Mechanical Behavior of a Bi-Layer Cantilever Micro-Beam Subjected to Electrostatic Force, Mechanical Shock and Thermal Moment

Rezazadeh, Ghader; Pashapour, M.; Abdolkarimzadeh, Fatemeh

doi:10.1142/s1758825111001123

Cited by 19 publications

(4 citation statements)

References 33 publications

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“…If both the cylinders are fixed, equation (20) reduces to the dispersion relation of Awasthi et al 28 Equation ( 20) can be written in non-dimensional form by taking characteristic velocity U and h = r o À r i as characteristic length.…”

Section: Perturbed Statementioning

confidence: 99%

“…Typically, the examination of interfacial instability between two fluids separated by an interface is conducted without the consideration of heat and mass transfer across said interface. Rezazadeh et al 20 studied the static and dynamic behavior of a bi-layer cantilever micro-beam and identified its pull-in instability in the presence of thermal moment, electrostatic force, and mechanical shock effects. The dynamics of mass and heat transmission over the interface play a crucial role in various scenarios, ranging from boiling heat transfer in chemical engineering to geophysical challenges.…”

Section: Introductionmentioning

confidence: 99%

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Impact of swirling on capillary instability of Walter’s B viscoelastic fluid-viscous fluid interface with heat and mass transfer

Srija,

Singh,

Awasthi

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part C:

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The multifaceted applications of swirling interfaces featuring heat and mass transfer extend across diverse industries, encompassing energy, manufacturing, healthcare, and environmental protection. The present study is concerned with examining the swirling impact on the capillary instability occurring at the interface between a Walter’s B viscoelastic fluid and a viscous fluid, under the influence of heat and mass transfer. The setup consists of two rigid cylinders that form an annular region filled with viscous fluid on the inner side and Walter’s B viscoelastic fluid on the outer side. The outer cylinder rotates at a constant angular velocity, while the inner cylinder remains stationary. The study employs the Walter’s B viscoelastic model, which conforms to the potential flow theory for viscoelastic fluids. The proposed flow theory disregards tangential stresses and balances the difference in normal viscous stresses with the surface force at the free boundary. The perturbed equations yield a quadratic equation in growth rate, which is numerically analyzed. The results show that heat and mass transfer enhance the interface’s stability and swirling makes it more stable. Moreover, it is noteworthy that the Weber number exerts a stabilizing influence on the interface, while the density ratio also plays a role in promoting its stability. The centrifuge number exhibits a counteractive effect by impeding interface growth, thus contributing to its stabilization.

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Section: Perturbed Statementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Impact of swirling on capillary instability of Walter’s B viscoelastic fluid-viscous fluid interface with heat and mass transfer

Srija,

Singh,

Awasthi

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part C:

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show abstract

“…These tests are usually conducted for strain rates in the range between 10 −6 to 10 3 s −1 . The strain rate effect is especially vital because the interactions at nanometre scale, such as during the interaction of nano-particles Liang et al, 2016], are more violent due to local thermal shocks [Rezazadeh et al, 2011;Xiong and Tian, 2011] or strong mechanical collision [Mochalin et al, 2012] of particles. Development of the testing schemes at higher strain rates and smaller scales will benefit the advance of science in these fields.…”

Section: Introductionmentioning

confidence: 99%

Nano-Impact Tests with Ultra-High Strain Rate Loading Using Graphene and Ion Impact

Chen

Yao

et al. 2016

Int. J. Appl. Mechanics

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Strain rate is essential in study of the physics of fluids and solids undergoing deformation. State-of-art high strain rate tests have mainly been in macro-scale with an upper limit of [Formula: see text]. A graphene-based layered system is proposed to conduct nanometer-scale high strain rate testing. The process is investigated by molecular dynamics simulations. Accelerated single ion or group of ions are used to impact on the proposed system to generate ballistic or plate-like impact scenarios. The effects of impact energy, shape of impact absorber and the impaction location are investigated. The graphene layer is the key of the proposed system to spread the load and protect the sample. The results indicate that ion group and single ion impacts produce strain rates of [Formula: see text]–[Formula: see text] and [Formula: see text]–[Formula: see text], respectively. Ion group impact produces a more significant signal than single ion impact on the sensing nano-layer in the system. The ultimate strength of an Al-Cu alloy sample during ion impact is estimated to be 215[Formula: see text]MPa to 251[Formula: see text]MPa, significantly lower than predicted by the Johnson–Cook model because of the rapidly increased temperature and melting in the sample. The results demonstrate new possibilities for understanding high strain rate effects at nano-scale.

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“…They have selected a specific material model and the theory is implemented in a finite element code. Rezazadeh et al [2011] have studied the static and dynamic behavior of a bi-layer cantilever micro-beam and its pull-in instability subjected to simultaneous effects of thermal moment, electrostatic force and mechanical shock.…”

Section: Introductionmentioning

confidence: 99%

Study on Electrohydrodynamic Capillary Instability of Viscoelastic Fluids in Presence of Axial Electric Field

Tiwari

Awasthi

Agrawal

2012

Int. J. Appl. Mechanics

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Linear viscoelastic potential flow analysis of capillary instability in presence of axial electric field has been studied. A dispersion relation is derived for the case of axially imposed electric field and stability is discussed in terms of various parameters such as electric field, Deborah number, Ohnesorge number, permittivity ratio and conductivity ratio etc. Stability criterion is given in the terms of critical value of wave number as well as critical value of applied electric field. The system is unstable when electric field is less than the critical value of electric field, otherwise it is stable. It has been found that in presence of the electric field the growth rates for viscoelastic fluid are higher than viscous fluid. Various graphs have been plotted for growth rate and critical electric field.

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Mechanical Behavior of a Bi-Layer Cantilever Micro-Beam Subjected to Electrostatic Force, Mechanical Shock and Thermal Moment

Cited by 19 publications

References 33 publications

Impact of swirling on capillary instability of Walter’s B viscoelastic fluid-viscous fluid interface with heat and mass transfer

Impact of swirling on capillary instability of Walter’s B viscoelastic fluid-viscous fluid interface with heat and mass transfer

Nano-Impact Tests with Ultra-High Strain Rate Loading Using Graphene and Ion Impact

Study on Electrohydrodynamic Capillary Instability of Viscoelastic Fluids in Presence of Axial Electric Field

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