Convection heat transfer augmentation inside a hybrid corrugated channel by varying the positions of corrugated configurations

Abstract

A numerical investigation was carried out to evaluate the thermo-hydraulic characteristics of a corrugated channel utilizing both single and hybrid corrugated configurations. The single corrugation configurations consisted of trapezoidal and saw-tooth corrugations, denoted as Single Corrugation-1 (SC1) and Single Corrugation-2 (SC2). In addition, the hybrid corrugated configurations included four distinct arrangements, each combining trapezoidal, saw-tooth, and triangular cavities in different ways, represented as Hybrid Corrugation-1 (HC1), Hybrid Corrugation-2 (HC2), Hybrid Corrugation-3 (HC3), and Hybrid Corrugation-4 (HC4). The flow was considered steady, two-dimensional, laminar with Reynolds numbers (Re = 500–900), while a heat flux of 2000 W/m2 was applied along the corrugated wall. The findings demonstrated that the flow and temperature contours were significantly influenced by both single and hybrid corrugated configurations. All hybrid corrugations showed Nusselt number (Nu) enhancements of 20%–36% compared to SC1 and 40%–60% compared to SC2 at Re = 900. Moreover, hybrid corrugated configurations showed better Thermal Hydraulic Performance (THP) compared to single corrugations. At Re = 900, the THP values for HC1, HC2, HC3, and HC4 were 0.95, 1.12, 1.05, and 1.02 compared to SC1, and 1.26, 1.49, 1.39, and 1.35 compared to SC2. Notably, among all the cases, HC2 demonstrated the most significant increase in heat transfer.

Keywords

• Single corrugation
• Hybrid corrugation
• Nusselt number
• Thermal hydraulic performance
• Skin friction