Heat and mass transfer enhancement in a double diffusive mixed convection lid cavity under pulsating flow

• Published in: Computers & chemical engineering Vol. 94; pp. 128 - 140
• Main Authors: Soto-Meca, A., Serna, J., Velasco, F.J.S.
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 02.11.2016
• Subjects: Buoyancy; Chemical engineering; Convection; Double diffusive process; Heat transfer; Holes; Mass transfer; Network Simulation Method; Oscillating flow regime; Promotion; Pulsating flow; Richardson number; Shear stress; Double diffusive process; Oscillating flow regime; 80M25; 80A20; Network Simulation Method; Heat transfer; Mass transfer; Pulsating flow
• ISSN: 0098-1354; 1873-4375
• DOI: 10.1016/j.compchemeng.2016.06.018

•Pulsating flow is used to enhance heat/mass transfer in double diffusive problems.•The pulsating regime enhances heat/mass transfer within a cavity up to a 14%/38%.•The influence of the pulse frequency, the wave number, and the amplitude of the forcing flow is assessed.•As Richardson number or Brownian diffusion increases, transfer phenomena increase.•As solute-thermal buoyancy ratio increases, transfer phenomena increase. This work assess the effectiveness of the pulsating flow regime for the enhancement of heat and mass transfer in double diffusive problems by studying a two-dimensional, heated, lid cavity. The research characterizes the influence of pulsating parameters such as temporal frequency, wave number and amplitude in the process. Results show that the pulsating regime enhances heat/mass transfer within a square cavity up to a 14%/38% respectively with respect to the non-pulsating case, due to the promotion of additional shear stress fields. As Richardson number, Brownian diffusion or the solute/thermal buoyancy ratio increase or the cavity becomes narrower, heat/mass transfer increases.