Numerical study of surface radiation and combined natural convection heat transfer in a solar cavity receiver. Issue 10 (2nd October 2017)

• Record Type: Journal Article
• Authors: Milani Shirvan, Kamel; Mamourian, Mojtaba; Mirzakhanlari, Soroush; Rahimi, A.B.; Ellahi, R.
• Is Part Of: International journal of numerical methods for heat & fluid flow. Volume 27:Issue 10(2017)
• Page Start: 2385
• Page End: 2399
• Publication Date: 2017-10-02
• Subjects: Natural convection -- Surface thermal radiation -- Combined heat transfer -- Solar cavity receiver; Heat -- Transmission -- Mathematics -- Periodicals; Fluid dynamics -- Mathematics -- Periodicals; 536.2
• DOI: 10.1108/HFF-10-2016-0419
• Languages: English
• ISSNs: 0961-5539

Abstract

Abstract : 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 (10 4 ≤ Ra ≤ 10 6 ), 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.