Analysis of heatline based visualization for thermal management during mixed convection of hot/cold fluids within entrapped triangular cavities (original) (raw)

2017, Journal of The Taiwan Institute of Chemical Engineers

A comprehensive investigation has been carried out to analyze the fluid and heat flow during mixed convection in entrapped triangular cavities for heat disposal (case 1: hot inclined and cold horizontal wall) and heat recovery (case 2: cold inclined and hot horizontal walls) to/from the industrial fluids via heatline approach. Galerkin finite element method is employed to solve the governing equations and the results are illustrated for various Grashof numbers (10 3 ≤ Gr ≤ 10 5), Prandtl numbers (Pr = 0. 026 and 7.2) and Reynolds numbers (1 ≤ Re ≤ 100). At Re = 1 , the symmetric fluid circulation cells occur whereas, the asymmetric fluid circulation cells occur at Re ≥ 10 and Gr = 10 5 in both the cases and both Pr. The conduction dominant heat transfer is observed at Pr = 0. 026 and Gr = 10 5 involving all Re. In contrast to Pr = 0. 026 , the heat flow field is highly influenced by the fluid flow field at Pr = 7. 2 for all Re and Gr = 10 5. In the upper cavity, the average Nusselt number of the top wall (Nu t) is higher at Re → 0, Gr = 10 5 for the case 1, and at Re = 100 , Gr = 10 3 for the case 2 involving Pr = 7. 2. In the lower cavity, the average Nusselt number of the bottom wall (Nu b) is higher at Re = 100 , Gr = 10 3 for the case 1, and at Re → 0, Gr = 10 5 for the case 2 involving Pr = 7. 2 .

Loading...

Loading Preview

Sorry, preview is currently unavailable. You can download the paper by clicking the button above.