*Proceeding Paper* **Inclined Rayleigh–Benard Convection: Role of Critical Aspect Ratio in Vertical Cavities †**

**Wajeeha Siddiqui**

Department of Mechanical Engineering, CEME, National University of Sciences and Technology, Islamabad 44000, Pakistan; wajeeha.siddiqui16@me.ceme.edu.pk

† Presented at the Third International Conference on Advances in Mechanical Engineering 2023 (ICAME-23), Islamabad, Pakistan, 24 August 2023.

**Abstract:** Inclined Rayleigh–Benard Convection (RBC) is numerically investigated in a two-dimensional vertical cavity; the critical aspect ratio and the critical Rayleigh number are discussed. It is established that beyond the 6500 Rayleigh number, secondary cell formation starts in the cavity. But this phenomenon is not visible at lower aspect ratios. The presence of secondary cells is directly related to heat transfer across the cavity. In recent times, insulated glazing units (IGUs) have been considered for better thermal performance, typically in energy-efficient buildings. The study gains significance by gauging the performance and optimization of IGUs.

**Keywords:** Rayleigh–Benard convection; aspect ratio; Rayleigh number
