Heat transfer enhancement of backward-facing step flow in a channel by using baffle installation on the channel wall

摘要

Aiming to enhance the heat transfer characteristics of backward-facing step flow in a channel, the present Study proposes a method to install a baffle onto the channel wall. The effects of the dimensionless baffle height H-b, battle thickness W-b, and distance between the backward-Facing step and baffle D on the flow Structure. temperature distribution and Nusselt number variation For the system at Various Re and Gr/Re-2 are numerically investigated. Comparing the results of the cases with or Without the installation of baffle. the maximum augmentation on average Nusselt number is about 190% for the heating step and 150% for the beating section of the bottom plate when Pr = 0.7, H-s = 0.5, L = 5, H-b = 0.3. W-b = 0.2, 100 less than or equal to Re less than or equal to 500 and 0 less than or equal to Gr/Re-2 less than or equal to 1. A slight movement of the baffle position could cause a drastic change in the transfer characteristics. In addition, as W-b varies from 0.2 to 0.5, the difference in the average Nusselt number is within 3%.