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14 results on '"Kumawat, Devilal"'

1. Thermal Instability of the Couple-Stress on Micro Polar Fluid Flow

Author

Kumawat, Devilal, Pankaj, Ram Dayal, Kacprzyk, Janusz, Series Editor, Gomide, Fernando, Advisory Editor, Kaynak, Okyay, Advisory Editor, Liu, Derong, Advisory Editor, Pedrycz, Witold, Advisory Editor, Polycarpou, Marios M., Advisory Editor, Rudas, Imre J., Advisory Editor, Wang, Jun, Advisory Editor, Singh, Jagdev, editor, Anastassiou, George A., editor, Baleanu, Dumitru, editor, and Kumar, Devendra, editor

Published
2024
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5. Effect of chamber pressure on the output characteristics of a low-pressure DC plasma torch.

Author

Krushna Mohanta, Ram, Kumawat, Devilal, and Ravi, G

Subjects
*PLASMA torch, *PLASMA jets, *ELECTRON distribution, *THERMAL plasmas, *PLASMA temperature, *ELECTRIC arc, *MICROBIAL fuel cells
Abstract

This study explores the effects of chamber pressure on the electrical and thermodynamic characteristics of a low-pressure thermal plasma jet. The investigation focuses on current–voltage characteristics, arc voltage fluctuations, plasma jet temperature, electron density, and velocity within the range of 100–500 A arc current, at chamber pressures of 100 Pa, 1 kPa, and 3 kPa. Spectral analysis of the arc voltage reveals the presence of distinct frequencies, including restrike, Helmholtz, and acoustic modes, which exhibit varying behavior under different chamber pressure conditions. Restrike frequency shows an increase with decreasing chamber pressure, while Helmholtz frequency remains unaffected, and the power density of the acoustic frequency diminishes, eventually disappearing from the spectrum. The transition of the plasma jet from a continuum regime to a frozen state with decreasing chamber pressure is observed along with its shock structures. Optical emission spectroscopy is utilized to map the excitation temperature and electron density profile along the jet axis, demonstrating that the jet temperature and density peaks at the compression zone. Furthermore, Mach probe measurements of the plasma jet velocity at different axial locations, under various chamber pressure conditions, illustrate that the plasma jet maintains a supersonic state, regardless of chamber pressure. However, after the formation of a Mach disk, the jet velocity becomes subsonic. The highest velocity is achieved at 100 Pa chamber pressure, reaching Mach 2.9 at 50 mm from the anode exit. This research enhances our understanding of thermal plasma jets under low-pressure conditions, contributing to the advancement of knowledge in their applications across various domains. [ABSTRACT FROM AUTHOR]

Published
2023
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7. Overview of physics results from the ADITYA-U tokamak and future experiments

Author

Tanna, R L, primary, Ghosh, Joydeep, additional, Jadeja, Kumarpalsinh A, additional, Kumar, Rohit, additional, Aich, Suman, additional, Patel, Kaushal, additional, Raj, Harshita, additional, Singh, Kaushlender, additional, Dolui, Suman, additional, Shah, Kajal, additional, Patel, Sharvil, additional, Yadava, Nandini, additional, Macwan, Tanmay, additional, Kanik, Abha, additional, Kumar, Ankit, additional, Hegde, Bharat, additional, Kumawat, Ashok Kumar, additional, Kundu, Ananya, additional, Joshi, Ramesh, additional, Sharma, Deepti, additional, Patel, Ankit B, additional, Pradhan, Laxmikanta, additional, Galodiya, Kalpesh, additional, Pandya, Shwetang N, additional, Banerjee, Soumitra, additional, Hoque, Injamul, additional, Yadav, Komal, additional, Chowdhuri, Malay Bikas, additional, Manchanda, Ranjana, additional, Ramaiya, Nilam, additional, Dey, Ritu, additional, Shukla, Gaurav, additional, Modi, Dipexa, additional, Sharma, Vishal, additional, Gauttam, Aman, additional, Makwana, Moti, additional, Shah, Kunal S, additional, Gupta, Shivam, additional, Nair, Supriya, additional, Purohit, Shishir, additional, Nagora, Umesh, additional, Adhiya, Asha, additional, Patel, Kiran, additional, Asudani, Kumudni, additional, Jha, S Kumar, additional, Kumawat, Devilal, additional, Pandya, Santosh P, additional, Siju, Varsha, additional, V, Praveenlal E, additional, Arambhadiya, Bharat, additional, Shah, Minsha, additional, Gautam, Pramila, additional, Raulji, Vismay, additional, Shukla, Praveena, additional, Kumar, Abhijeet, additional, Patel, Mitesh, additional, Rajpal, Rachana, additional, Bhandarkar, Manisha, additional, Mansuri, Imran, additional, Mahajan, Kirti, additional, Mishra, Kishore, additional, Kumar, Sunil, additional, Shukla, Braj K, additional, Kumar, Jagabandhu, additional, Sharma, P K, additional, Aggarwal, Snehlata, additional, Ajay, Kumar, additional, Gupta, Manoj Kumar, additional, Pathak, Surya Kumar, additional, Chattopadhyay, P K, additional, Raju, D, additional, Dutta, Someswar, additional, Pahari, Sambaran, additional, Bisai, Nirmal, additional, Chauhan, Chetna, additional, Saxena, Y C, additional, Sen, Abhijit, additional, Pal, Rabindranath, additional, and Chaturvedi, Shashank, additional

Published
2024
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9. Real-time feedback control system for ADITYA-U horizontal plasma position stabilisation

Author

Kumar, Rohit, Gautam, Pramila, Gupta, Shivam, Tanna, R.L., Edappala, Praveenlal, Shah, Minsha, Raulji, Vismay, Jadeja, K.A., Patel, K.M., Macwan, Tanmay, Manchanda, Ranjana, Chowdhuri, M.B., Yadava, Nandini, Shah, Kunal, Makwana, M.N., Balakrishnan, V., Gupta, C.N., Aich, Suman, Kumawat, Devilal, Raj, Harshita, Sathyanarayana, K., Ghosh, Joydeep, Rajpal, Rachna, Chattopadhyay, P.K., and Saxena, Y.C.

Published
2021
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11. First results of fast visible imaging diagnostic in Aditya-U tokamak

Author

Kumawat, Devilal, primary, Tahiliani, Kumudni, additional, I, Suresh, additional, Pathak, S. K., additional, Pandya, Santosh P., additional, Kumar, Sameer, additional, Daniel, Raju, additional, Tanna, R. L., additional, Ghosh, Joydeep, additional, Nagora, Umesh, additional, Gupta, Manoj K., additional, Kumar, Rohit, additional, Jadeja, Kumarpalsinh, additional, and Aich, Suman, additional

Published
2022
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12. Effect of the Couple-Stress on Micro Polar Rotating Fluid Flow Saturating a Porous Medium.

Author

Kumawat, Devilal, Pankaj, Ram Dayal, and Mehta, Vijay

Subjects
*MICROPOLAR elasticity, *ROTATING fluid, *POROUS materials, *FLUID flow, *GRAVITATIONAL fields, *PERMEABILITY
Abstract

Effect of the couple-stress on micro polar rotating uid layer heated from below in the presence of varying gravitational field in a porous medium is studied, using normal mode, the problem has been analyzed and it is found that the permeability has destabilizing effect. The rotation, couple-stress parameter and micro-polar parameters have stabilizing effect. The condition of over stability has been found. [ABSTRACT FROM AUTHOR]

Published
2023

13. Lithium wall conditioning techniques in ADITYA-U tokamak for impurity and fuel control

Author

Jadeja, K.A., primary, Ghosh, J., additional, Yadava, Nandini, additional, Patel, K.M., additional, Patel, Kiran, additional, Tanna, R.L., additional, Manchanda, R., additional, Chowdhuri, M.B., additional, Raval, J.V., additional, Nagora, U.C., additional, Arambhadiya, B.G., additional, Macwan, Tanmay, additional, Singh, K., additional, Dolui, S., additional, Shah, Minsha, additional, Patel, Sharvil, additional, Ramaiya, N., additional, Shah, Kajal, additional, Shukla, B.K., additional, Aich, Suman, additional, Kumar, Rohit, additional, Panchal, V.K., additional, Kumar, Manoj, additional, Atrey, P.K., additional, Pathak, S.K., additional, Rajpal, Rachana, additional, Assudani, Kumudni, additional, Gopalakrishna, M.V., additional, Kumawat, Devilal, additional, Makwana, M.N., additional, Shah, K.S., additional, Gupta, Shivam, additional, Gupta, C.N., additional, Balakrishnan, V., additional, Chattopadhyay, P.K., additional, and Kataria, B.R., additional

Published
2021
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14. Electrical-Model of ADITYA-U Tokamak.

Author

Kumawat, Devilal, Kumar, Rohit, Macwan, Tanmay, Ghosh, Joydeep, Tanna, Rakesh, Aich, Suman, Jha, S. K., and Raju, D.

Abstract

An Electrical-Model is developed for ADITYA-U Tokamak to study the generation of different shapes and duration of LVs out of the total available flux, which is 0.6 Vs in positive convertor supply. Loop voltage (LV) is required to be controlled during plasma discharge to optimize and predict the breakdown of plasma, proper impurity burn-through time, plasma current magnitude and duration of the plasma as per the experimental requirement. Loop voltage waveform is governed by selecting different magnitudes of resistance values, switching time and duration of external resistance in the wave shaping primary circuit. Loop voltage control system has been modelled using simulation code (Electrical-Model). Same results have been validated with the modelling of ohmic wave shaping circuit in MATLAB-Simulink. Temporal profile of loop voltage has been incorporated for ADITYA-U Tokamak for several plasma discharges, and detailed observations and results are presented in the paper. [ABSTRACT FROM AUTHOR]

Published
2021
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