Jet impingement heat transfer on dimpled target surfaces

Heat transfer enhancement on a flat surface with axisymmetric detached ribs by normal impingement of circular air jet

“…However, their data reflects the average Nusselt number variation rather than local data because of the large thickness of the target plate (brass plate of 10 mm thick) used. Ekkad and Kontrovitz (2002) have studied the effect of the dimpled surface on the heat transfer between array of circular jets and the flat plate. They have reported reduction in the heat transfer coefficient for the dimpled surface as compared to the smooth surface.…”

Numerical investigation of an axi-symmetric laminar jet impinging on a dimpled surface under uniform heat flux using a finite element method

“…Azad et al [5] found higher heat transfer results compared with those for flat plates for Re values between 4,850 and 18,300. Ekkad and Controvitz [6] reported that the presence of dimples resulted in a lower heat transfer for Re = 4,800-14,800. Kanokjaruvijit and MartinezBotas [7][8][9] showed enhanced heat transfer in the presence of dimples with strong crossflows for Re = 5,000-11,500.…”

“…Using the flat plate impingement results as baseline cases, dimple impingement was studied together with various parametric effects, such as Re, jet-to-plate spacing (H/D j ), dimple depth (d/D d ), and ratio of nozzle exit diameter to dimple projected diameter (D j /D d ). Due to the scarcity of information on heat transfer and flow of a laminar jet impinging onto a dimple, this study intends to provide computational data for better understanding of the experimental results found by previous researchers [5][6][7][8][9]. Fig.…”

Heat transfer augmentation between impinging circular air jet and flat plate using finned surfaces and vortex generators

“…However, their data reflects the average Nusselt number variation rather than local data because of the large thickness of the target plate (10 mm) used. Ekkad and Kontrovitz [17] have studied the effect of the dimpled surface on the heat transfer between array of circular jets and the flat plate. They have reported the reduction in the heat transfer coefficient for the dimpled surface as compared to the smooth surface.…”