Valveless pumping using a two-stage impedance pump

Lee, V C C; Abakr, Yousif Abdalla; Woo, Ko-Choong

doi:10.1007/s11465-013-0270-x

Cited by 8 publications

(12 citation statements)

References 10 publications

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“…With respect to the third form feature—pump segmentation—, one might speculate that a Liebau-effect pump of such a design does not function as a single Liebau-effect pump but rather act as a chain of multiple, serially aligned Liebau-effect pumps. This speculation was inspired by experimental investigations of Lee and co-workers [ 87 , 88 , 119 ], who showed that a multi-stage Liebau-effect pump could generate higher pressure heads and higher flow rates than a single-stage Liebau-effect pump. Future studies may clarify how kinking improves the pumping efficiency of Liebau-effect pumps and whether one of the four above-mentioned mechanism may contribute to this effect.…”

Section: Resultsmentioning

confidence: 99%

“…Analyzing the behavior of a Liebau-effect pump in a closed pipe system has shown that such a pump can generate unidirectional fluid flow only if there is a mismatch of impedance present at its two ends with which it is connected to the pipe system [ 11 ]. Consequently, this flow is named impedance defined flow [ 11 ] and Liebau-effect pumps are frequently named impedance pumps [ 85 , 86 , 87 , 88 ]. Currently, the pumping effect generated by a Liebau-effect pump is explained by wave dynamics of its flexible wall [ 85 , 89 , 90 ].…”

Section: Methodsmentioning

confidence: 99%

“…In the present study, we have built an experimental apparatus that was used for analyzing the pumping functions of a Liebau-effect pump in two different geometric configurations: (1) in a straight tube configuration ( Figure 3 and Figure 4 A); and (2) in a “looped” tube configuration, which was characterized by the presence of three kinks ( Figure 4 B and Figure 5 ). In previous experimental studies, the behavior of Liebau-effect pumps was analyzed either in closed pipe systems [ 9 , 11 , 91 , 92 , 93 , 94 ] or in open pipe systems [ 5 , 8 , 85 , 86 , 87 , 88 , 92 , 95 , 96 ]. The experimental apparatus used in the present study was an open pipe system comprising two reservoirs (acrylic glass cylinders) and one Liebau-effect pump in the middle ( Figure 3 , Figure 4 and Figure 5 ).…”

Section: Methodsmentioning

confidence: 99%

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Kinking and Torsion Can Significantly Improve the Efficiency of Valveless Pumping in Periodically Compressed Tubular Conduits. Implications for Understanding of the Form-Function Relationship of Embryonic Heart Tubes

Hiermeier

Männer

2017

JCDD

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Valveless pumping phenomena (peristalsis, Liebau-effect) can generate unidirectional fluid flow in periodically compressed tubular conduits. Early embryonic hearts are tubular conduits acting as valveless pumps. It is unclear whether such hearts work as peristaltic or Liebau-effect pumps. During the initial phase of its pumping activity, the originally straight embryonic heart is subjected to deforming forces that produce bending, twisting, kinking, and coiling. This deformation process is called cardiac looping. Its function is traditionally seen as generating a configuration needed for establishment of correct alignments of pulmonary and systemic flow pathways in the mature heart of lung-breathing vertebrates. This idea conflicts with the fact that cardiac looping occurs in all vertebrates, including gill-breathing fishes. We speculate that looping morphogenesis may improve the efficiency of valveless pumping. To test the physical plausibility of this hypothesis, we analyzed the pumping performance of a Liebau-effect pump in straight and looped (kinked) configurations. Compared to the straight configuration, the looped configuration significantly improved the pumping performance of our pump. This shows that looping can improve the efficiency of valveless pumping driven by the Liebau-effect. Further studies are needed to clarify whether this finding may have implications for understanding of the form-function relationship of embryonic hearts.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Kinking and Torsion Can Significantly Improve the Efficiency of Valveless Pumping in Periodically Compressed Tubular Conduits. Implications for Understanding of the Form-Function Relationship of Embryonic Heart Tubes

Hiermeier

Männer

2017

JCDD

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“…But the design complexity plays a main role during decision making about the use of equipment of this type in the field conditions. Study of a new, progressive pump with elastic pipeline was performed in the publication [9]. The pump has no valves and seals.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

The working pressure research of piston pump RN-3.8

Kravchenko

Popov

Gnitko

2016

EEJET

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Досліджено вплив кута повороту кривошипа та рівня початкового тиску в комбінованому компенсаторі на вели чину тиску подачі розчинної суміші та пульсації її пода чі протягом робочого циклу однопоршневого розчинонасо са. Розроблено конструкцію поршневого розчинонасоса, який забезпечить стабільний тиск подачі, помірний рівень пульсації під час перекачування. Подано рекомендації сто совно його налаштувань для високоефективної експлуа тації у різних галузях промисловості Ключові слова: ступінь пульсації тиску, комбінований компенсатор, тиск подачі, кривошип, такт нагнітання, такт всмоктування, стиснуте повітря, хід поршня Исследовано влияние угла поворота кривошипа и вели чины начального давления в комбинированном компен саторе на величину давления подачи растворной смеси и пульсации ее подачи на протяжении рабочего цикла однопоршневого растворонасоса. Разработана конструк ция поршневого растворонасоса, который обеспечит ста бильное давление подачи, умеренный уровень пульсации при перекачивании. Приведены рекомендации относитель но его настроек для высокоэффективной эксплуатации в разных отраслях промышленности Ключевые слова: степень пульсации давления, ком бинированный компенсатор, давление подачи, кривошип, такт нагнетания, такт всасывания, сжатый воздух, ход поршня UDC 693.6.002.5

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“…In 2010, Rosenfeld's studied on the effects of sequential excitations on a single elastic tube and showed promising results where increase in flow rates was observed (Rosenfeld and Avrahami 2010). Similarly, Lee worked on a two-stage system, integrated from two single-stage systems (Lee et al 2013(Lee et al , 2014, and also showed an enhancement in the flow rates. However, Rosenfield's design showed higher complexities, where synchronizations of locations and excitation frequencies are prerequisites for an efficient pumping.…”

Section: Introductionmentioning

confidence: 99%

Performance evaluation of multi-stage open-loop impedance pump

Lee

Abakr

Woo

2017

Int J Mech Mater Eng

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Background: Impedance pump is a simple valveless pumping mechanism, which transports fluid through the mismatch of impedance in the system. Mismatch in impedance occurs when an asymmetrical periodic excitation is exerted on the elastic tube. Periodic asymmetrical excitation will then produce a unidirectional flow. Considering a multi-stage system with a single and constant power source, it is well expected that there would be pumping limitation to which the enhancement can reach. Methods: A multi-stage open-loop impedance pump is developed in the current work. The current work experimentally analyzes and evaluates the pumping performance of a multi-stage open-loop impedance pump, with emphasis on the flow rates induced and pumping limitation. Analyses of flow rates, pressure head and excitation frequencies are performed in its non-dimensional form. Results: Taking a single-stage system as benchmark, enhancement of 35 and 33.3% is shown in the flow rate and pressure head respectively for a two-stage system. Enhancement of 110 and 60% is shown in flow rate and pressure head of a three-stage system in comparison to the single-stage system. For four-stage system, however, only 27 and 46.7% increments are demonstrated in the flow rate and pressure head, respectively. Conclusions: The implementation of multi-stage system with single constant power input is demonstrated to be limited only to the three-stage system where the declined pumping performance is exhibited in a four-stage system.

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Valveless pumping using a two-stage impedance pump

Cited by 8 publications

References 10 publications

Kinking and Torsion Can Significantly Improve the Efficiency of Valveless Pumping in Periodically Compressed Tubular Conduits. Implications for Understanding of the Form-Function Relationship of Embryonic Heart Tubes

Kinking and Torsion Can Significantly Improve the Efficiency of Valveless Pumping in Periodically Compressed Tubular Conduits. Implications for Understanding of the Form-Function Relationship of Embryonic Heart Tubes

The working pressure research of piston pump RN-3.8

Performance evaluation of multi-stage open-loop impedance pump

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