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Your search keyword '"Nayak, Arun K."' showing total 2 results
Start Over Author "Nayak, Arun K." Publication Year Range Last 50 years Publisher american institute of physics
2 results on '"Nayak, Arun K."'

1. Comparison of predicted dryout values under different deposition model consideration.

Author

Kumar, Rakesh, Nayak, Arun K., and Chandraker, Dinesh K.

Subjects
*PHENOMENOLOGICAL theory (Physics), *BOILING water reactors
Abstract

Flow oscillation can happen in natural circulation boiling water reactors, if stat up procedure deviates from predefined path. Because of the flow oscillations, Premature CHF can have occurred. Hence predicting the CHF under flow oscillation is very important for reactor design considerations. Determination of CHF by the experimentation is very costly and it depends on the particular types of geometry of road bundle. CHF can be predicting based on physical phenomena known as mechanistic modelling. For incorporating the effect of deposition rate entrainment rate, empirical correlations are used. Efficacy of any mechanistic model is depend on the types of deposition model and entrainment model have been used in that model. In this paper, different deposition model available in the open literature have been taken for consideration and predicted value of each deposition model is compared from the experimental data.. [ABSTRACT FROM AUTHOR]

Published
2023
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2. Sonneting critical heat flux: New insights in boiling multiphase flow.

Author

Vadlamudi, Sai Raja Gopal and Nayak, Arun K.

Subjects
*MULTIPHASE flow, *HEAT flux, *HEATING, *SURFACE temperature, *HEAT
Abstract

Boiling—a process widely used for its good heat transferability—is limited by a phenomenon known as critical heat flux (CHF). Our experiments revealed a new CHF mechanism that is different from previously believed theories; we refer to it as "sonneting CHF." At CHF, the flow pattern changes from bubbly flow to slug/churn flow and then to an unusual reverse annular flow, leading to a significant rise in the heater surface temperature. The reverse annular flow, however, does not sustain but breaks down into a chaotic flow pattern, resulting in unprecedented quenching of the heater surface. The flow pattern shortly reverts back to bubbly flow; this entire process repeats for a few cycles, where the heater surface temperature rises and falls with amplitudes increasing in each cycle until the heater trips. The maximum removal-surface heat flux is significantly higher than the CHF. This new understanding will enable flexible and innovative boiling systems for several energy applications. [ABSTRACT FROM AUTHOR]

Published
2020
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