Dr. Prashant Pawar - Academia.edu (original) (raw)

Papers by Dr. Prashant Pawar

International Journal of Mechanical and Industrial Engineering

Chain Link assembly is extensively used in the industry, the scope of this paper is to review the... more Chain Link assembly is extensively used in the industry, the scope of this paper is to review the applications in the industry and explore the design considerations that go into the design of the assembly. The paper delves into various application aspects and manufacturing aspects to formulate an idea of the system. Finally Finite Element Analysis (FEA) has been used to conduct shape optimization. Since lot of work has already been done in other components, in this paper the focus has been narrowed down to specific component of outer link. Within the outer link, most dimensions in the industry are parametrically defined, however one dimension, the radius that is in between the inter connecting holes is left to manufacturer convenience. In this paper we assess the impact of this radius on the stress in the system, and see if material saving and consequently efficiency increment is possible.

Conveyor chain drives are one of the primary systems used in industry to transmit power and conve... more Conveyor chain drives are one of the primary systems used in industry to transmit power and convey products. Conveyor chain that suffers from premature elongation due to wear and needs to be replaced on a frequent basis will negatively impact productivity and increase the cost of the operation. Roller conveyor chains are the critical component in sugar mills, paper mill, food processing, fertilizer industry, pharmaceutical industry, cement industry, foundry industry, heat treatment units, coal mines etc. The scope of this paper is to study the behavior of chain strip under tensile loading. In turn it will help in reducing down time and maintenance cost related chain assembly in various above said industries. Today, few literatures on the wear of conveyor chain are available. In this paper we study the analytical, experimental and numerical behavior of strip under tensile loading.

Techno-Societal 2016, 2018

The present work is carried out to study the tribological properties such as wear rate of the spe... more The present work is carried out to study the tribological properties such as wear rate of the specimens. Wear rate shows that for different load conditions wear rate of composites varies. Variation of wear rate at different speeds for varying weight fraction of fly ash at different load of 1–4 kg and speed of 1–3 m/s of wear were investigated.

This study is focused on the stochastic analysis of composite rotor blades with matrix cracking i... more This study is focused on the stochastic analysis of composite rotor blades with matrix cracking in forward flight condition. The effect of matrix cracking and uncertainties are introduced to aeroelastic analysis through the cross-sectional stiffness properties obtained using thin walled beam formulation, which is based on a mixed force and displacement method. Forward flight analysis is carried out using an aeroelastic analysis methodology developed for composite rotor blades based on the finite element method in space and time. The effects of matrix cracking are introduced through the changes in the extension, extensionbending and bending matrices of composites whereas the effect of uncertainties are introduced through the stochastic properties obtained from previous experimental and analytical studies. The stochastic behavior of helicopter hub loads, blade root forces and blade tip responses are obtained for different crack densities. Further, assuming the behavior of progressive ...

Current Science, 2019

The sustainability of a technology can be improved by using a holistic approach. In this study, o... more The sustainability of a technology can be improved by using a holistic approach. In this study, one such approach of implementation is demonstrated using the example of biogas technology. This case study is presented based on implementation experience of biogas technology in an academic campus located in a rural area in India. Though this is a well-known technology, it has not yet become sustainable due to various issues. Components of biogas technology can be categorized into three subgroups as preprocessing, main digester and post-processing. In the preprocessing phase, it is important to consider easily available feeds and their preprocessing to improve the performance of the anaerobic process. The improved design of a preprocessor helps in adopting various types of feeds available resulting into solid waste management. The performance of anaerobic process in the main digester is governed by the design of the digester, standard operating practices and maintenance processes. The appropriate consideration and implementation of these three parameters help in improving the gas production rate and fault tolerance. In the postprocessing phase, biogas and biogas manure need to be processed effectively for economic benefits from the biogas plant. These three processes of biogas technology are considered through holistic approach to improve collective performance and acceptability of the plant. The approach looks into modifications in the existing processes to serve other purposes like solid waste management, improvement in usage of biogas and manure along with inclusion of allied technologies to improve acceptability. Further, design modifications in the main digester are carried out through CFD analysis to improve velocity patterns in the digester with the objective of minimizing the biological faults and maximizing the mixing performance. This study shows how the holistic approach can bring together various interdependent components of a technology for simultaneous modifications.

Advances in Mechanical Engineering, 2017

Micropumps are the most important components of lab-on-a-chip devices, which are becoming popular... more Micropumps are the most important components of lab-on-a-chip devices, which are becoming popular recently due to their enormous advantages. Among the different designs of micropumps, the nozzle–diffuser valveless design is the most preferred one due to simplicity in manufacturing. For the simulation of these pumps, the local fluid–structure interaction modeling is important to get the performance accuracy. To capture fluid–structure interaction accurately, an appropriate selection of the fluid as well as the structural modeling approaches are very essential. It is well known that the polydimethylsiloxane materials behave as a viscoelastic material. However, most of the earlier studies on polydimethylsiloxane micropump modeling have considered polydimethylsiloxane as a linear elastic material. In this article, a nozzle–diffuser-based valveless micropump is modeled using a fluid–structure interaction approach along with a linear viscoelastic model for polydimethylsiloxane. The mechan...

Microfluidic pumps are becoming popular in the lab-on-a-chip (LOC) devices for pumping the fluid ... more Microfluidic pumps are becoming popular in the lab-on-a-chip (LOC) devices for pumping the fluid of very small quantity. In this study, a focus is given on simulating the diffuser/nozzle type of micropump using fluid structure interaction. A detailed shape optimization design of geometric parameters of the nozzle/diffuser micropump was undertaken by using Fluid-structure interaction in COMSOL Multiphysics 5.0. A parametric study was carried out for improving the performance of the pump. Further, a geometry optimization was done to get the desired performance of the pump. The parameters considered in the geometry optimization are the thickness of the diaphragm, nozzle parameters. The effect of the divergence angle, diffuser length, neck width, height of chamber, a diameter of chamber and thickness of diaphragm on flow rate was studied. Using 0.020 N actuating force, the micropump delivers a maximum flow rate of 145 µl/min for 20 Hz excitation frequency at zero back pressure. The pred...

1ST INTERNATIONAL CONFERENCE ON MANUFACTURING, MATERIAL SCIENCE AND ENGINEERING (ICMMSE-2019)

In this paper, Taguchi approach is utilized to determine the optimal design of surface texturing ... more In this paper, Taguchi approach is utilized to determine the optimal design of surface texturing parameters for enhancing the multiple performance characteristics of journal bearing. Numerical runs are carried out as per Taguchi's principle with five input surface texturing related parameters such as dimple depth, major diameter, axial array, angular dimple region, axial spacing between dimples. CFD analysis is conducted by utilizing thin film lubrication flow with cavitation effect using COMSOL Multiphysics 5.0. Besides the load carrying capacity (LCC) and coefficient of friction (COF) are taken as performance characteristics in this investigation. The numerical attempts were conducted with an orthogonal array of L27. It is concluded that, axial array and angular dimple region are most significant parameters to enhance the performance.

Materials Today: Proceedings

Chemical Product and Process Modeling

Purpose A numerical analysis is carried out to study the effect of pin fin geometry on the perfor... more Purpose A numerical analysis is carried out to study the effect of pin fin geometry on the performance of microchannel heat sinks. Design/methodology/approach A three-dimensional numerical analysis is carried out using the conjugate heat transfer module of COMSOL MULTIPHYSICS software. Initially, the study is carried out for a microchannel heat sink with elliptical pin fins of 500 µm fin height, and the results of the same are validated with the results obtained from the literature. Further, the effect of different pin fin shapes and pin fin heights is investigated in terms of Nusselt number and pressure drop. The analysis is carried out with different pin fin shapes viz. ellipse, circle, square and hexagon. The pin fin height for all channels is varied from 300 µm to 700 µm. The total surface area of the channel coming into contact with coolant is kept constant for different coolant inflow velocities. Findings Higher values of Nusselt numbers are obtained for fin pins at larger hei...

Current Science, 2017

The objective of rapid development of rural population in a sustainable manner with a view to bri... more The objective of rapid development of rural population in a sustainable manner with a view to bridging the urban-rural divide would require leveraging knowledge and technology in an environment conducive for innovation. The concept of a CILLAGE that incorporates the best of a city in a village is developed with this objective in mind. A CILLAGE is a knowledge-based ecosystem for integrated education, research, technology development and deployment as well as capacity building in rural areas. The focus of research work at a CILLAGE is on regional problems. CILLAGE activities also include a comprehensive engagement with people in the neighbourhood for demonstration and deployment of relevant technologies through a number of Advanced Knowledge-based Rural Technology Initiative (AKRUTI) centres located in the neighbourhood. CILLAGE should thus become a centre of innovation in rural areas to solve the problems of the region and disseminate the developed technologies in the region through AKRUTI centres. This article discusses the philosophy of the CILLAGE concept and describes its implementation through an example.

Computer Methods in Applied Mechanics and Engineering, Apr 1, 2003

Structural damage detection is an inverse problem of structural engineering having three main par... more Structural damage detection is an inverse problem of structural engineering having three main parts: finding the existence, location and extent of damage. In this study, a genetic fuzzy system is used to find the location and extent of damage. A finite element model of a cantilever ...

Journal of Aircraft, May 22, 2012

In this study, an assessment is made to quantify the influence of random material properties and ... more In this study, an assessment is made to quantify the influence of random material properties and fabrication/ manufacturing uncertainties on the aeroelastic response and hub vibratory loads of composite rotor blades. The random variables include lamina stiffness properties, ply ...

Journal of Aircraft, 2007

Journal of Renewable and Sustainable Energy, 2015

Aircraft Engineering and Aerospace Technology, 2015

IOSR Journal of Mechanical and Civil Engineering, 2012

In present paper static analysis of thin walled composite beam with rectangular cell carried out.... more In present paper static analysis of thin walled composite beam with rectangular cell carried out. This beam modeled using 3D finite element method of thin walled composite beams. Different ply orientations are get selected for each face of the rectangular box beam. The numerical results obtained for thin-walled composite box beams under vertical load to investigate the effect of shear deformation is get analyzed with the finite element model. Thin walled composite box beam is modeled so as weight optimization achieved.