Impingement Heat Transfer on Dimpled Surfaces Using a Transient Liquid Crystal Technique

Measurement of detailed heat transfer on a surface under arrays of impinging elliptic jets by a transient liquid crystal technique

“…By using the results of smoke visualization, oil paint and liquid crystal techniques, vortex structure induced by the impinging jets were studied. Recently, Yan et al [15] extended the previous experimental works [11][12][13] and measured the detailed local heat transfer distributions under impingement of inline and staggered jet arrays.…”

“…They found that the crossflow and the exit flow direction significantly affect the heat transfer distributions on a target surface. The results of HanÕs group [11][12][13] were, however, limited to jet array of inline pattern and only one fixed jet-to-plate spacing was considered. Carcasci [14] experimentally investigated air impinging jets on a flat plate.…”

“…Detailed heat transfer distributions under arrays of jets impinging on a target plate with dimpled or film hole surfaces were investigated by Treuren et al [10] and Han and his colleagues [11][12][13] using a liquid crystal image technique. They found that the crossflow and the exit flow direction significantly affect the heat transfer distributions on a target surface.…”

Experimental study on the heat transfer under impinging elliptic jet array along a film hole surface using liquid crystal thermograph

“…Attempts have been made to optimize each method in order to obtain effective heat transfer with low pressure loss. Treuren et al [17], Rhee et al [18], Kanokjaruvijit and Martinez-botas [19] and Huang and his colleagues [20,21] investigated detailed heat transfer distributions under arrays of jet impinging on a target plate with dimpled or film hole surfaces. However, their studies only focused on the heat transfer under in-line arrays of jet impinging on a surface.…”

Experimental investigation of impingement heat transfer on a flat and dimpled plate with different crossflow schemes

“…They found that the Nusselt number increases with increasing surface curvature for impingement on a concave surface. Azad et al [5] measured an array of inline air jets impinging on dimpled target plates using a transient liquid crystal technique with three different spent air crossflow orientations, jet Reynolds numbers ranging from 4,850 to 18,300 and a jet-to-plate spacing H/d of 3. The dimple diameter is equal to the jet diameter (D d /d = 1) and the dimple depth t d /D d = 0.5.…”