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Chaitanya Vijay

Bio: Chaitanya Vijay is an academic researcher from Indian Institute of Technology Madras. The author has contributed to research in topics: Propellant & Ammonium perchlorate. The author has an hindex of 5, co-authored 11 publications receiving 69 citations.

Papers
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Journal ArticleDOI
TL;DR: In this article, the authors demonstrate the feasibility of a technique to embed the catalyst on ammonium perchlorate (AP) surface, in aluminized composite solid propellants.

32 citations

Journal ArticleDOI
TL;DR: In this paper, a random packing algorithm is used to generate a three-dimensional propellant pack consisting of spherical Ammonium perchlorate (AP) particles and Hydroxyl-terminated poly butadiene (HTPB) binder.

18 citations

Journal ArticleDOI
TL;DR: In this paper, the combustion characteristics of ammonium perchlorate (AP) monopropellant have been revisited and a new burn rate law for pure AP was obtained for conditions close to adiabatic, which completely changed the understanding of AP combustion and called for a new set of parameters to be developed to predict the results obtained with silica grease on the sides.

14 citations

Journal ArticleDOI
TL;DR: In this article, the authors evaluate the thermal conductivity of a wide range of composite solid propellants using a numerically developed finite volume model, and a simulated propellant pack is constructed using a random packing method, assuming particles as spheres.

10 citations

Journal ArticleDOI
01 Jan 2019
TL;DR: In this article, a novel technique to quantify binder melt on the surface of the propellant was developed to evaluate the effect of binder melting on the performance of non-aluminized AP-HTPB propellants of 86% particulate loading.
Abstract: The present study reports the development of a novel technique to quantify binder melt on the surface of the propellant. Non-aluminized AP-HTPB propellants of 86% particulate loading are used to illustrate the technique. Elemental maps of unburnt and extinguished propellant surface are obtained using EDS (Energy Dispersive Spectroscopy). Overlap between the elements is identified and the elemental maps are processed to calculate AP and binder area exposed in unburnt and extinguished samples. The AP area exposed is found to be around 72.3% and 63.3% for unburnt and extinguished samples, respectively, indicating a reduction in AP exposed area with extinguished samples. This has been attributed to the binder melt discussed in literature but never quantified. Simulations have been carried out to analyze and understand the effects of this binder melt. A random packing algorithm is used to simulate propellant packs. Also, a methodology to account for binder melt layer is introduced and is used to capture AP exposed areas. Effect of binder melt in propellants with different solid loading and varying particle size is discussed. It is shown that fine AP particles are more prone to being covered by binder melt than the coarse AP particles. A possible explanation to the behavior of plateau burning propellants observed in literature has been provided through this analysis.

10 citations


Cited by
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Journal ArticleDOI
15 Oct 2019-Fuel
TL;DR: In this paper, the authors review the critical physical processes of ammonium perchlorate (AP) propellant combustion and explore the different experimental and computational avenues used to shed light on such a complex phenomenon.

78 citations

Journal ArticleDOI
TL;DR: In this article, the substitution of aluminum particles with metallic alloys in order to reduce agglomeration in aluminized propellants was investigated, and a qualitative phenomenological mechanism was proposed based on a competition among four distinct effects: the metal melting temperature, the adhesive force of the aggloomerates, the propellant burning rate, and micro-explosions.

57 citations

Journal ArticleDOI
TL;DR: In this article, a new micromechanical formulation based on a unit cell model is developed to predict the effective thermal conductivities of carbon nanotube (CNT)-shape memory polymer (SMP) nanocomposites.
Abstract: A new micromechanical formulation based on a unit cell model is developed to predict the effective thermal conductivities of carbon nanotube (CNT)-shape memory polymer (SMP) nanocomposites. Model predictions considering interfacial thermal resistance between the CNT and SMP, agglomerated state of CNTs into the SMP matrix and CNT non-straight shape are in reasonable agreement with the experiment reported in the literature. It is found that the CNT agglomeration must be removed to obtain a maximum level of thermal conductivities of SMP nanocomposites. The effects of volume fraction, diameter, cross-section shape, arrangement type and waviness factors of CNTs as well as interfacial thermal resistance on the axial and transverse thermal conductivities of aligned CNT-reinforced SMP nanocomposites are extensively investigated. The results show that the alignment of CNTs into the SMP nanocomposites along the thermal loading can be an efficient way to dissipate the heat. When the CNT waviness increases, a nonlinear decrease in the axial thermal conductivity is occurred, however, the nanocomposite thermal conductivity along the transverse direction quickly rises. It is observed that the interfacial thermal resistance, cross-section shape and arrangement type of CNTs do not affect the axial thermal conductivity of CNT-SMP nanocomposites. But, the interfacial thermal resistance can play a key role in the transverse nanocomposite thermal conductivity. The present fundamental study is very important for understanding the thermal conducting behavior of CNT-SMP nanocomposites which may have a wide range of applications in temperature sensing elements and biological micro-electro-mechanical systems.

51 citations

Journal ArticleDOI
15 Mar 2021
TL;DR: Nanocellulose has been identified as a super versatile material that will become a replacement material for many applications including in the military as discussed by the authors, and it has been shown that it can be synthesized from discarded fibers left over from forestry and agricultural waste that can be transformed into high value products.
Abstract: Military systems have become more complex, and the development of future advanced materials for defence applications has received much attention. Nanocellulose has been identified as a ‘super versatile material’ that will become a replacement material for many applications including in the military. Nanocellulose can be synthesized from discarded fibers that are left over from forestry and agricultural waste that can be transformed into high-value products. Thanks to its interesting properties, comprising low thermal expansion coefficient, high aspect ratio, high crystallinity, and good mechanical and optical properties, nanocellulose has emerged as a new material class for high end military products such as bulletproof vests, fire-retardant materials, as a component of propellants and filtration materials, and in textile, electronic and energy products. Therefore, in this review, current and future applications of nanocellulose in the military are critically discussed. This review is intended to impart to readers some of the excitement that currently surrounds nanocellulose research, and it's fascinating chemical and physical properties and applications in the military.

48 citations

Journal ArticleDOI
TL;DR: In this paper, the effects of packing structure on heat transfer in granular media are evaluated at macro-and grain-scales, and a gas-solid coupling heat transfer model is adapted into a discrete-element-method to simulate this transport phenomenon.

46 citations