Role of distributed/discrete solar heaters for the entropy generation studies in the square and triangular cavities during natural convection

摘要: Abstract In the present age of energy crisis, various engineering and processing industries demand thermally efficient processes. The thermal efficiency is related with entropy generation minimization a process will lead to significant savings. distributed/discrete solar heaters convert radiation directly into heat at an appreciable conversion rate. work involves studies within square triangular (type 1 type 2) cavities subjected discrete heating from side walls involving five different distributed configurations (cases 1–4: symmetric heating, case 5: asymmetric heating) along fluids Pr = 0.015 7 . 2 for wide range Ra ( 10 3 - 5 ) optimal heater arrangement also proposed enclosures. terms velocity gradients are evaluated accurately based on elemental basis set via Galerkin finite element method. total rate S found increase average Bejan number Be av decrease indicating in dominance fluid friction irreversibility higher all cases. It was that strategy central positioning (case 3) any cavity reasonable transfer lesser both Pr.