Abstract
The present work aims to numerical study the combined effect of free convection and surface radiation from an open hemispherical cavity and the estimation of cooling time using ANSYS-Fluent 15.0. This study warrants a significant novelty. Various parameters, such as Rayleigh numbers (in the range of to ), surface temperatures, and the radius of curvatures varied to elucidate the effect of these parameters on the heat transfer characteristics considering surface radiation. The temperature contours and velocity vectors are obtained pictorially to understand the thermo-fluid characteristics around the hemispherical surface better. For all cases, the radiative heat transfer rate is found to be higher than the convective heat transfer rate for a given condition. The estimation of cooling time is done using lumped system analysis, taking both convection and radiation into account. It is observed that the cooling time estimated with radiation is much lower than that without radiation (only convection). This signifies that the radiation effect should be considered for similar problems. Finally, for the open hemispherical cavity, a correlation for the Nusselt number is developed by incorporating the regression analysis of the available data.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
