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  • Küçük Resim
    Öğe
    Experimental determination of cooling performance on heat sinks with cone-jet electrospray mode
    (Elsevier - Division Reed Elsevier India Pvt Ltd, 2021) Kabakuş, Absüssamed; Yakut, Kenan; Özakın, Ahmet Numan; Yakut, Rıdvan
    In this study, electrospray cooling characteristics for smooth surface heat sink and finned surface heat sink were investigated. An experimental study was carried out using ethanol for 7 different heat fluxes in the cone-jet mode, in which a stable and continuous droplet diameter is produced. In the experiments, 7 kV voltage, 20 mm nozzle-to-substrate distance, a stainless steel nozzle with 0.61 mm inner diameter (d(i)) and 0.45-0.60 ml/min flow rates were used. Due to that the two flow rate values are very close to each other, no difference in the formation of electrospray was observed, but since the amount of fluid sent to the heat sink is higher, at 0.60 ml/min flow rate, 15-44% better a cooling was achieved under different heat fluxes compared to 0.45 ml/min flow rate. In addition, finned heat sink applied for the first time in electrospray cooling provided approximately 1.3-1.6 times better cooling than smooth surface heat sink. The effect of electrospray dripping on cooling in a finned heat sink is expressed by enhancement ratio (ER). Additionally, the change in fin enhancement ratio (FER), which denotes the enhancement of cooling in finned heat sink in comparison to that in finless heat sink, was scrutinized at different surface temperatures. As a result, as a distinction from the studies on improving heat transfer with electrospray cooling, it was suggested that finned surface heat sinks, which were not used before, can be used as an effective parameter to further enhance the heat transfer.
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    Öğe
    Optimization of finned heat sinks with electrospray cooling: Full factorial method
    (Begell House Inc., 2024) Kabakuş, Abdüssamed; Yakut, Kenan
    In this study, the optimum heat sink geometry was determined by the full factorial method with electrospray cooling, which has started to find a place among the methods used for the removal of high heat flux in recent years. The experiments were carried out at 4.4 kV voltage, 0.2 mL/min flow rate, di = 0.61 mm nozzle diameter, and 20 mm nozzle-to-heat sink distance. Ethanol was used as the cooling fluid. The experiments were carried out in the cone jet electrospray mode. As a result of the experiments performed with square, rectangular, and triangular fin heat sinks, it was determined that the best cooling performance was achieved in the square fin heat sink. As a result of the experiments carried out with the square fin heat sink with 27 different geometries, it was determined that the most effective cooling was achieved in the Square-18 heat sink with 3 mm fin width, 3 mm fin distance, and 3 mm fin height. An average temperature value of 51? and a fin enhancement ratio of 1.11 were obtained for eight different heat fluxes (3.2–2.99–2.75–2.59–2.4–2.19–2.02–1.88 kW/m2) in the Square-18 heat sink.