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Search Results: 1 - 10 of 461580 matches for " Arijit A. Ganguli "
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Bubble Dynamics of a Single Condensing Vapor Bubble from Vertically Heated Wall in Subcooled Pool Boiling System: Experimental Measurements and CFD Simulations
Arijit A. Ganguli,Aniruddha B. Pandit,Jyeshtharaj B. Joshi
International Journal of Chemical Engineering , 2012, DOI: 10.1155/2012/712986
Abstract: Bubble dynamics of a single condensing vapor bubble in a subcooled pool boiling system with a centrally heated cylindrical tank has been studied in the Rayleigh number range 7 . 9 × 1 0 1 2 < R a < 1 . 8 8 × 1 0 1 3 . The heat source in the system is steam condensing inside a vertical tube. The tube was placed in the center of the tank (300?mm i.d., 300?mm height) which is well filled with water. Experimental investigation has been carried out with High Speed Camera while Computational Fluid Dynamics (CFD) investigation has been performed using Volume of Fluid (VOF) method. The heat source has been modeled using simple heat balance. The rise behavior of condensing bubbles (change in size during rise and path tracking) was studied and the CFD model was validated both quantitatively and qualitatively. 1. Introduction Pool boiling is a complex nonlinear dynamic process. The microscopic aspects of boiling process, for example, embryo nucleation and surface roughness determine its nature largely. The microscopic effects eventually exhibit in a macroscopic behavior. Further, boiling is a highly stochastic process and the precise prediction of the location and time of the generation, collapse, coalescence is difficult with the present status of knowledge. The condensation of bubbles in subcooled boiling systems is extremely important for studying the hydrodynamics during subcooled pool boiling. The simple reason for this is that condensation changes the shape and size of the bubbles. When a bubble is formed at the interstitial site in the case of nucleate boiling the bubble grows to a certain diameter and then departs from the interstitial site. As the bubble departs from the nucleation site, it tends to slide along the hot surface and detaches from the surface. The bubble then does not necessarily follow a straight path but moves near or away from the wall. In addition to experimental investigations, Computational Fluid Dynamics (CFD) is useful to obtain better understanding of bubble dynamics. Experimental investigations on dynamics of single vapor bubbles condensing in a subcooled boiling liquid have been carried out by Voloshko and Vurgaft [1] and an analytical model was developed. The authors found the relation between the dynamics of vapor bubble during condensation and intensity of heat exchange at vapor bubble interface. Bubble dynamics of vapor bubbles in subcooled liquids have been investigated (both experimentally and numerically) by researchers [2–9]. Numerical investigations using volume of fluid (VOF) method have been recently carried out by
Problems of skin cover in injuries of lower limb with tissue loss
Ganguli A
Indian Journal of Plastic Surgery , 2007,
Abstract:
Ergonomic interventions to improve work environment in garment manufacturing units
Parimalam Parimalam,Kamalamma N,Ganguli A
Indian Journal of Occupational and Environmental Medicine , 2006,
Abstract: The work environment in the garment manufacturing units is unhealthy and unsafe for the workers, resulting in several health problems. Analysis of garment manufacturing units using a combination of techniques revealed that the congested work area, improper ventilation, dust, unergonomic workstations, excessive noise and non-use of personal protective equipment were the major constraints faced by the workers in these units. Based on the study, interventions to improve the work environment, safety aspects and work methods have been suggested which could be adopted on a wider scale.
Enhancement of Critical Temperature of a Striped Holographic Superconductor
Suman Ganguli,Jimmy A. Hutasoit,George Siopsis
Physics , 2012, DOI: 10.1103/PhysRevD.86.125005
Abstract: We study the interplay between the stripe order and the superconducting order in a strongly coupled striped superconductor using gauge/gravity duality. In particular, we study the effects of inhomogeneity introduced by the stripe order on the superconducting transition temperature beyond the mean field level by including the effects of backreaction onto the spacetime geometry in the dual gravitational picture. We find that inhomogeneity \emph{enhances} the critical temperature relative to its value for the uniform system.
Superconducting Dome from Holography
Suman Ganguli,Jimmy A. Hutasoit,George Siopsis
Physics , 2013, DOI: 10.1103/PhysRevD.87.126003
Abstract: We find a regime in which a strongly coupled striped superconductor features a superconducting dome. This regime is signified by i) a modulating chemical potential that averages to zero, and ii) a superconducting order parameter that has a scaling dimension larger than 3/2 but less than or equal to 3. We also find that in this regime, the order parameter exhibits a mild dependence on the modulation wavelength of the stripe.
Effective Theory of Floquet Topological Transitions
Arijit Kundu,H. A. Fertig,Babak Seradjeh
Physics , 2014, DOI: 10.1103/PhysRevLett.113.236803
Abstract: We develop a theory of topological transitions in a Floquet topological insulator, using graphene irradiated by circularly polarized light as a concrete realization. We demonstrate that a hallmark signature of such transitions in a static system, i.e. metallic bulk transport with conductivity of order $e^2/h$, is substantially suppressed at some Floquet topological transitions in the clean system. We determine the conditions for this suppression analytically and confirm our results in numerical simulations. Remarkably, introducing disorder dramatically enhances this transport by several orders of magnitude.
Floquet-Engineered Valleytronics in Dirac Systems
Arijit Kundu,H. A. Fertig,Babak Seradjeh
Physics , 2015,
Abstract: Valley degrees of freedom offer a potential resource for quantum information processing if they can be effectively controlled. We discuss an optical approach to this problem in which intense light breaks electronic symmetries of a two-dimensional Dirac material. The resulting quasienergy structures may then differ for different valleys, so that the Floquet physics of the system can be exploited to produce highly polarized valley currents. This physics can be utilized to realize a valley valve whose behavior is determined optically. We propose a concrete way to achieve such valleytronics in graphene as well as in a simple model of an inversion-symmetry broken Dirac material. We study the effect numerically and demonstrate its robustness against moderate disorder and small deviations in optical parameters.
Strategic Firm Interaction, Returns to Scale, Environmental Regulation and Ambient Charges in a Cournot Duopoly  [PDF]
Sudhakar Raju, Subhadra Ganguli
Technology and Investment (TI) , 2013, DOI: 10.4236/ti.2013.42014
Abstract:

Environmental regulation under conditions of imperfect competition in the presence of nonpoint sources (NPS) of pollution has not been well analyzed in the literature. This paper models strategic firm interaction and the effect of ambient charges on total NPS pollution in an imperfectly competitive, Cournot type duopoly under constant and decreasing returns to scale (CRTS & DRTS). We identify two distinct and often opposing effects. Under CRTS, the primary effect of a higher ambient charge is to increase pollution abatement (and thus decrease pollution) while the secondary effect is to lower output. Higher pollution abatement and lower output reinforce each other so that a higher ambient charge results in an unambiguous decrease in NPS pollution. Under DRTS, a higher ambient charge decreases output but the effect on abatement is ambiguous. Moreover, the marginal effect of a change in the ambient charge is larger under CRTS than DRTS. Our results indicate that, in general, pollution control mechanisms such as ambient charges tend to be more effective under CRTS.

Microbiological safety of street vended fruit chats in Patiala city
Kumar M,Agarwal D,Ghosh M,Ganguli A
Indian Journal of Medical Microbiology , 2006,
Abstract:
The augmentary effect of intramuscular prostaglandins on ethacridine lactate
Roate Veena,Ananthakrishnan R,Ganguli A,Krishna Usha
Journal of Postgraduate Medicine , 1979,
Abstract: A combination of 100 ml of 0.1% Ethacridine lactate solution and two intra-muscular injections of prostaglandin (300 μg each of I5-Methyl-PGF 2α)was tried for safe termination of pregnancy. It was found that the success rate (88%) with this combination regimen was better than ethacridine lactate alone but a little inferior to prostaglandins alone. Average abortion interval was also less than with ethacridine lactate. However, the combination did not reduce the gastro-intestinal disturbances associated with prostaglandins.
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