(SoE) School of Engineering

<p>Shiv Nadar University is a comprehensive, multidisciplinary, research-focused, and student-centric University offering a full range of academic programs at the undergraduate, postgraduate and doctoral level. With state-of-the-art infrastructure, the University comprises of academic wings, sophisticated labs, international standard sports facilities, amphitheaters, auditorium, conference rooms and smart classrooms. The University&rsquo;s goal is to become internationally recognized for the quality of its research and creative endeavors and their applicability to improving quality of life, generating new insights and expanding the boundaries of human knowledge creativity. Committed to excellence in teaching, research and service, the University aims to serve the higher education needs of India and the world beyond.</p>

Shiv Nadar University

A novel concept of rotating circular ribs as artificial roughness has been employed within a two-dimensional rectangular duct to understand their effects on heat transfer and air flow characteristics using CFD. The effects of design parameters such as roughness height, roughness pitch, relative roughness height, relative roughness pitch, and rotational speed of the circular rib are simulated for Reynolds number ranging from 3800 to 18,000 under solar air heater boundary conditions. 54% increase in Nusselt number is observed for rib height of 1.4 mm, pitch of 10 mm, circular rib rotation of 10000 rpm at Re = 3800 as compared with fixed ribs. The maximum thermo-hydraulic performance factor of 1.57 is achieved at Reynolds number of 3800 for the circular ribs—relative roughness height of 0.042 and relative roughness pitch of 25— rotating counter to flow with 10000 rpm. For a given rotational speed of the circular ribs, thermo-hydraulic performance factor decreases at higher flow velocities. Significant increase in Nusselt number with rotating ribs as artificial roughness establishes the potential of this novel approach for solar air heaters. © 2021 Elsevier Ltd

World University root node

Mechanical Engineering

Sustainable Energy Technologies and Assessments

Thermal performance evaluation of a solar air heater with rotating turbulators

Linear vibratory feeders and vibratory bowl feeders are widely used as part feeders in mass production industries. Making the helical track of the bowl feeder requires special tooling. This makes it expensive to adapt to product changes. Linear feeders are simpler in construction and relatively flexible enough to accommodate a variety of products. This paper provides an alternate design to vibratory bowl feeders. A balanced feeder experimental setup with wiper blades was developed and optimized to maximize the conveying velocity with no part clogging. © 2021 Author(s).

AIP Conference Proceedings

Balanced feeder design: An alternative to vibratory bowl feeders

Indian Railways is the fourth-largest railway network in the world by size, with 121, 407 kilometers of total track over a 67, 368-kilometre route. Mostly the railway tracks in India have joined by bolted and large welded joints, susceptible to derailment and fractures due to the longitudinal tensile stresses (hence strain) as the temperature falls below the distressing temperature. This problem caused from mechanical sources such as braking, rolling friction and wheel flanging on curves. Usually once them temperature varies anchoring temperature, causes the compressive and tensile stress in rail tracks and rail joints, more vulnerable to thermal buckling. This paper aims to characterize the in situ thermal stress detection for different rail and rail joints. The strain gauges were employed for strain monitor. This paper examines the potential of the strain gauges for in situ thermal stress levels for increasing temperature. For economical growing countries like India, railway infrastructure plays a critical role. The resistances were monitored for incremental thermal loading. © 2021 IEEE.

Civil Engineering

2021 IEEE International Conference on Engineering, Technology and Innovation, ICE/ITMC 2021 - Proceedings

Thermal and residual strain measurement due to gradual and repetitive thermal loading in rails and rail joints using ESG

The motion of a part on a curved surface mounted upon a linear vibratory feeder is of great importance in mass production. In this article, the conveying surface or track is modelled by a bilinear surface inclined to all axes with the curvature varying throughout the surface. An experimental test rig is fabricated to study the part motion on the feeder surface. Dynamics of the part on the surface is derived and the path traced by the part is obtained numerically. The numeric model closely correlates with experimental results. Based on the control parameters two distinct regimes—slide and hop—are presented, highlighting their relation to frequency and amplitude of vibration of the feeder. © IMechE 2021.

Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science

Dynamics of part motion on a linear vibratory feeder

The correspondence cited in the title [1] derived ergodic capacity of the coherent multiple-input multiple-output (MIMO) channel in independent and identically distributed (IID) Rayleigh fading. While the theoretical results are correct, several plots in the paper are incorrect. In this correspondence, we correct the plots. More importantly, the corrected plots present an interesting and compelling contrast between performances of the coherent MIMO systems with and without channel state information at the transmitter; whereas this view is somewhat limited in [1] because of flaws in the capacity curves.

Electrical Engineering

Fulltext

IEEE Transactions on Information Theory

Comments and Corrections to “Capacity of Multiple-Antenna Systems With Both Receiver and Transmitter Channel State Information”

In this paper, molecular dynamic (MD) simulation was employed to simulate the AFM tip-based nanoscratching process on multilayer graphene to investigate graphene deformation and coefficient of friction (COF). MD Simulation results showed cross-linking structures were created at the interface of two-layer graphene during nanoindentation and nanoscratching. The loading force had a characteristic of a periodic wave crest-trough transition. The COF of the diamond tip fluctuated at around 0.15 during nanoscratching process. © 2021 Proceedings of the 21st International Conference of the European Society for Precision Engineering and Nanotechnology, EUSPEN 2021. All rights reserved.

Proceedings of the 21st International Conference of the European Society for Precision Engineering and Nanotechnology, EUSPEN 2021

Molecular dynamics simulation of AFM tip-based nanoscratching of multi-layer graphene

Road accidents are a leading cause of death and disability among youth. Contemporary research on accident detection systems is focused on either decreasing the reporting time or improving the accuracy of accident detection. Internet-of-Things (IoT) platforms have been utilized considerably in recent times to reduce the time required for rescue after an accident. This work presents an IoT-based automotive accident detection and classification (ADC) system, which uses the fusion of smartphone's built-in and connected sensors not only to detect but also to report the type of accident. This novel technique improves the rescue efficacy of various emergency services, such as emergency medical services (EMSs), fire stations, towing services, etc., as knowledge about the type of accident is extremely valuable in planning and executing rescue and relief operations. The emergency assistance providers can better equip themselves according to the situation after making an inference about the injuries sustained by the victims and the damage to the vehicle. In this work, three machine learning models based on Naïve Bayes (NB), Gaussian mixture model (GMM), and decision tree (DT) techniques are compared to identify the best ADC model. Five physical parameters related to vehicle movement, i.e., speed, absolute linear acceleration (ALA), change-in-altitude, pitch, and roll, have been used to train and test each candidate ADC model to identify the correct class of accident among collision, rollover, falloff, and no accident. NB-based ADC model is found to be highly accurate with 0.95 mean F1-score. © 2014 IEEE.

Computer Science and Engineering

IEEE Internet of Things Journal

An IoT-Based Vehicle Accident Detection and Classification System Using Sensor Fusion

A comprehensive study to understand important parameters that affects the Cavity Linear Receiver (CLR) performance has been done. In this paper, the combined optical and thermal analysis has been successfully utilized, to investigate the thermal-hydraulic behavior of CLR of cross-linear CSP (CL-CSP) system, which is developed at the Tokyo Institute of Technology proposed a new CSP technology, which is called Cross Linear Concentrating Solar Power (CL-CSP). The first demonstration plant of cross-linear concept has been installed at Rajiv Gandhi Proudyogiki Vishwavidyalaya, Bhopal (23.2599° N, 77.4126° E), the combined analysis was done using a numerical model, which has been validated with literature and experimental test. The numerical model simulates the thermal-hydraulic behavior of CLR with the variation of working condition, surface property, and geometry. The optical efficiency and thermal efficiency are the main performance parameters for the simulation. From the numerical study, distribution of both solar flux and temperature on the receiver tubes shows high non-uniformity in axial and radial direction. Furthermore, the parameters effect on the CLR performance is investigated under general working condition of receiver of 673 K temperature, 0.0925 kg/s mass flow rate, and during solar noon of summer solstice. © 2020 Elsevier Ltd

Energy

Numerical analysis of cavity receiver with parallel tubes for cross-linear concentrated solar system

GaAs is a hard, brittle material and its cutting at room-temperature is rather difficult, so the work explored whether hot conditions improve its cutting performance or not. Atomic force microscope (AFM) tip-based hot machining of the (0 1 0) oriented single crystal GaAs was simulated using molecular dynamics (MD). Three representative temperatures 600 K, 900 K and 1200 K (below the melting temperature of ~1511 K) were used to cut GaAs to benchmark against the cutting performance at 300 K using indicators such as the cutting forces, kinetic coefficient of friction, cutting temperature, shear plane angle, sub-surface damage depth, shear strain in the cutting zone, and stress on the diamond tip. Hotter conditions resulted in the reduction of cutting forces by 25% however, the kinetic coefficient of friction went up by about 8%. While material removal rate was found to increase with the increase of the substrate temperature, it was accompanied by an increase of the sub-surface damage in the substrate. Simulations at 300 K showed four major types of dislocations with Burgers vector 1/2<110>, 1/6<112>, <0–11> and 1/2<1–12> underneath the cutting zone and these were found to cause ductile response in zinc-blende GaAs. Lastly, a phenomenon of chip densification was found to occur during hot cutting which referred to the fact that the amorphous cutting chips obtained from cutting at low temperature will have lower density than the chips obtained from cutting at higher temperatures. © 2021

Materials Science in Semiconductor Processing

Molecular dynamics simulation of AFM tip-based hot scratching of nanocrystalline GaAs

Insights into the biological channels and synthetic pore-forming assemblies have elucidated many fundamental aspects of selective water and solute transport over the last few decades. This has led to the development of novel technologies with unique selectivity and permeability. In terms of membrane separation technology, this development has proceeded by adapting either of two approaches: (i) one where biological channel proteins are reconstituted in suitable materials mimicking the biological bilayer membrane and (ii) one where selective transport is mimicked in synthetic structures. The development of water filtration membranes in the former approach takes advantage of aquaporin proteins as representative building blocks and that of carbon nanotubes and molecular pore-forming assemblies in the latter approach. The first approach is often referred to as the field dominated by biomimetic membranes and the latter referred to as artificial water channels. In this study, a bibliometric analysis was conducted to investigate trends in these two areas based on growing publication trends, peer-reviewed journal selection, countries, institutions, authors, and collaborative networks. A total of 3199 records available from Scopus between 1962 and 2021 were extracted and analyzed. The results showed strong international collaborations and highlighted leading researchers and hubs of excellence in these two areas. This is very timely considering that the UN climate change conference (COP26) in Glasgow, UK later this year will bring focus to the global need for water treatment technologies. This work can serve as a quick reference for early-career researchers and industries working in the area of membrane development for water purification/filtration. © 2021, The Author(s).