Browsing by Author "Sahoo S.S."

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Effect of selective coating on the top heat loss characteristics of trapezoidal cavity: A computational approach
(2018) Ray S.; Tripathy A.K.; Sahoo S.S.; Mahapatra S.K.
In the present work the effect of selective coating on the top heat loss characteristics of a trapezoidal cavity has been presented. Selective coatings are multi-layered coatings which enhances absorption of radiation on a surface while inhibiting emission from it. In the present study selective coating is applied on the bottom absorber plate of the trapezoidal cavity. Computational domain of the trapezoidal cavity is developed and analysed. Finite Volume Method (FVM) is employed to calculate natural convection in the domain, radiation from the bottom absorber plate to glass cover, wind induced forced convection on the glass cover and radiation from glass cover to ambient. Parametric study has been carried out by varying the input heat flux, the absorptivity of the selective coating and emissivity of the selective coating. � Published under licence by IOP Publishing Ltd.
Numerical Study on Phase Change of Water Flowing Across Two Heated Circular Cylinders in Tandem Arrangement
(2017) Dhar B.K.; Mahapatra S.K.; Maharana S.K.; Sarkar A.; Sahoo S.S.
This paper focuses on fluid flow and heat transfer analysis over two heated cylinders arranged in tandem. The flow of water over heated cylinders faces a phenomenon of phase change from liquid (water) to vapor phase (steam). The mechanism of this phase change is studied through a numerical simulation supplemented with verification and validation of the code. The problem is simulated when flows from two cylinders in a tandem arrangement become interacting and noninteracting. The Eulerian model is used during simulation to comprehend the multiphase phenomena. The effect of spacing between these two cylinders and the Reynolds number effect are studied in this paper. The volume fractions of both the water and vapor phases and the heat transfer coefficients of both the cylinders have been computed and presented as findings of the problem. � 2016 Wiley Periodicals, Inc.
Numerical study on phase change of water flowing across two heated rotating circular cylinders in tandem arrangement
(2016) Dhar B.K.; Mahapatra S.K.; Maharana S.K.; Sarkar A.; Sahoo S.S.
The problems of fluid flow and heat transfer phenomena over an array of cylinders are quite prominent in fluid dynamics and industry applications. The current work focuses on fluid flow and heat transfer analysis over two heated rotating cylinders arranged in tandem. The flow of water over heated cylinders faces a phenomenon of phase change from liquid (water) to vapor phase (steam). The mechanism of this phase change is studied through a numerical simulation supplemented with verification of the code and validation. The problem is simulated when flows from two cylinders in a tandem arrangement become interacting and non-interacting. The Eulerian model is used during simulation to comprehend the multiphase phenomena. The volume fractions of both the phases such as water and vapor and heat transfer coefficients of both the cylinders have been computed and presented as findings of the problem. The mass and heat transfer mechanism is unidirectional from one phase to the other phase. The vapor fraction of each phase is to be observed and compared when three different rotations are given to the two cylinders immersed in a turbulent flow of water. � The Author(s) 2016.