natural convection between vertical parallel plates occurs frequently in applications such as solar collectors and cooling of electronic instruments. the problem is a two dimensional developing buoyant flow. in this work, the two dimensional conservation equations are solved numerically for constant wall temperature and constant wall heat flux. the results for the local nusselt number at the du...

Related Articles Fluorescence enhancing under UV-NIR simultaneous-excitation in ZnS:Cu,Mn phosphors AIP Advances 2, 042172 (2012) Mode coupling by plasmonic surface scatterers in thin-film silicon solar cells Appl. Phys. Lett. 101, 221110 (2012) Error analysis for concentrated solar collectors J. Renewable Sustainable Energy 4, 063125 (2012) Effects of the Al cathode evaporation rate on the per...

This paper explores the benefits and drawbacks of using carbon dioxide in solar thermal systems at medium and high operating temperatures. For medium temperatures, application of CO2 in non-imaging-optics based compound parabolic concentrators (CPC) combined with evacuated-tube collectors is studied. These collectors have been shown to obtain efficiencies higher than 40% operating at around 200...

All around planet Earth, access to drinkable fresh water is a problem with increasing relevance, being its scarceness the origin of many diseases, namely in underdeveloped countries and a potential motivation to future conflicts. The present work focuses in the modelling of solar still systems of salt water, aiming at producing fresh water, having considered for that purpose four types of insta...