降实验及数值模拟研究。泡沫具有良好的压缩性能，其内部压力随着压缩体积的增加呈指数型增长，并在1 MPa的实验压力下可保持结构稳定而不发生泡沫破碎。泡沫属于非牛顿流体，具有剪切变稀的性质，其黏度流变行为符合Herschel-Bulkley模型。综合考虑其压缩性能及黏度变化，运用Fluent数值模拟软件针对不同发泡倍数的泡沫在水平管路中的层流流动进行模拟，并通过实验检验其压降模拟结果的可靠性，结果表明其误差可控制在10%以内，模拟方法具有一定的准确性。

关键词: 泡沫, 非牛顿流体, 黏度, 数值模拟

CLC Number:

TQ569

WANG Yongkai, GAO Hong, SONG Bo, LIN Quansheng, XIA Jianjun. Experimental study and numerical simulation of laminar flow of compressed air class A foam in horizontal pipe[J]. CIESC Journal, 2018, 69(10): 4184-4193.

王勇凯, 高红, 宋波, 林全生, 夏建军. 压缩空气A类泡沫水平管路压降实验及数值模拟[J]. 化工学报, 2018, 69(10): 4184-4193.

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