Abstract
This research presents structural improvement of V-shaped ribs for a tested square duct (TSD). The V-shaped ribs, which are inserted at the middle of the TSD (called type A), and the V-shaped ribs, which are placed on the opposite TSD walls (called type B), are modified to increase the structural stabilization. The effects of rib height to duct height, b / H = 0.05 – 0.30 ; V-shaped bar thickness to duct height, a / H = 0.025 and 0.050; and flow directions (V-Upstream and V-Downstream) are considered. The new design of the V-shaped ribs is called “modified V-shaped ribs or MVR.” The present problem is solved by the numerical method (commercial code). The flow and heat transfer features of the TSD are illustrated. The numerical result reveals that the MVR give both flow and heat transfer patterns similarly as the general V-shaped rib. The impinging flows, swirling flows, and disturbing thermal boundary layer, which lead to enhanced heat transfer, are observed. Over the investigated range, the enhanced heat transfer about 18.12 times above the smooth duct with the optimal thermal enhancement factor about 4.16 is detected.
Highlights
Heat exchangers, shell-and-tube heat exchanger, fin-andtube heat exchanger, double pipe heat exchanger, and solar air heater, are important machines for many industries and engineering works
Numerical predictions on heat transfer and flow features in the tested square duct (TSD) installed with the modified V-shaped rib (MVR) are reported
As the simulated results show, the summarization can be stated as follows: (i) The structural flow and heat transfer in the TSD installed with the MVR are as the general V-shaped baffle/rib
Summary
Shell-and-tube heat exchanger, fin-andtube heat exchanger, double pipe heat exchanger, and solar air heater, are important machines for many industries and engineering works. Rib/baffle [1,2,3] is a type of the vortex generators which always select to help to improve heat transfer rate and efficiency of the heat exchangers, especially V-shaped rib. Jin et al [8] numerically investigated the augmented heat transfer in a solar air heater with multiple-shaped ribs. Jin et al [11, 12] improved the thermal performance of a solar air heater by using multiple V-shaped ribs. Ravi and Saini [16] installed discrete multi-Vshaped and staggered ribs on both sides of an absorber plate to augment Nusselt number in a solar air heater. The heat transfer rate and thermal performance in the heat exchangers obviously augment when installed with the V-shaped rib/baffle. The heat transfer and flow mechanisms in the TSD are significant knowledge for the vortex generator and heat exchanger improvements
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