Jet Impingement on Circular Curved Surfaces: Local Heat Transfer Analysis and Correlation Development

Jet impingement is crucial for efficient heat removal in systems with curved surfaces, offering precise and uniform cooling. The advantage lies in its precise flow to the desired location, effectively removing a substantial amount of heat. Existing literature lacks studies on local heat transfer when a jet impinges on curved surfaces, leading to significant gaps in predicting local heat transfer on curved surfaces, with no correlations available. An experimental investigation has been conducted to examine the heat transfer phenomenon occurring over a concave surface impinged by a single circular jet. The local heat transfer characteristics are studied for a concave plate positioned at 3, 6, 12, and 20 d from the nozzle, with the Reynolds number ranging from 10,000 to 75,000. The effect of surface curvature is evaluated for two surfaces with a radius of curvature of 218 and 281 mm. The infrared thermography technique is implemented to study the Nusselt number ([Formula: see text]) variation both transversely and longitudinally. Increased curvature slightly boosts the [Formula: see text] in the impingement region. However, curvature restricts jet flow, causing a decrease in the [Formula: see text]. New correlations for local and stagnation [Formula: see text] are developed, performing well across various Reynolds numbers and jet-to-plate spacing.