Work

The impact of vortex generator positioning and heated surface orientation on thermal performance and flow dynamics in asymmetrically heated duct

Year: 2025

Type: article

Abstract: This computational investigation primarily explores the impact of three factors on thermo-hydraulic performance: the dimensionless distance ratio (z/L), ranging from -0.1 to 0.5, the positioning of the heated surface [HS] relative to the delta winglet [DW] as HS-Up and HS-Down, and the configuration of the DWs relative to the mainstream as pointing upstream [DW-PU] and pointing downstream [DW-PD]. A comprehensive analysis of the resulting data reveals that the DW-PD configuration yields lower Darcy friction factors across all z/L ratios compared to DW-PU layout, exhibiting reductions of 6.35% at z/L = -0.1 and 3.49% at z/L = 0.5. The DW-PD setup with HS-Down demonstrates the best thermal performance among all configurations and dimensionless distance ratios (except z/L=-0.1). Moreover, the optimum dimensionless distance ratios for achieving the highest Nusselt numbers are determined as z/L = 0.1 for HS-Up and z/L = 0.2 for HS-Down under both configurations. The computational data indicates that the difference between the maximum and minimum Thermal Enhancement Factor [TEF] is approximately 23.78% and the highest TEF=1.25, is achieved with the utilization of DW-PD at z/L = 0.2 for HS-Down at Re=5000. This study underscores the critical significance of examining all these parameters to attain the highest thermal performance.

Source: Case Studies in Thermal Engineering

DOI: 10.1016/j.csite.2025.106075

Author: Hüseyin Zahit Demirağ

Institution: Yozgat Bozok Üniversitesi

Language: English

Topic: Heat Transfer Mechanisms

Subfield: Mechanical Engineering

Field: Engineering

Domain: Physical Sciences

SDG: Affordable and clean energy

Open Access status: gold

Estimated APC paid: $1,620