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Institution

National Institute of Technology, Meghalaya

EducationShillong, India
About: National Institute of Technology, Meghalaya is a education organization based out in Shillong, India. It is known for research contribution in the topics: Control theory & Electric power system. The organization has 503 authors who have published 1062 publications receiving 6818 citations. The organization is also known as: NIT Meghalaya & NITM.

Papers published on a yearly basis

Papers
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Journal ArticleDOI
TL;DR: In this article, the combined effect of PBCF and propeller ducts as ESDs to improve propeller efficiency was investigated in a moving reference frame approach, and numerical investigations were performed with propeller and 19A duct.
Abstract: Propeller is the main device in marine vehicle to generate propulsive energy. During practical manoeuvring condition, it losses a major part of energy due to the formation of hub as well as tip vortex. This fact becomes a great concern for researcher and motivates to find some alternate energy saving device (ESD). In this paper numerical investigations, based on Reynolds Average Navier Stokes (RANS) equation, are carried out to observe the combined effect of PBCF and propeller duct as ESDs to improve propeller efficiency. Here, aerofoil shape PBCF with NACA4412 profile has been combined with 19A and 19Am duct to observe their ability to improve propeller efficiency in moving reference frame approach. Along that to make a comparative study, numerical investigations are also performed with propeller and 19A duct without PBCF. Results show that in comparison to the combined effect of PBCF and ducted propeller, only duct (19A) without PBCF plays a prominent role to enhance propeller efficiency by approximately 9.21%. To obtain more details of flow phenomenon, fluctuation of velocity, pressure, vortex strength, etc., at various locations are also investigated. Besides that, the effect of angle of attack of the duct on a PBCF introduced ducted propeller is also investigated numerically.

2 citations

Book ChapterDOI
01 Jan 2020
TL;DR: In this article, a technique of detecting the LDR frequency of a flat bottom hole (FBH) damage by an advanced signal processing tool called bicoherence estimation is discussed.
Abstract: The diagnosing of complicated defects in any structures can be performed effectively with high accuracy using nonlinear wave spectroscopy (NWS). The flaws present in any material can be detected using NWS technique based on local defect resonance (LDR) phenomenon. The present work discusses a technique of detecting the LDR frequency of a flat-bottom hole (FBH) damage by an advanced signal processing tool called bicoherence estimation. The analytical solution of the LDR is used to estimate a frequency sweep range of the input chirp signal. Signal processing using fast Fourier transform and bicoherence estimation is carried out on the output signal for obtaining the damage frequency and its second-order harmonics, respectively. Subsequently, steady-state analysis is performed in order to validate the results obtained from bicoherence estimation. The technique of bicoherence estimation is found to be very efficient in detection of LDR frequencies of plate with FBH.

2 citations

Book ChapterDOI
01 Jan 2020
TL;DR: In this article, three different mini-channels with differently configured interconnecting secondary channels heat sink geometry have been purposed and mathematical model is solved using finite volume method(FVM ) technique in ANSYS fluent solver has been used to investigate the problem numerically.
Abstract: Augmentation of heat removal rate from an electronic device becomes an important viewpoint for enhancing the performance and lifetime of an electronic device. Overheating electronic devices may cause damage to hardware and software. Water-cooled Mini-channel heat sink (MCHS) is a profitable and basic cooling method for cooling of electronic equipments. In this research paper, three different mini-channels with differently configured interconnecting secondary channels heat sink geometry have been purposed and mathematical model is solved using finite volume method(FVM ) technique in ANSYS fluent solver has been used to investigate the problem numerically. Water is utilized as a coolant and streamflow is laminar, single phase in all setup of MCHS. The numerical outcomes demonstrate that minimum base plate temperature (BPT) of MCHS is observed at 10° secondary channel angle; hence, maximum performance of electronic device will be analyzed at 10° secondary channel angle.

2 citations

Journal ArticleDOI
TL;DR: A novel technique for secure multihop communication in cognitive radio networks is proposed which allows the use of non-contiguous channels for communication of multimedia data without compromising the desired QoS.
Abstract: In this paper, a novel technique for secure multihop communication in cognitive radio networks is proposed which allows the use of non-contiguous channels for communication of multimedia data without compromising the desired QoS. This technique first creates a number of sub-packets formed by suitably shuffling the bits of the original packet, finds multiple routes by executing the max-flow algorithm on a derivative of the network graph to meet the required bandwidth, suitably allocates channels for each hop in the multiple paths using the features of cognitive radio networks, and sends the sub-packets along these channels which are received by the destination node to form the original packet. This strategy also leads to significantly enhanced security of the data packets against the eavesdropping attack when multiple node-disjoint paths are chosen for transmitting the sub-packets.

2 citations

Journal ArticleDOI
TL;DR: In this article, a regenerator-type sensible energy storage (SES) of 1MJ capacity is developed for its application in the low-temperature region and hilly region like Meghalaya.
Abstract: Thermal energy storage system became an answer to store the intermittent solar energy in the recent time. In this study, regenerator-type sensible energy storage (SES) of 1 MJ capacity is developed for its application in the low-temperature region and hilly region like Meghalaya. Concrete and water are chosen as the substance to store energy and heat transfer fluid, respectively, owing to their suitable thermophysical properties. The influences of embedded tube diameter and pitch circle diameter (PCD) on the heat storage ratio and heat release ratio are investigated in the present study. Computational work is carried out using COMSOL Multiphysics software, and validation results show a good match with the published results in the literature. Upon optimizing the number of tubes in the preliminary study, 25 embedded tubes are considered for the further analysis. It is found that both the heat storage ratio and heat release ratio increase with increasing pitch circle diameter and embedded tubes diameter. At the same time, both the effective charging time and effective discharging time decrease with increasing pitch circle diameter and embedded tubes diameter. Finally, exergy analysis is performed for SES system. Maximum exergy factor is found in the case of tube arrangement at 6 cm PCD with 1.71 cm embedded tube diameter.

2 citations


Authors

Showing all 517 results

NameH-indexPapersCitations
Sudip Misra485359846
Robert Wille434576881
Paul C. van Oorschot4115021478
Sourav Das301744026
Mukul Pradhan23531990
Bibhuti Bhusan Biswal201551413
Naba K. Nath20391813
Atanu Singha Roy19481071
Akhilendra Pratap Singh19991775
Abhishek Singh191071354
Vinay Kumar191301442
Dipankar Das19671904
Gayadhar Panda181231093
Gitish K. Dutta16261168
Kamalika Datta1569676
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Performance
Metrics
No. of papers from the Institution in previous years
YearPapers
20237
202236
2021191
2020220
2019184
2018155