Osborne Reynolds Apparatus adalah alat untuk mengamati jenis aliran fluida. Tujuan dari penelitian ini adalah untuk mengetahui jenis-jenis aliran fluida mulai dari aliran laminar, transisi, hingga turbulen. Aliran laminar adalah aliran dengan Reynolds Number < 2000, aliran transisi yaitu kisaran 2000-4000, sedangkan aliran turbulen memiliki Reynolds Number > 4000. Pada pembuatan alat uji aliran Osborne Reynolds Apparatus ini menggunakan pipa transparan berdiameter 14 mm dan menggunakan water flow sensor secara vertikal. Bilangan Reynolds berbanding lurus dengan bukaan debit air, dengan bilangan Reynolds yang semakin meningkat berdasarkan pada bukaan debit air. Dari data hasil percobaan tersebut berdasarkan bukaan debit air 0,26L/min; 0,39L/min; 0,52L/min; 0,65L/min; 1,03L/min; 1,16L/min; 1,29L/min; 1,42L/min; 2,06L/min; 2,19L/min; 2,32L/min; dan 2,45L/min didapat flowrate secara berurut yaitu 4,333 x 10−6m3/s; 6,5 x 10−6m3/s; 8,667 x 10−6m3/s; 1,083 x 10−5m3/s; 1,717 x 10−5m3/s; 1,933 x 10−5m3/s; 2,15 x 10−5m3/s; 2,367 x 10−5m3/s; 3,433 x 10−5m3/s; 3,65 x 10−5m3/s; 3,867 x 10−5m3/s; dan 4,083 x 10−5m3/s.

Kata Kunci: Osborne Reynolds Apparatus, Laminar, Transisi, Turbulen, Water Flow Sensor

Osborne Reynolds Apparatus is a tool for observing types of fluid flow. The objective of this study was to determine the types of fluid flow ranging from laminar, transitional, to turbulent flow. The laminar flow was a flow with Reynolds Number < 2000, the transitional flow was in the range of 2000-4000, while turbulent flow had Reynolds Number > 4000. In making the flow tester of Osborne Reynolds Apparatus, it was used a transparent pipe with a diameter of 14 mm and a water flow sensor vertically. When the Reynolds number was directly proportional to the water discharge opening, it was obtained the Reynolds number increased based on the water discharge opening. From the experimental data, based on the water discharge opening of 0,26L/min; 0,39L/min, 0,52L/min; 0,65L/min; 1,03L/min; 1,16L/min; 1.29L/min; 1,42L/min; 2,06L/min; 2,19L/min 2,32L/min; and 2,45L/min, were obtained the flowrate sequentially, namely: 4,333 x 10-6m3/s; 6,5 x 10-6m3/s; 8,667 x 10-6m3/s; 1,083 x 10-5m3/s; 1,717 x 10-5m3/s; 1.,933 x 10- 5m3/s; 2,15 x 10-5m3/s; 2,367 x 10-5m3/s; 3,433 x 10-5m3/s; 3,65 x 10-5m3/s; 3,867 x 10-5m3/s; dan 4,083 x 10-5m3/s. Keywords: Osborne Reynolds Apparatus, Laminar, Transition, Turbulence, Water Flow Sensor