@article{(Open Science Index):https://publications.waset.org/pdf/10002713, title = {Effects of Roughness Elements on Heat Transfer during Natural Convection}, author = {M. Yousaf and S. Usman}, country = {}, institution = {}, abstract = {The present study focused on the investigation of the effects of roughness elements on heat transfer during natural convection in a rectangular cavity using numerical technique. Roughness elements were introduced on the bottom hot wall with a normalized amplitude (A*/H) of 0.1. Thermal and hydrodynamic behaviors were studied using computational method based on Lattice Boltzmann method (LBM). Numerical studies were performed for a laminar flow in the range of Rayleigh number (Ra) from 103 to 106 for a rectangular cavity of aspect ratio (L/H) 2.0 with a fluid of Prandtl number (Pr) 1.0. The presence of the sinusoidal roughness elements caused a minimum to maximum decrease in the heat transfer as 7% to 17% respectively compared to smooth enclosure. The results are presented for mean Nusselt number (Nu), isotherms and streamlines.}, journal = {International Journal of Chemical and Molecular Engineering}, volume = {9}, number = {11}, year = {2015}, pages = {1287 - 1292}, ee = {https://publications.waset.org/pdf/10002713}, url = {https://publications.waset.org/vol/107}, bibsource = {https://publications.waset.org/}, issn = {eISSN: 1307-6892}, publisher = {World Academy of Science, Engineering and Technology}, index = {Open Science Index 107, 2015}, }