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Mannoor, Madhusoodanan,Kang, Sangmo,Suh, Yong Kweon Hindawi Limited 2015 Advances in condensed matter physics Vol.2015 No.-
<P>Molecular dynamics simulation of self-assembly of surfactant span80 molecules to form reverse micelles in nonpolar liquid dodecane is carried out. Simulations are performed using a united atom model for dodecane and a hybrid model for span80 molecules. Various physical characteristics of reverse micelle are measured, and the same are compared with available experimental results. Presence of charge carriers in the form of solvated ions in the core of reverse micelles is confirmed by the simulation. Movement of reverse micelles under the effect of uniform external electric field is also discussed.</P>
Sangmo Kang,Madhusoodanan Mannoor,Ranjith Maniyeri 대한기계학회 2016 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.30 No.7
This paper presents two-dimensional direct numerical simulations to explore the effect of the Reynolds number on the Dielectrophoretic (DEP) motion of a pair of freely suspended particles in an unbounded viscous fluid under an external uniform electric field. Accordingly, the electric potential is obtained by solving the Maxwell’s equation with a great sudden change in the electric conductivity at the particle-fluid interface and then the Maxwell stress tensor is integrated to determine the DEP force exerted on each particle. The fluid flow and particle movement, on the other hand, are predicted by solving the continuity and Navier-Stokes equations together with the kinetic equations. Numerical simulations are carried out using a finite volume approach, composed of a sharp interface method for the electric potential and a direct-forcing immersed-boundary method for the fluid flow. Through the simulations, it is found that both particles with the same sign of the conductivity revolve and eventually align themselves in a line with the electric field. With different signs, to the contrary, they revolve in the reverse way and eventually become lined up at a right angle with the electric field. The DEP motion also depends significantly on the Reynolds number defined based on the external electric field for all the combinations of the conductivity signs. When the Reynolds number is approximately below Re cr » 0.1, the DEP motion becomes independent of the Reynolds number and thus can be exactly predicted by the no-inertia solver that neglects all the inertial and convective effects. With increasing Reynolds number above the critical number, on the other hand, the particles trace larger trajectories and thus take longer time during their revolution to the eventual in-line alignment.
R. SivaSankari,U. Madhusoodanan,V. Sridharan,Rabindranath Bhowmik,Rajesh Narayana Perumal 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.5
Single crystal of tri glycine sulphate has been grown in the presence and absence of L-glutamic acid and sodium sulphate by slow evaporation growth. The grown crystal was analyzed by single crystal X-ray diffraction. FTIR studies were used to confirm the presence of functional groups present in the grown crystals. The optical absorbance studies show the cut off wavelength to be 235 nm. The phase transition temperature was found to be 50 8C from DSC analysis. The dielectric behavior was identified. The AC conductance of the grown crystal was plotted. PE loop measurement is taken.
Numerical comparative study on the performance of open photoacoustic cells
조슈아 페르난데스,Sangmo Kang,Madhusoodanan Mannoor 대한기계학회 2021 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.35 No.4
An open photoacoustic cell has the merit of not having to frequently disassemble and reassemble to fill up with the gas, compared to the closed counterpart, whereas it has the demerit of causing acoustic radiation losses through the openings. In this paper, we have performed numerical simulations on three different types of open photoacoustic cells, H-type and T-type resonant cells and Helmholtz cell, made by attaching a couple of pipeshaped extensions to both openings with the intent to lessen the acoustic losses and simultaneously understand the geometrical effect of the opening extensions on their performance. For the numerical study, the perturbed forms of the continuity equation, NavierStokes equation, energy equation, and equation of state are solved for the quality factor, acoustic pressure and resonance frequency to evaluate the performance. To predict the acoustic losses through the openings, the computational domain for the measurement of acoustic pressure is extended out of the cells. Results show that the geometrical effect of the opening extensions on the performance varies greatly with the type of open cell. In particular, the H-type open cell is the most desirable choice among the three types because of its high acoustic pressure response and enhanced quality factor. We believe that the results of this study would help us select the right type of open cell required for various practical applications.
Suresh Alapati,제우성,Madhusoodanan Mannoor,Yong Kweon Suh 한국물리학회 2016 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.68 No.11
In this paper, we present the results obtained from the simulation of particle motion induced by the fluid flow driven by an array of beating artificial cilia inside a micro-channel. A worm-like-chain model is used to simulate the elastic cilia, and the lattice Boltzmann equation is used to compute the fluid flow. We employ a harmonic force at the extreme tip of each cilium to actuate it. Our simulation methods are first validated by applying them to the motion of a single cilium and a freely falling sphere. After validation, we simulate the fluid flow generated by an array of beating cilia and find that a maximum flow rate is achieved at an optimum sperm number. Next, we simulate the motion of a neutrally buoyant spherical particle at this optimum sperm number by tracking the particle motion with a smoothed profile method. We address the effect of the following parameters on the particle velocity: the gap between cilia and particle, the particle size, the cilia density, and the presence of an array of intermediate particles.