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Experimental Investigation of a Closed Loop Impedance Pump with an Asymmetric Wall

Garg, Rachit
http://rave.ohiolink.edu/etdc/view?acc_num=akron153325523527243

Abstract Details

2018, Master of Science, University of Akron, Mechanical Engineering.
Impedance pumps work on a principle that does not require valves to transfer fluid. Perturbing an elastic material fixed with inelastic ends, propagates a unidirectional wave causing fluid displacement. This method of pumping is useful in various biomedical and engineering applications, such as pumping of sensitive bio-fluids (e.g. blood), micro displacement pumps and many more. This experimental research investigation quantifies the increase in net positive displacement of fluid inside a closed loop compliant micro-structured tubing subject to periodic perturbations by varying the wall cross sectional geometry of an elastic test specimen. Five various set of asymmetric walls test specimens were designed, fabricated, and net pumping performance was quantified. Comparisons were made with the baseline having symmetric cross sectional area. It was hypothesized that perturbing thinner wall of an asymmetric tube, with a thicker boundary opposing it, contributes a higher net positive fluid displacement inside a closed loop. Experimental results obtained when compared to baseline were unexpected. The root cause was investigated, by capturing test specimen images using a high speed camera. It was discovered that the design of the test specimen must take in account the modulus of elasticity when selecting material. A video-graphic comparison was made between the fabricated test specimen made of TangoPlus FLX930 in this study and a commercially available hyper elastic material known as latex. Some external changes based on a hypothesis that adding rigid body in contact with thicker wall opposing perturbations should increase fluid flow, were made with the asymmetric test specimens and a solid bar was placed in contact with the thicker boundary wall against the probe perturbations, in attempt to keep the specimen in the desired geometry, and a significant improvement in average flowrate for various frequency was measured in subsequent analysis. This study concluded, that the creation of an efficient miniature pump is conceivable by making certain changes in design and material considerations to the test specimen. Experimental and high speed imaging data from this experiment may be useful to mimic the flows better and efficient at micro level.
Nicholas Garafolo, Dr. (Advisor)
Scott Sawyer, Dr. (Committee Member)
129 p.
Biomedical Engineering; Mechanical Engineering
compliant tube; flexible tube; elastic tube; asymmetric wall; asymmetric test specimen; impedance pump; elastic test section; elastic test specimen; periodic perturbations; TangoPlus FLX930; micro pump; impedance pump efficiency

Recommended Citations

Citations

  • Garg, R. (2018). Experimental Investigation of a Closed Loop Impedance Pump with an Asymmetric Wall [Master's thesis, University of Akron]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=akron153325523527243

    APA Style (7th edition)

  • Garg, Rachit. Experimental Investigation of a Closed Loop Impedance Pump with an Asymmetric Wall. 2018. University of Akron, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=akron153325523527243.

    MLA Style (8th edition)

  • Garg, Rachit. "Experimental Investigation of a Closed Loop Impedance Pump with an Asymmetric Wall." Master's thesis, University of Akron, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=akron153325523527243

    Chicago Manual of Style (17th edition)

akron153325523527243
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This open access ETD is published by University of Akron and OhioLINK.