The computational study discusses the application of the co-flow jet technique as a fluid flow control device on the NACA 0015 airfoil. The numerical equation used is the RANS equation with the k-ε turbulence model. There are three variations of the mesh proposed in this paper. The first variation is a fine mesh with 100,000 elements. The second variation is a medium mesh with 50,000 elements. Meanwhile, the third variation is coarse mesh with 25,000 elements. Based on the mesh independence test results, the mesh with the lowest error value is the fine mesh. Co-flow jet is proven to control fluid flow on the upper side of NACA 0015. Co-flow jet can also improve the aerodynamic performance of NACA 0015 by increasing Cl and decreasing Cd. The increase in Cl was 114% and the decrease in Cd was 24%. The fluid flow separation on the upper side of the airfoil can also be handled well by the co-flow jet.
UMKM di Indonesia berkembang sangat pesat dimana pada tahun 2015 berjumlah 59,7 juta UMKM. UMKM memberikan kontribusi sebesar 62,6% terhadap PDB dan menyerap tenaga kerja nasional sebesar 97%. Pertumbuhan ini disisi lain menuntut UMKM melakukan berbagai inovasi agar mampu bersaing dan salah satu cara yang dapat dilakukan adalah melakukan efisiensi biaya operasional. Biaya operasional yang memiliki kontribusi besar adalah biaya pemakaian daya listrik. Sebagai solusi akan dilakukan monitoring pemakaian daya listrik dengan bantuan teknologi IoT (Internet of Things). Monitoring daya listrik dengan mengamati kejadian yang bersifat anomali dijadikan acuan untuk melakukan penghematan. Penelitian ini diharapkan bisa menjadi solusi untuk melakukan efisiensi pemakaian daya listrik bagi pemilik UMKM agar memiliki daya saing tinggi. Pemakaian teknologi IoT menjadi keharusan mengingat kemampuannya dalam berbagai bidang
Issues in friction stir spot welding focus mainly on the mechanical characteristic affected by its Hardness. This Hardness must be maintained by evenly temperature distribution in weld zones during welding. The process parameters are mainly responsible for the development of the hardness of the friction stir spot weld. This study presented the hardness evaluations on the friction stir spot weld via the Hardness-Vickers test and analysis of the temperature distribution in the weld zones via the finite element method. The workpiece samples used in this study were Aluminium alloy 5052-H112 with a thickness of 2 millimeters in the lap-shear mode based on 3 main parameters at low and high levels of parameters configuration. The results obtained via the Hardness-Vickers tests exhibited a value of 42-HV located in the middle of the spot-weld center using a low-level parameters configuration. This value increased to 64-HV around the vicinity of the keyhole. And then the value decreased to 53-HV outside the keyhole, about 6 millimeters from the spot-weld center. Using high-level parameter configuration, the Hardness-Vickers value increased to 61-HV in the middle of the spot-weld center. The value then increased to 76-HV in the vicinity of the keyhole. Furthermore, the value decreased at 60-HV outside the keyhole, which ca 6 millimeters away from the spot-weld center. The temperature distribution of the weld zones achieved 480 oC in the vicinity of the keyhole using the low-level parameter configuration. Slowly, the temperature declined to 380 oC at 6 mm away from the friction spot-weld center in the HAZ. Using the high-level parameters configuration, the temperature distribution reached 540 oC in SZ, and slowly reduced to 425 oC in HAZ. Based on the results, it was found that by using high-level parameters configuration the hardness of the friction stirs spot weld exhibited better Hardness-Vickers value and evenly temperature distribution in the weld zones.
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