![Sample our Engineering & Technology journals, sign in here to start your access, latest two full volumes FREE to you for 14 days]({"type":"image" , "src" : "/sda/5933/TOC-Subject-Sample-2021-Engineering-Tech.jpg"})
Abstract
The effect of surface undulations on natural convection in a thermally stratified vertical porous enclosure has been analyzed numerically by the finite-element method. The influence of increasing number of surface undulations ( N ) with different wave phases (φ) and different wave amplitudes ( a ) has been analyzed. Increasing either number of waves per unit length ( N ) or wave amplitudes ( a ) or thermal stratification ( S ) is seen to decrease Nusselt number (Nu). Interestingly, the periodic variation in Nu with wave phase in the presence of thermal stratification is seen to be sensitive to the number of waves ( N ) per unit length. Maximum heat flux is obtained when the wave phase 210° h φ h 240° for 0 h S h 1. Features such as secondary circulations near the wavy wall and multicellular circulations in the core of the flow field have been noticed.
