Department of Mechanical engineering
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Item Experimental study on helical propulsion system of artificial nanoswimmer: Low reynolds number(IEEE, 2017) Rathore, Jitendra S.Development in the field of nanotechnology makes possible the production of nanorobots and its usage inside the human body for various biomedical applications. Introducing a nanorobot inside a human body faces various challenges. One of the major challenges is its propulsion mechanism. Since the flow regime is of low Reynolds number, normal propulsion systems would find itself impossible to produce net forward thrust in such media. A rigid helix is found to produce thrust force and is a perfect place to start with in low Reynolds number propulsion. In this paper, a set of helical flagella has been fabricated in macro domain and the effect of change of wavelength, wire diameter and helix diameter is investigated on the thrust force produced by rigid helical filament using Resistive Force Theory.Item Design and analysis of helical flagella propelled nanorobots(IEEE, 2009) Rathore, Jitendra S.Advancement in the field of nanorobotics has been facilitated by the current advances in nano-bio-technology and nanofabrication methods. The important uses of nanorobots are in advancing medical technology, healthcare and environment monitoring. In bio-medical applications, nanorobots need to swim in biological fluids flowing in narrow channels of few hundred nanometer size. The dominating effects in nanometer size domains are increased apparent viscosity and which makes the design of a propulsion mechanism a challenging task. Micro and nano size biological organisms move by generating planar waves or rotating helical flagella. In the present work, design of propulsion with helical flagella is proposed and a generalized analytical model is developed, simulated and discussed. The performance parameters of the developed model viz. velocity and efficiency have been computed based on resistive force theory and compared with those of the model available in literature. Improved performance, feasibility and generality of the developed flagellar model have been discussed.Item Nanorobot Propulsion Using Helical Elastic Filaments at Low Reynolds Numbers(ASME, 2011-02) Rathore, Jitendra S.Swimming in micro/nano domains is a challenge and involves a departure from standard methods of propulsion, which are effective at macrodomains. Flagella based propulsion is seen extensively in nature and has been proposed as a means of propelling nanorobots. Natural flagella actively consume energy in order to generate bending moments that sustain constant or increasing amplitude along their length. However, for man-made applications fabricating passive elastic filaments to function as flagella is more feasible. Of the two methods of flagellar propulsion, namely, planar wave and helical wave, the former has been studied from a passive filament point of view, whereas the latter is largely unexplored. In the present work an elastohydrodynamic model of the filament has been created and the same is used to obtain the steady state shape of an elastic filament driven in a Stokes flow regime. A modified resistive force theory, which is very effective in predicting propulsion parameters for a given shape, is used to study the propulsive dynamics of such a filament. The effect of boundary conditions of the filament on determining its final shape and propulsive characteristics are investigated. Optimization of physical parameters is carried out for each of the boundary conditions considered. The same are compared with the planar wave model.Item Engineering Nanorobots: Chronology of Modeling Flagellar Propulsion(ASME, 2010-06) Rathore, Jitendra S.Nanorobots are propitious to swim or fly compared with crawling and walking because of issues with desirable characteristics of high velocity, efficiency, specificity, controllability, and a simple propagation mechanism that can be realized with miniaturized parts. Inspired by the fact that microorganisms existing in nature function expeditiously under these circumstances, researchers have shown a great interest to conceptualize, model, analyze, and make micro-/nanosized swimmers (nanorobots) that can move in body fluids for applications such as targeted drug delivery, nanomedication, and in-viscera nanosurgery. The present work compiles modeling of physics as investigated since 1951 of flagellar propulsion in engineering nanorobots. Existing theories in flagellar propulsion such as resistive force theory, slender body theory, Kirchhoff rod theory, bead model, and boundary element method as well as progress in designing the propulsion system of a nanorobot are summarized, and various interdisciplinary aspects of realizing nanorobots and issues in moving nanorobots have been presented chronologically.