Author
R. Sivaiah
Bio: R. Sivaiah is an academic researcher from VIT University. The author has contributed to research in topics: Reynolds number & Newtonian fluid. The author has an hindex of 1, co-authored 3 publications receiving 3 citations.
Papers
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01 Nov 2017TL;DR: In this article, the peristaltic transport of a conducting Newtonian fluid bounded by permeable walls with suction and injection moving with constant velocity of the wave in the wave frame of reference under the consideration of long wavelength and low Reynolds number was investigated.
Abstract: In this paper, we investigate the peristaltic transport of a conducting Newtonian fluid bounded by permeable walls with suction and injection moving with constant velocity of the wave in the wave frame of reference under the consideration of long wavelength and low Reynolds number. The analytical solution for the velocity field, pressure gradient and the frictional force are obtained. The effect of suction/injection parameter, amplitude ratio and the permeability parameter including slip on the flow quantities are discussed graphically. It is found that the greater the suction/injection parameter, the smaller the pressure rise against the pump works. Further, the pressure rise increases with increasing Magnetic parameter.
3 citations
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01 Jan 2021TL;DR: In this article, the authors analyzed the rotation and hall current effects on hemodynamic physiological Jeffery fluid through a tapered channel with porous medium and found that the velocity of the fluid enhances when the hall current parameter is increased.
Abstract: The aim of this research is to analyze the rotation and hall current effects on hemodynamic physiological Jeffery fluid through a tapered channel with porous medium. The pressure rise, velocity, pressure gradient, and frictional force are discussed analytically. An influence of varied governing parameters was illustrated diagrammatically with a set of figures. We identified that as we increase the rotation parameters, the velocity decreases. The velocity of the fluid enhances when we increase hall current parameter. We observed an increase in pumping rate in the retrograde pumping zone, the peristaltic pumping zone, the free pumping zone, and the co-pumping zone, pumping rate decreases when \(\overline{Q} > 3\) by an increase in rotation parameter.
1 citations
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01 Jan 2019TL;DR: In this article, the authors extended the flow of a Jeffrey fluid to include a Newtonian fluid through a vertical symmetric channel with peristalsis under the assumptions of long wavelength and small Reynolds number.
Abstract: The flow of a Jeffrey fluid is extended to include a Newtonian fluid through a vertical symmetric channel with peristalsis under the assumptions of long wavelength and small Reynolds number. The model is applicable to study the behavior in physiological systems. The velocity field, stream function, interface shape, pressure rise (drop), and frictional force at the wall over a cycle of wavelength are obtained, and the results are shown graphically. It is observed that the variation of interface shape yields the thinner peripheral region in the dilated region with increasing Jeffrey parameter λ1 and thicker peripheral region in the dilated region for low viscosity ratio.
1 citations
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TL;DR: Bastion is proposed, a novel and efficient scheme that guarantees data confidentiality even if the encryption key is leaked and the adversary has access to almost all ciphertext blocks.
Abstract: Recent surveys reveals a powerful attacker which breaks data confidentiality by acquiring cryptographic keys, by means of coercion or backdoors in cryptographic software. Once the encryption key is exposed, the only viable measure to preserve data confidentiality is to limit the attacker’s access to the ciphertext. Nevertheless, if data is encrypted with existing schemes, an adversary equipped with the encryption key, can still compromise a single server and decrypt the ciphertext blocks stored therein. In this paper, we study data confidentiality against an adversary which knows the encryption key and has access to a large fraction of the ciphertext blocks. To this end, we propose Bastion, a novel and efficient scheme that guarantees data confidentiality even if the encryption key is leaked and the adversary has access to almost all ciphertext blocks[8]. Index terms – Data Confidentiality, Key exposure, dispersed storage.
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TL;DR: In this article , the influence of heat and mass transfer on the magneto-hydrodynamic Jeffrey fluid peristaltic flow filling porous space in a symmetric inclined channel using a rotating frame with chemical reaction was investigated.
Abstract: This paper provides a rudimentary insight into the influence of heat and mass transfer on the magneto-hydrodynamic (MHD) Jeffrey fluid peristaltic flow filling porous space in a symmetric inclined channel using a rotating frame with chemical reaction. In contrast to previous attempts, the flow formulation is based on the impact of a modified Darcy's law porous media on the Jeffrey fluid condition. The derived equations were solved analytically via the standard long wavelength and low Reynolds number assumptions to determine the pressure gradient, temperature, dimensionless velocity, pressure rise, and friction force. Otherwise, the concentration was numerically processed using the ND-Solve built-in command of Mathematica. Such a numerical technique is beneficial in minimizing error and reducing CPU time per evaluation. It chooses an appropriate algorithm for solving the problem. The graph is used to physically interpret the numerical answers for the base flow profiles. For numerous parameters of interest that enter into the issues, graphical findings are developed and tested. The impacts of various involved parameters appearing in the solutions are carefully analyzed. The trapping phenomena are discussed for several parameters. Electromagnetic peristaltic micropumps, for example, are one application of the current study in biomedical engineering. It was claimed that our systematic approach may constitute a basis for accurately examining the impact of heat and mass transfer on the magneto-hydrodynamic (MHD) Jeffrey fluid peristaltic flow filling porous space in a symmetric inclined channel using a rotating frame with chemical reaction, useful for diverse medical applications such as gastric fluid flow through the small intestine.
9 citations
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01 Dec 2020
8 citations
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01 Sep 2019
3 citations
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TL;DR: In this article , the peristaltic flow of Jeffrey fluid through a porous wall channel is discussed in the presence of activation energy and constant heat source/sink effects, and a chemical reaction is also part of the analysis.
Abstract: Abstract The current study discusses the peristaltic flow of Jeffrey fluid through a porous wall channel. Magnetohydrodynamic (MHD) effects are also considered while formulating the problem. Heat and mass transfers are discussed in the presence of activation energy and constant heat source/sink effects. A chemical reaction is also part of the analysis. The Lubrication approach is adopted for the simplification of resulting non-linear equations. MATHEMATICA command, NDSolve, is used to discuss the results graphically for various flow parameters like Hartman number $$(M)$$ ( M ) , porosity parameter $$(k)$$ ( k ) , slip parameters ( $$\gamma ,{\gamma }_{1},{\gamma }_{2}$$ γ , γ 1 , γ 2 ), Schmidt $$(Sc)$$ ( S c ) , Soret $$(Sr)$$ ( S r ) and Prandtl $$(Pr)$$ ( P r ) numbers, and many others. Parabolic behavior for velocity and sinusoidal nature for heat transfer and pressure gradient is noticed. Results indicate that the velocity is greatly affected by varying values of slip parameters ( γ ′ s ) and Hartman number $$(H)$$ ( H ) . Enhancing the viscoelastic nature of fluid causes an increase in velocity. Similar behavior is noticed for velocity and temperature profiles. The decreasing trend is shown by concentration when the value of the chemical reaction and temperature ratio parameters is enhanced. Thus, the study presented in the current analysis can be used to study many human physiological systems especially, the blood flow. Since Jeffrey's fluid exhibits the same characteristics as observed for blood.
3 citations
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01 Jan 2020TL;DR: In this article, the peristaltic transport of a Newtonian fluid with heat transfer in a vertical porous axisymmetric tube under long-wavelength approximation is considered and closed-form solution is obtained as an asymptotic expansion in terms of porosity and free convection parameters.
Abstract: Peristaltic transport of a Newtonian fluid, with heat transfer, in a vertical porous axisymmetric tube under long-wavelength approximation is considered. Closed-form solution is obtained as an asymptotic expansion in terms of porosity and free convection parameters. Expressions, for velocity, temperature, coefficient of heat transfer and pressure–flow relationship at the boundary wall of the tube, are derived. It is observed that pressure drop increases as amplitude ratio increases. Further, it has been observed that for some specific values of different parameters under consideration, the mean flux significantly increases by about 8–10% as Grashof number increases from 1 to 2. This relates to optimization of heat transfer in certain processes.
1 citations