Investigation of Visco-rheological Properties of Polymeric Fluid on Electrothermal Pumping

سال انتشار: 1403
نوع سند: مقاله ژورنالی
زبان: انگلیسی
مشاهده: 73

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شناسه ملی سند علمی:

JR_JACM-10-1_013

تاریخ نمایه سازی: 15 آبان 1402

چکیده مقاله:

Electrothermal pumping is a recently trending method to force highly conductive fluids in a wide range of microfluidics applications with biological processes. Although most polymer fluids (biological and synthetic) are highly conductive exhibiting viscoelastic rheological properties that are relevant to biomedical applications, their behavior under the effect of electrothermal force has not yet been studied. To this aim, the PTT model (non-linear rheological constitutive equation) and electrothermal equations are implemented in the developed OpenFOAM solver. The effect of rheological characteristics of the fluids on the physical parameters such as velocity, elastic behavior, and vortices strength of electrothermal flow are investigated through the viscoelastic non-dimensional numbers. According to the results, electrothermal outlet velocity decreases by ۷۲۶% as the retardation ratio (β number) increases from ۰.۲ to ۰.۹ and increases by ۱۰۷% as the Weissenberg number raises from ۰.۰۰۱ to ۱۰. Investigating all non-dimensional numbers simultaneously leads to the conclusion that higher electrothermal velocity is achieved by viscoelastic fluids with lower viscosity and higher relaxation time. This fact is useful for choosing the proper fluid for a particular application. As a practical example, ۳۰۰۰ ppm polyethylene oxide solution results in higher velocity in electrothermal flow compared to the ۵% polyvinylpyrrolidone and ۲۰۰۰ ppm xanthan gum solution.

نویسندگان

Nima Hedayati

Faculty of Mechanical Engineering, Microfluidics and MEMs Lab, Babol Noshirvani University of Technology, Babol, Iran

Abas Ramiar

Faculty of Mechanical Engineering, Microfluidics and MEMs Lab, Babol Noshirvani University of Technology, Babol, Iran

Kurosh Sedighi

Faculty of Mechanical Engineering, Microfluidics and MEMs Lab, Babol Noshirvani University of Technology, Babol, Iran

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