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- 저자 : Rajagopal Karthikeyan (검색결과 3 건)
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Rajagopal Karthikeyan,Kingni Sifeu Takougang,Kom Guillaume Honoré,Pham Viet-Thanh,Karthikeyan Anitha,Jafari Sajad 한국물리학회 2020 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.77 No.2
A chaotic simple jerk system (SJS) that belongs to systems with self-excited and hidden attractors is introduced in this paper. The dynamics of the proposed SJS is analytically and numerically investigated. Interestingly, the influence of the time delay on the proposed chaotic SJS is studied. In addition, the physical existence of self-excited and hidden chaotic attractors found in the proposed SJS and in the time-delayed form of SJSs (TDSJSs) are verified by using Orcard-PSpice software. Finally, chaos synchronization of identical, unidirectional, coupled, proposed chaotic TDSJSs is also reported.
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Numerical modelling of dry-out in pulsating heat pipe using VOF model
Karthikeyan Cheiyar Palani,Deepakkumar Rajagopal 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.8
Operational limits are critical in the continuous functioning of a pulsating heat pipe (PHP). A computational fluid dynamics study was conducted to analyze the influence of working-fluid properties on the dry-out limit of closed-loop water-based PHP with a 50 % fill ratio. Working fluid (water) was boiled decisively at low temperature (35 °C) under reduced operating pressures to ease and analyze dry-out. Although, vapor pressure of water at 35 °C is 5.6 kPa; different evacuated pressures ranging from 2 to 10 kPa were attempted to validate the numerical model using different boiling characteristics and their influence on the dry-out phenomena. 2-D transient pressure based Navier-Stokes solver (ANSYS Fluent) was used to predict the field variables using the SIMPLE algorithm. The standard k-ϵ model with the enhanced wall treatment approach was used to capture the turbulent physics. VOF model was used to shape the two-phase flow characteristics. The adiabatic section was noticed to act as a functional barrier (for the pressure drop to occur) between evaporator and condenser sections. New concepts such as inverse flow dynamics, zero-gradient and equivalent points were established from time variation plots of working fluid properties.
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Rajagopal Jayakumar,Manivasagan Rajasimman,Chinnappan Karthikeyan 한국화학공학회 2015 Korean Journal of Chemical Engineering Vol.32 No.10
The present investigation deals with the sorption of Cr(VI) onto a marine brown algae Sargassum myriocystum in batch reactors. Response surface methodology (RSM) was used for the optimization of variables like pH, sorbent dosage (g/L), agitation speed (rpm) and contact time (min). A maximum percentage removal of Cr(VI) by Sargassum myriocystum occurs at the following conditions: pH - 5.2; sorbent dosage - 2.017 g/L; agitation speed - 120 rpm and contact time - 108min. Before and after sorption, Sargassum myriocystum was characterized. Kinetic studies were performed using various kinetic models. It was found that the sorption process of Cr(VI) ions follows pseudo-second order, Elovich and power function kinetics. The data obtained were fitted to different isotherms. Sorption of Cr(VI) onto Sargassum myriocystum follows Langmuir and Toth isotherm models (R2=0.993 and 0.992), with a maximum sorption capacity of 66.66mg/g. The calculated thermodynamic parameters such as ΔGo, ΔHo and ΔSo showed that the sorption of Cr(VI) ions onto Sargassum myriocystum biomass was feasible, spontaneous and endothermic. Desorption experiments show that the Sargassum myriocystum sorbent can be regenerated using 0.2M HCl solutions with up to 80% recovery.
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