Numerical study of surface radiation and combined natural convection heat transfer in a solar cavity receiver

Purpose The purpose of this paper is to present the numerical solutions of surface radiation and combined natural convection heat transfer in a solar cavity receiver. The paper aims to discuss sundry issues that take place in the said model. Design/methodology/approach The numerical solutions are de...

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Bibliographic Details
Published in:International journal of numerical methods for heat & fluid flow 2017-10, Vol.27 (10), p.2385-2399
Main Authors: Milani Shirvan, Kamel, Mamourian, Mojtaba, Mirzakhanlari, Soroush, Rahimi, A.B, Ellahi, R
Format: Article
Language:English
Subjects:
Algorithms
Approximation
Boundary conditions
Computational fluid dynamics
Convection
Emissivity
Fluid flow
Graphs
Heat
Heat transfer
Impact analysis
Inclination angle
Lines
Mathematical models
Nanoparticles
Numerical analysis
Physical factors
Radiation
Rayleigh number
Solar energy
Solutions
Studies
Tables
Viscosity
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Summary:Purpose The purpose of this paper is to present the numerical solutions of surface radiation and combined natural convection heat transfer in a solar cavity receiver. The paper aims to discuss sundry issues that take place in the said model. Design/methodology/approach The numerical solutions are developed by means of second-order upwind scheme using the SIMPLE algorithm. Findings The effects of physical factors such as Rayleigh number (104 ≤ Ra ≤ 106), inclination angels of insulated walls (0º ≤ θ ≤ 10º) and the wall surface emissivity (0 ≤ ε ≤ 1) on natural convection-surface radiation heat transfer rate are analyzed. Impact of sundry parameters on flow quantities are discussed and displayed via graphs and tables. Stream lines and isothermal lines have also been drawn in the region of cavity. The numerical results reveal that increasing the Rayleigh number, wall surface emissivity and inclination angels of insulated walls in an open cavity enhances the mean total Nusselt number. The variations of the surface radiation and natural convection heat transfer mean Nusselt numbers are very small to the inclination angle of θ, while a significant change is noted for the case of Rayleigh number and emissivity. Originality/value To the best of authors’ knowledge, this model is reported for the first time.
ISSN:0961-5539
1758-6585
DOI:10.1108/HFF-10-2016-0419