Study on use of vibration to reduce soil adhesion

Wang, X.L; Ito, Nobuyasu; Kito, Koji; Garcia, Pastor P.

doi:10.1016/s0022-4898(98)00014-7

Cited by 34 publications

(13 citation statements)

References 2 publications

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“…This discrepancy might be due to differences in vibrational acceleration. In a previous publication examining soil separation from a plate, separation is enhanced by an increase in vibrational acceleration of the plate . The vibrational acceleration of the impeller, a exc , was calculated using the following formula, which is the derivative of Equation ():

a_{exc} = \frac{d U_{exc}}{dt} = - {4 π}^{2} f_{exc}^{2} A_{exc} \sin ω_{exc} t .

…”

Section: Discussionmentioning

confidence: 99%

“…If platelet adhesion to the surfaces of the impeller or pump housing can be prevented by a mechanical method, the antithrombogenicity of a blood pump may be enhanced. Previous studies have reported that mechanical vibration can reduce soil adhesion to a plate . In the same manner, we sought to determine if impeller vibration might prevent platelet adhesion by increasing local shear rates, thereby preventing thrombus formation in a blood pump.…”

Section: Methodsmentioning

confidence: 97%

“…Previous studies have reported that mechanical vibration can reduce soil adhesion to a plate. 24,25 In the same manner, we sought to determine if impeller vibration might prevent platelet adhesion by increasing local shear rates, thereby preventing thrombus formation in a blood pump. This procedure is termed the washout effect in this article.…”

Section: Principle Of the Proposed Thrombus Prevention Methodsmentioning

confidence: 99%

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Mechanical antithrombogenic properties by vibrational excitation of the impeller in a magnetically levitated centrifugal blood pump

Murashige

Hijikata

2019

Artificial Organs

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Mechanical circulatory support devices have been used clinically for patients with heart failure for over 10 years. However, thrombus formation inside blood pumps remains a risk to patient life, causing pump failure and contributing to neurological damage through embolization. In this article, we propose a method for preventing thrombus formation by applying vibrational excitation to the impeller. We evaluate the ability of this method to enhance the antithrombogenic properties of a magnetically levitated centrifugal blood pump and ensure that the impeller vibration does not cause undue hemolysis. First, 3 vibrational conditions were compared using an isolated pump without a mock circulation loop; the vibrational excitation frequencies and amplitudes for the impeller were set to (a) 0 Hz‐0 μm, (b) 70 Hz‐10 μm, and (c) 300 Hz‐2.5 μm. The motor torque was measured to detect thrombus formation and obtain blood coagulation time by calculating the derivative of the torque. Upon thrombus detection, the pump was stopped and thrombi size were evaluated. The results showed an increase in the blood coagulation time and a decrease in the rate of thrombus formation in pumps with the impeller vibration. Second, an in vitro hemolysis test was performed for each vibrational condition to determine the effect of impeller vibration on hemolysis. The results revealed that there was no significant difference in hemolysis levels between each condition. Finally, the selected vibration based on the above test results and the non‐vibration as control were compared to investigate antithrombogenic properties under the continuous flow condition. The blood coagulation time and thrombi size were investigated. As a result, vibrational excitation of the impeller at a frequency of 300 Hz and amplitude of 2.5 μm was found to significantly lengthen clotting time, decreasing the rate of pump thrombus compared to the non‐vibration condition. We indicate the potential of impeller vibration as a novel mechanical antithrombogenic mechanism for rotary blood pumps.

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a_{exc} = \frac{d U_{exc}}{dt} = - {4 π}^{2} f_{exc}^{2} A_{exc} \sin ω_{exc} t .

…”

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 97%

Section: Principle Of the Proposed Thrombus Prevention Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Mechanical antithrombogenic properties by vibrational excitation of the impeller in a magnetically levitated centrifugal blood pump

Murashige

Hijikata

2019

Artificial Organs

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“…2,3 For instance, ultrasonic and mechanical vibration were applied to reduce soil adhesion. [5][6][7] The modification to the furrowed tines by ultra-high molecular weight polyethylene (UHMWPE) coating can reduce draft force significantly, where the draft force of the UHMWPE-coated tine measured 29% less than that of the steel tine. 4 The soil sticky limit was defined as the minimum moisture content where the soil started to show adherence to steel spatula.…”

Section: Introductionmentioning

confidence: 99%

Biomimetic functional surface of reducing soil adhesion on 65Mn steel

Jin

et al. 2019

Advances in Mechanical Engineering

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The phenomenon of soil adhesion occurs when soil-tillage implements interact with soil, which often increases the working resistance and energy consumption. It was found that the membranous leaf sheath of rhizoma imperatae can shuttle in soil, owing to not only its own growth force, but also the anti-adhesion function due to the hydrophobicity and special surface texture. In this article, the microstructure and surface wettability of membranous leaf sheath were studied to reveal its anti-adhesion property by testing. The anti-adhesion mechanism of the hydrophobic surface for the static and dynamic state was analyzed. The biomimetic specimens were designed and fabricated using 65Mn steel inspired by membrane leaf sheaths. The hydrophobic surface was obtained on 65Mn steel by the low free energy modification with myristic acid ethanol solution. For comparison, a 65Mn steel sample without modification was also prepared. A linear soil bin filled with clayey soil with the compaction and gravimetric moisture content of 24.5% dry base was constructed to test the soil anti-adhesion properties of biomimetic specimens. In fixed compacted soil with 24.5% moisture content, the weight of adhesive soil on the modified biomimetic surface measured 50% less than that of the control specimens flat plate surface with modification and NO. 10.

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“…provides freedom of relative displacement of phase surfaces and can be liquid, solid and gaseous. The thickness of the layer must be determined for its anti-adhesion properties [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Decrease of soil adhesion to working bodies of earth-moving machines

Zenkov¹,

Balahonov²,

Кириченко³

2018

Proceedings of the International Conference "Aviamechanical Engineering and Transport" (AVENT 2018)

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When the moist soil is excavated, the soil sticking and freezing to the working units of the earth-moving machines take place. It is the phenomenon that considerably reduces the plant`s efficiency. There are four main groups of methods intended for eliminating adhesion of soil to the surface of the working bodies of earth-moving machines. As for the nature and the operating effects of the methods, they can be divided into the preventive methods and the means ones for cleaning the working units of the earth-moving machines. On the special shear stand, the multifactorial test has been conducted using mathematical theory of experiment to determine the practical effect of antiicing liquid usage as a preventive method when the intermediate layer is used in the contact point "soil-to-working units" to reduce adhesion to metal surfaces soil machines. Mathematical processing of the obtained results was carried out using the MODEL program for multifactor dependencies using the least squares method. As a result of the processing of experimental data, regression equations were obtained without the action of the lubricant and with the use of anti-icing fluids "MAXFLIGHT 04" and "OCTAFLO EG". Multifactorial dependences of shear stress are obtained. To interpret the results obtained, quasi-onefactor dependences are given for fixed values of two factors among three, the response surfaces for quasi-one-factor dependencies for anti-icing fluids of the brands MAXFLIGTH 04 and OCTAFLO EG are constructed. Analysis of these dependencies in the investigated range of factor changes shows that the use of anti-icing fluids of the brands MAXFLIGTH 04 and OCTAFLO EG reduces the shear stress to 60%.

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Study on use of vibration to reduce soil adhesion

Cited by 34 publications

References 2 publications

Mechanical antithrombogenic properties by vibrational excitation of the impeller in a magnetically levitated centrifugal blood pump

Mechanical antithrombogenic properties by vibrational excitation of the impeller in a magnetically levitated centrifugal blood pump

Biomimetic functional surface of reducing soil adhesion on 65Mn steel

Decrease of soil adhesion to working bodies of earth-moving machines

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